ライフサイエンスコーパス: Hf

1 Hf(12) -Ru-Co efficiently catalyzed acceptorless dehydro

2 Hf(12)-Ir-OTf also competently catalyzed late-stage func

3 Hf(12)-Ir-OTf effectively catalyzed dehydrogenative cros

4 Hf-, Sn-, and Zr-Beta zeolites catalyze the cross-aldol

5 Hf-NU-1000-ZrBn is found to be a promising single-compon

6 )N)(3)M(mu-H)(mu-NMe(2))(2)](2)M (M = Zr, 1; Hf, 2) were observed to be intermediates and characteriz

7 Reactions of d0 amides M(NMe2)4 (M = Zr, 1; Hf, 2) with O2 have been found to yield unusual trinucle

8 g atomically coherent to HfN skins via (111)-Hf monolayers.

9 fined correlation between the Th/Hf and (176)Hf/(177)Hf ratios in chondrites that reflects remobiliza

10 ain with chondritic (143)Nd/(144)Nd and (176)Hf/(177)Hf shortly after Earth accretion.

11 zed by distinctly subchondritic initial (176)Hf/(177)Hf and (143)Nd/(144)Nd have u(182)W values consi

12 08,207,206)Pb/(204)Pb, (143)Nd/(144)Nd, (176)Hf/(177)Hf, and (230)Th/(232)Th.

13 arth formation yields a (143)Nd/(144)Nd-(176)Hf/(177)Hf composition within error of chondrite meteori

14 Evidence of (176)Hf excess in select meteorites older than 4556Ma was sug

15 The Hf isotopic ratios ((176)Hf/(177)Hf) of submarine lavas from the eastern Lau spre

16 istinctly subchondritic initial (176)Hf/(177)Hf and (143)Nd/(144)Nd have u(182)W values consistent wi

17 mation yields a (143)Nd/(144)Nd-(176)Hf/(177)Hf composition within error of chondrite meteorites, whi

18 rrelation between the Th/Hf and (176)Hf/(177)Hf ratios in chondrites that reflects remobilization of

19 chondritic (143)Nd/(144)Nd and (176)Hf/(177)Hf shortly after Earth accretion.

20 The Hf isotopic ratios ((176)Hf/(177)Hf) of submarine lavas from the eastern Lau spreading ce

21 06)Pb/(204)Pb, (143)Nd/(144)Nd, (176)Hf/(177)Hf, and (230)Th/(232)Th.

22 hese distinct reactive oxygen species, W(18)@Hf(12)-DBB-Ir elicited superb anticancer efficacy with >

23 Upon X-ray irradiation, W(18)@Hf(12)-DBB-Ir significantly enhances hydroxyl radical ge

24 Here we report the synthesis of W(18)@Hf(12)-DBB-Ir, a new nMOF assembly hierarchically incorp

25 W(18)O(62)](6-) (W(18)) POMs to afford W(18)@Hf(12)-DBB-Ir.

26 actions define distinct initial (182)Hf/(180)Hf corresponding to a 13.8 +/- 5.3 million year apparent

27 scopy between Stark-Zeeman sublevels in (180)Hf(19)F(+) with a coherence time of 100 milliseconds.

28 (182)Hf-(182)W chronometry of terrestrial rocks points to acc

29 Accurate (182)Hf-(182)W chronology of early planetary differentiation

30 lization of the lunar magma ocean after (182)Hf was no longer extant-that is, more than about 60 mill

31 adioisotopes (e.g., (26)Al, (41)Ca, and (182)Hf) synthesized in one or multiple stars and added to th

32 vertheless, some N-body simulations and (182)Hf-(182)W and (87)Rb-(87)Sr chronology of some lunar roc

33 The decoupling between (182)Hf and (26)Al requires distinct stellar origins: steady-

34 resulting from the decay of now-extinct (182)Hf, among five magmatic iron meteorite groups.

35 particular, the abundances inferred for (182)Hf (half-life = 8.9 million years) and (129)I (half-life

36 te galactic stellar nucleosynthesis for (182)Hf and late-stage contamination of the protosolar molecu

37 metal fractions define distinct initial (182)Hf/(180)Hf corresponding to a 13.8 +/- 5.3 million year

38 asymptotic giant branch stars produces (182)Hf.

39 In contrast, our results support (182)Hf homogeneity and chronological significance of the (18

40 on of the hafnium-tungsten systematics ((182)Hf decaying to (182)W and emitting two electrons with a

41 Using the (182)Hf-(182)W chronometer, we show that a FUN CAI recording

42 y and chronological significance of the (182)Hf-(182)W clock.

43 le, which can be investigated using the (182)Hf-(182)W decay system in shergottite-nakhlite-chassigni

44 The (182)Hf-(182)W system provides a powerful complement to the (

45 ture of homometal clusters) assemble, and 2) Hf-rich OM(4) selectively precipitates over Zr-rich OM(4

46 by reduction of the bisazide trans-[(PN)(2) Hf(N(3) )(2) ] (1) with two equiv of KC(8) .

47 gen ligand, [(eta(5)-C(5)H(2)-1,2,4-Me(3))(2)Hf](2)(mu(2),eta(2),eta(2)-N(2)), by addition of CySiH(3

48 f (C(5)H(5))(2)Zr(CH(3))(2) or (C(5)Me(5))(2)Hf(CH(3))(2) with diphenyldiazomethane is limited to the

49 ted hafnocene product, (eta(5)-C(5)Me(4)H)(2)Hf(OTf)(N(2)(CH(3))) provides a platform for additional

50 yl diazenide compound, (eta(5)-C(5)Me(4)H)(2)Hf(OTf)(N(2)(CH(3))), arising from methylation of one of

51 the hafnocene complex [(eta(5)-C(5)Me(4)H)(2)Hf](2)(mu(2),eta(2),eta(2)-N(2)) underwent clean carbony

52 nd dinitrogen ligand, [(eta(5)-C(5)Me(4)H)(2)Hf](2)(mu(2),eta(2),eta(2)-N(2)), with two equivalents o

53 functionalization in [(eta(5)-C(5)Me(4)H)(2)Hf](2)(N(2)C(2)O(2)) was also accomplished with silanes

54 e oxamidide ligand in [(eta(5)-C(5)Me(4)H)(2)Hf](2)(N(2)C(2)O(2)) was explored due to the high symmet

55 (2)(N(2)C(2)O(2)) and [(eta(5)-C(5)Me(4)H)(2)Hf](2)(N(2)C(2)O(2)), prepared from CO-induced N(2) bond

56 for (C(5)Me(5))(2)MCl(2) (M = Ti, 1; Zr, 2; Hf, 3; Th, 4; U, 5), where we can directly compare a cla

57 exemplarily demonstrated for the Zr(20)Cu(20)Hf(20)Ti(20)Ni(20) BMG.

58 s and have one hydroxyl group, i.e, ( SiO)(3)Hf-OH.

59 e2)6(mu-NMe2)3(mu3-O)(mu3-ONMe2) (M = Zr, 3; Hf, 4) in high yields.

60 O(10) (OH)(26) (SO(4) )(13) .(H(2) O)(33) ] (Hf(18) ), which is centred by the same hexamer motif fou

61 d fascinating MOFs when combined with Zr(4+)/Hf(4+) and rare-earth metal cations (RE) with improved g

62 oup 4 difluorides (Cp2MF2, M = Ti 4a, Zr 5a, Hf 6a; Cp*2MF2, M = Ti 4b, Zr 5b, Hf 6b) are reported.

63 4a, Zr 5a, Hf 6a; Cp*2MF2, M = Ti 4b, Zr 5b, Hf 6b) are reported.

64 2-MIL-125(Ti), NH2-UiO-66(Zr) and NH2-UiO-66(Hf) are among the most studied MOFs for photocatalytic a

65 y image defect nanodomains in the MOF UiO-66(Hf) over an area of ca. 1000 nm and with a spatial resol

66 report a hafnium-containing MOF, hcp UiO-67(Hf), which is a ligand-deficient layered analogue of the

67 alogue of the face-centered cubic fcu UiO-67(Hf).

68 8)V*, Ni(8)W, Pd(8)Al(dagger), Pd(8)Fe, Pd(8)Hf, Pd(8)Mn, Pd(8)Mo*, Pd(8)Nb, Pd(8)Sc, Pd(8)Ta, Pd(8)T

69 Zn, Pd(8)Zr, Pt(8)Al(dagger), Pt(8)Cr*, Pt(8)Hf, Pt(8)Mn, Pt(8)Mo, Pt(8)Nb, Pt(8)Rh(dagger), Pt(8)Sc,

70 Herein, we report surface modification of a Hf-DBP nMOF for the co-delivery of a hydrophobic small-m

71 Here we report the rational design of a Hf-porphyrin nanoscale metal-organic framework, DBP-UiO,

72 By grafting 5-aminolevulinic acid (ALA) to a Hf(12) -based nanoscale metal-organic layer (Hf-MOL) via

73 Hf(12) clusters, Hf-Ir-OTf uses Lewis acidic Hf sites to bind and activate electron-deficient alkenes

74 ikely mechanism is hydration of the adsorbed Hf complex up to a coordination number of 7, followed by

75 r (Hf-MOL) via carboxylate coordination, ALA/Hf-MOL enhanced ALA delivery and protoporphyrin IX (PpIX

76 Recently, amorphous Hf-B-Si-C-N coatings found to demonstrate superior high-

77 ntegral alkyne units in a pair of Zr(4+) and Hf(4+) MOFs, which proceeds stereoselectively in a singl

78 two coatings, Hf(7)B(23)Si(22)C(6)N(40) and Hf(6)B(21)Si(19)C(4)N(47), annealed to 1500 degrees C in

79 ch as (t)BuNCO and CO(2) to form new N-C and Hf-O bonds.

80 the 40 elements: Ta, U, Ir, Rh, Th, Ce, and Hf showed the lowest Dmin values, </=10 nm; Bi, W, In, P

81 paper, we prepared nanoparticles of HfN and Hf(2) ON(2) and tested them for the OER for the first ti

82 tentative correlation between S isotopes and Hf-W core segregation ages suggests that the two systems

83 oselectivity is observed, whereby Zr(IV) and Hf(IV) principally direct P-OR hydrolysis, whereas Th(IV

84 dimeric structure in the cases of Zr(IV) and Hf(IV).

85 y accelerated by Ce(IV), Th(IV), Zr(IV), and Hf(IV) cations.

86 been used to decouple the effects of LiF and Hf(4+).

87 discrepancy between the U-Pb (60-80 Myr) and Hf-W clocks (30 Myr) in determining the timescale of Ear

88 Extrapolation of the Nd and Hf isotopic compositions of the kimberlite source to the

89 y employing a compilation of the Sr, Nd, and Hf isotope composition of kimberlites-volcanic rocks tha

90 5-15.6) and relatively invariant Sr, Nd, and Hf isotopes, the data suggest that this source must be l

91 The Pb, Sr, Nd, and Hf isotopic mixing arrays show that the Archean EM I mat

92 requiring the separation of Sr, Pb, Nd, and Hf only.

93 a [Ru(DBB)(bpy)(2) ](2+) photosensitizer and Hf(12) SBU capped with triflate as strong Lewis acids an

94 by addition of CySiH(3) resulted in N-Si and Hf-H bond formation and a compound poised for subsequent

95 , B, Na, Ga, Rb, Sr, Zr, Nb, Cs, Ba, Sm, and Hf, allows more than 80% of correct predictions in leave

96 ically unsaturated diene complexes of Ti and Hf.

97 r and Pb, LREE then La-Ce-Nd-Sm, Lu(Yb), and Hf, Th, and U, respectively) along with an additional, i

98 crystallographic analysis reveals the Zr and Hf complexes to be closely isostructural; the bond lengt

99 The high atomic number of Zr and Hf in the SBUs serves as effective X-ray antenna by abso

100 sis of a series of 14 interpenetrated Zr and Hf MOFs linked by functionalized 4,4'-[1,4-phenylene-bis

101 similar topological MOF structures to Zr and Hf since its first discovery in 2015.

102 i system is distinct from that of the Zr and Hf systems.

103 e of UiO materials, the d-orbitals of Zr and Hf, are too low in binding energy and thus cannot overla

104 In addition, the WB4 alloys with Ti, Zr, and Hf showed a substantially increased oxidation resistance

105 d, length as m-dash]C), with M = Ti, Zr, and Hf were selected as examples for considerations of equil

106 s show that when group IV (i.e., Ti, Zr, and Hf) or V (i.e., Nb and Ta) transition metals are substit

107 number, in the order Ti > Zr approximately = Hf, and that uranium displays approximately half the cov

108 oys with 8 at. % Ti, 8 at. % Zr, and 6 at. % Hf gave hardness values, Hv, of 50.9 +/- 2.2, 55.9 +/- 2

109 The high-pressure reaction between Hf and N(2) also leads to a non-centrosymmetric polynitr

110 s application to poorly characterized binary Hf systems, believed to be phase-separating, defines thr

111 occur, and hetero-pairs Sb(2)Te(2)Se/BiTeCl, Hf(2)N(2)I(2)/Zr(2)N(2)Cl(2), and LiAlTe(2)/BiTeI emerge

112 old-plastic forming of the typically brittle Hf-based bulk amorphous alloy through controlling homoge

113 Si(eta(5)-C(5)Me(4))(eta(5)-C(5)H(3)-3-(t)Bu)Hf(I)(NCO), demonstrating that C-C bond formation is rev

114 2)Si(eta(5)-C(5)Me(4))(eta(5)-C(5)H(3)-(t)Bu)Hf](2)(mu(2), eta(2), eta(2)-N(2)), yields the correspon

115 Si(eta(5)-C(5)Me(4))(eta(5)-C(5)H(3)-3-(t)Bu)Hf](2)(N(2)C(2)O(2)) and [(eta(5)-C(5)Me(4)H)(2)Hf](2)(N

116 Si(eta(5)-C(5)Me(4))(eta(5)-C(5)H(3)-3-(t)Bu)Hf](2)(N(2)C(2)O(2)) with I(2) yielded the monomeric iod

117 Si(eta(5)-C(5)Me(4))(eta(5)-C(5)H(3)-3-(t)Bu)Hf](2)(N(2)C(2)O(2)), undergoes facile cycloaddition wit

118 ter 54 h in air at 530 degrees C achieved by Hf addition onto LSC.

119 Better by Hf: Anion coordination to a bridging hafnocene nitride c

120 llylic and homoallylic alcohols catalyzed by Hf(IV)-bishydroxamic acid (BHA) complexes is described.

121 d homoallylic amine derivatives catalyzed by Hf(IV)-bishydroxamic acid complexes is described.

122 12)-Ir-OTf, comprising triflate (OTf)-capped Hf(12) secondary building units (SBUs) and photosensitiz

123 As a multifunctional catalyst, Hf-NU-1000 is also efficient for other epoxide activatio

124 Cationic Hf(12)-DBB-Ir was built from Hf(12) secondary building u

125 The hafnium analogue of 1, Cp*(Cl)Hf(2,3-dimethylbutadiene) (14), has been reported to giv

126 ort that discrete hafnium metal-oxo cluster [Hf(18) O(10) (OH)(26) (SO(4) )(13) .(H(2) O)(33) ] (Hf(1

127 zers (Ir-PSs) and triflated Hf(12) clusters, Hf-Ir-OTf uses Lewis acidic Hf sites to bind and activat

128 he microstructure evolution of two coatings, Hf(7)B(23)Si(22)C(6)N(40) and Hf(6)B(21)Si(19)C(4)N(47),

129 ically incorporating three high-Z components-Hf-based metal-oxo clusters, Ir-based bridging ligands,

130 Considering Hf(0.5)Zr(0.5)O(2) as the ferroelectric material, we stu

131 ure analysis reveals A to possess a covalent Hf=N triple bond and of super-basic character.

132 of the mixed-ring silyl methyl complex CpCp*Hf[Si(SiMe3)3]Me (4) with B(C6F5)3 in bromobenzene-d5 yi

133 Reactions of CpCp*Hf(SiR3)Me (SiR3 = SitBuPh2, SiHMes2) with B(C6F5)3 rapi

134 ary ligand, with the stabilities of the CpCp*Hf(SnPh(3))X compounds following the order X = NMe(2) >

135 p orbital mixing is enhanced for the diffuse Hf (5d) and Zr (4d) atomic orbitals in relation to the m

136 e orogenic processes which may have distinct Hf-Nd isotopic signatures.

137 how that both VFR and ELSC have the distinct Hf-Nd isotope composition of the so-called DUPAL isotopi

138 ies (<10(-6) A/cm(2) at +/-2 V) and enhances Hf-SAND multilayer capacitance densities to nearly 1 muF

139 For example, Hf(OTf)4 mediates rapid endothermic ether right harpoon

140 rders of 0.66 +/- 0.09 and 0.48 +/- 0.07 for Hf and Zr, respectively; at higher [H(2)], the rates app

141 . % for Ti, 10 at. % for Zr, and 8 at. % for Hf.

142 ion and silicate differentiation fractionate Hf from W.

143 rein a new Hf-based metal-organic framework (Hf-NU-1000) incorporating Hf6 clusters is reported.

144 mesoporous Hf-based metal-organic framework (Hf-NU-1000) is employed as a well-defined scaffold for a

145 step synthesis of metal-inorganic frameworks Hf(4) N(20) .N(2) , WN(8) .N(2) , and Os(5) N(28) .3 N(2

146 The porous frameworks (Hf(4) N(20) , WN(8) , and Os(5) N(28) ) are built from t

147 Cationic Hf(12)-DBB-Ir was built from Hf(12) secondary building units (SBUs) and [Ir(bpy)(2)(p

148 ly enhances hydroxyl radical generation from Hf(12) SBUs, singlet oxygen generation from DBB-Ir ligan

149 ystem is much slower than that obtained from Hf-W systematics, and implies substantial accretion afte

150 titanium (Ti), zirconium (Zr), and hafnium (Hf), of different concentrations (0-50 at.

151 Among the large family of MOFs, hafnium (Hf) based MOFs have been demonstrated to be highly promi

152 om the ancient city of Gerasa, that hafnium (Hf) isotopes are different in Egyptian and Levantine nat

153 locked the plutonic archive through hafnium (Hf) and oxygen (O) isotope analysis of zoned zircon crys

154 Heavy Hf atoms in the SBUs efficiently absorb X-rays and trans

155 ands, enhanced intersystem crossing by heavy Hf centers, and facile (1)O2 diffusion through porous DB

156 Upon X-ray irradiation, IMD@Hf-DBP/alphaCD47 effectively modulates the immunosuppres

157 tween photoredox and Lewis acid catalysts in Hf(12)-Ir-OTf, which not only facilitates the reaction b

158 We attribute the striking difference in Hf isotopes of Egyptian versus Levantine glasses to sort

159 ) is different from that previously found in Hf(2) N(11) and because N(18) macrocycles have never bee

160 rption spectra of a two-fold interpenetrated Hf MOF, linked by 1,4-phenylene-bis(4-ethynylbenzoate) l

161 n (DBP) ligands, QP-SN was incorporated into Hf-DBP nMOF to afford a novel multifunctional mixed-liga

162 indicate that activity arises from isolated Hf(IV) atoms with monofunctional acidic properties.

163 Hf(12) -based nanoscale metal-organic layer (Hf-MOL) via carboxylate coordination, ALA/Hf-MOL enhance

164 entration of 0.7 mg mL(-1) ) of thin-layered Hf-MOLs compared to their 3D counterparts, thereby verif

165 afford a novel multifunctional mixed-ligand Hf-DBP-QP-SN nMOF with good biocompatibility.

166 ,4-phenylene-bis(4-ethynylbenzoate) ligands (Hf-peb), are induced by rotation of the central phenyl r

167 bpy)3 ](2+) -derived tricarboxylate ligands (Hf-BPY-Ir or Hf-BPY-Ru; bpy=2,2'-bipyridine, ppy=2-pheny

168 Low Hf concentration films feature an aged surface of larger

169 U-Pb and Lu-Hf isotope analyses of zircons were made using ion probe

170 Here, we combined Lu-Hf isotopes and U-Pb geochronology to map the four-dimen

171 Lutetium-hafnium (Lu-Hf) isotope data for ALH indicate an igneous age of 4.09

172 esent an integrated zircon isotope (U-Pb, Lu-Hf, O) and trace element dataset from the paired Cu-Au (

173 The calculated Lu/Hf and Sm/Nd (samarium/neodymium) ratios of the ALH pare

174 from M6(mu3-O)4(mu3-OH)4(carboxylate)12 (M = Hf or Zr) secondary building units (SBUs) and anthracene

175 n-Bu, i-Bu, and 2-ethylbutyl (5a-f) and M = Hf; R = i-Bu and t-Bu (6 and 7, respectively)] is descri

176 This work suggests that MNiSn (M = Hf, Zr, Ti) and perhaps most other half-Heusler thermoel

177 (3)-N-N=CPh(2)](CH(3)) (M = Zr, R = H or M = Hf, R = CH(3)).

178 This new material Hf-NU-1000-ZrBn is fully characterized by a variety of s

179 A structurally well-defined mesoporous Hf-based metal-organic framework (Hf-NU-1000) is employe

180 eed reveal some residual intragrain metallic Hf.

181 ed compounds (M = Sc, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta) with F-, H-, O-, and OH-functionalized surfaces

182 of a bifunctional metal-organic layer (MOL), Hf(12) -Ru-Co, composed of [Ru(DBB)(bpy)(2) ](2+) [DBB-R

183 w multifunctional metal-organic layer (MOL), Hf(12)-Ir-OTf, comprising triflate (OTf)-capped Hf(12) s

184 Here we report the clay-sized (<2 mum) Hf-Nd isotope data from Asian dust sources to better con

185 ](2-MeO[bond]C(6)H(4))(2,4,6-Me(3)C(6)H(2))N]Hf(CH(2)Ph) (3) (1), which is capable of polymerizing 1-

186 oxide-organic self-assembled nanodielectric (Hf-SAND) material consisting of regular, alternating pi-

187 y discovered body-centered cubic (BCC) Ta-Nb-Hf-Zr-Ti high-entropy alloy superconductor appears to di

188 ava units change towards less radiogenic Nd, Hf, and Pb isotope ratios.

189 compositions of lithophile elements (Sr, Nd, Hf) in these lavas require derivation from a mantle sour

190 with anomalous (182)W and examine how Sr-Nd-Hf-Pb isotopic variations-useful for tracing subducted,

191 d zircons, together with the unradiogenic Nd-Hf isotope of the host quartz diorite, appears to sugges

192 New Hf isotope data provide new insights into the nature of

193 Herein a new Hf-based metal-organic framework (Hf-NU-1000) incorporat

194 o the results from previous studies, the new Hf analyses combined with previous Nd isotope data clear

195 reconstructions and ground-truthed with new Hf-Nd isotope data, suggest that uppermost mantle at one

196 The fabricated bulk high-entropy nitride (Hf(0.2)Nb(0.2)Ta(0.2)Ti(0.2)Zr(0.2))N demonstrates outst

197 ore a comprehensive data set of isotopic (O, Hf) and chemical proxies in precisely U-Pb dated zircon

198 vity is likely derived from the actuation of Hf(IV) Lewis acidic sites and the Bronsted acidic surfac

199 S is unable to detect significant amounts of Hf in the A15 structure, APT does indeed reveal some res

200 s-tert-butyl phenyl substituted complexes of Hf and Zr, when activated by MAO at 50-80 degrees C, gen

201 f the molecular weight distribution (MWD) of Hf-bound polymers via UV-GPC analysis.

202 The superior catalytic performance of Hf(12)-Ir-OTf over a mixture of photoredox catalyst and

203 rm is produced by solution phase reaction of Hf(NEtMe)4 with ammonia followed by low-temperature pyro

204 dic sites and the Bronsted acidic surface of Hf(18) .

205 sed for deprotonation of YHf and transfer of Hf+ against the thermodynamic potential.

206 We propose that the transfer of Hf+ from formate to the active site base Y- is thermodyn

207 tion at the Hf center, and chain transfer of Hf-bound polymers to ZnEt2 is fast and quasi-irreversibl

208 Our work illustrates the value of Hf isotopes in provenancing archaeological glass.

209 Large-area devices (>0.2 mm(2)) on Hf-SAND (6.5 nm thick) achieve mA on currents at ultralo

210 Based on Hf-W chronometry on Allende chondrules and matrix, this

211 mbient (400 degrees C) has limited impact on Hf-SAND leakage densities (<10(-6) A/cm(2) at +/-2 V) an

212 derived tricarboxylate ligands (Hf-BPY-Ir or Hf-BPY-Ru; bpy=2,2'-bipyridine, ppy=2-phenylpyridine) an

213 Combining stoichiometric amounts of Zr or Hf precursors with organic linkers at high concentration

214 plexes [Cp*2MCH3](+)[B(C6F5)4](-) (M = Zr or Hf) with trimethylsilyl(diarylphosphino)acetylenes Ar2P-

215 organic frameworks (MOFs), M-MTBC (M = Zr or Hf), constructed from the tetrahedral linker methane-tet

216 O molar ratio for reactions containing Zr or Hf, and predicts that formation of the Ti-NCS compound r

217 oxide complexes [(PNP)M(CH3)2(OAr)] (M=Zr or Hf; PNP(-)=N[2-P(CHMe2)2-4-methylphenyl]2); Ar=2,6-iPr2C

218 its (space groups: Ti-CS (Pnma), Zr-CS (P1), Hf-CS (P2/n)).

219 Here we present new Sr-Nd-Pb-Hf isotope data from the older parts of this hotspot tra

220 containing the parent imido ligand [(PN)(PNC)Hf=NH{mu(2) -K}](2) (2) (PN(-) =(N-(2-P(i) Pr(2) -4-meth

221 o leads to a non-centrosymmetric polynitride Hf(2) N(11) that features double-helix catena-poly[tetra

222 ns and their host oxide gabbro have positive Hf isotope compositions (epsilonHf = +15.7-+12.4), sugge

223 We extended this strategy to prepare Hf(12) -Ru-Co-OTf MOL with a [Ru(DBB)(bpy)(2) ](2+) phot

224 educed Mo(IV) state with the formate proton, Hf+, transferring to a nearby base Y-.

225 t ELSC lavas have a slightly more radiogenic Hf isotopic composition than VFR lavas.

226 how that there is a more positive radiogenic Hf isotopic composition with clay-sized fractions than t

227 As a result, Hf-TP-SN plus radiation induces significant cytotoxicity

228 In the halichondrin C series, Hf(OTf)4 was used to convert the double oxy-Michael prod

229 aviour of grains of a spark-plasma sintered (Hf-Ta-Zr-Nb)C high-entropy carbide in a specific orienta

230 With three synergistic active sites, Hf(12) -Ru-Co-OTf competently catalyzed dehydrogenative

231 The sizable Hf-SAND capacitances are attributed to relatively large

232 The clay-sized Hf-Nd isotopic compositions of the desert samples from t

233 sed by a heterogeneous reaction of the solid Hf(18) cluster, and not from smaller, soluble Hf species

234 f(18) cluster, and not from smaller, soluble Hf species that could leach into solution.

235 lso exists in MC-ICPMS, e.g., Nd, Ce, W, Sr, Hf, Ge, Hg, and Pb isotopes, the nature of mass bias for

236 H interaction and formation of a stabilizing Hf-arene interaction.

237 anoscale metal-organic framework (nMOF), TBC-Hf, and a small-molecule immunotherapy agent that inhibi

238 arbon nanotube transistors were used to test Hf-SAND utility in electronics and afforded record on-st

239 nd a well-defined correlation between the Th/Hf and (176)Hf/(177)Hf ratios in chondrites that reflect

240 l and DFT mechanistic analyses indicate that Hf(OTf)(4) catalyzes a mildly exergonic retro-hydroalkox

241 X-ray scattering and ESI-MS revealed that Hf(18) is completely insoluble in these conditions, conf

242 Herein we show that Hf-containing zeolites are unique catalysts for this rea

243 S NMR, and UV-vis spectroscopy suggests that Hf atoms are bonded to the support via three O atoms and

244 It was revealed that (Hf-Ta-Zr-Nb)C had a significantly enhanced yield and fai

245 The Hf isotopic ratios ((176)Hf/(177)Hf) of submarine lavas

246 The Hf-Nd isotopic compositions of dust in the North Pacific

247 the C-C bond of a cyclopropane ring and the Hf.

248 not influence the rate of propagation at the Hf center, and chain transfer of Hf-bound polymers to Zn

249 l similarity of the Hf and Zr complexes, the Hf complexes generate more highly stereoselective cataly

250 Using this relationship, we estimate the Hf/W ratio in Mars' mantle to be 3.51 +/- 0.45.

251 ggests optimal activation conditions for the Hf pre-catalyst in the presence of the activator [Ph3C][

252 The bottom layer in the Hf(6)B(21)Si(19)C(4)N(47) coating remains amorphous afte

253 riers than corresponding insertions into the Hf-alkyl bond.

254 culations show that such insertions into the Hf-aryl bond have lower barriers than corresponding inse

255 e driving forces for this insertion into the Hf-aryl bond include elimination of an eclipsing H-H int

256 thyl, consistent with 1,2-insertion into the Hf-aryl bond.

257 itially undergoes monomer insertion into the Hf-naphthyl bond, which permanently modifies the ligand

258 Despite the structural similarity of the Hf and Zr complexes, the Hf complexes generate more high

259 n of Cl upon increase in coordination of the Hf atom of the precursor.

260 osely isostructural; the bond lengths of the Hf complex are slightly shorter, but the maximum deviati

261 By leveraging the high-Z properties of the Hf(6) SBUs, the MOF enhances the therapeutic effect of X

262 ed, demonstrating the flexible nature of the Hf(IV)-BHA system.

263 sponding bulk sample and a decoupling of the Hf-Nd couplets in the clay formation during the weatheri

264 yoxime; PPA=4-pyridinepropionic acid) on the Hf(12) secondary building unit (SBU) as a hydrogen-trans

265 We suggest that the Hf-W timescale reflects the principal phase of core-form

266 ) synthesis in mitochondria, and trapped the Hf-MOL comprising 5,15-di-p-benzoatoporphyrin (DBP) phot

267 g to a large uncertainty associated with the Hf/W ratio of the Martian mantle and as a result, contra

268 These Hf-SAND multilayers are grown from solution in ambient w

269 Thus, Hf-bound polymeryls are selectively labeled in the prese

270 is observed that the Ni interstitial and Ti,Hf/Sn antisite defects are collectively formed, leading

271 Moving down the periodic table (Ti to Hf) has a marked effect on the experimental transition i

272 ased photosensitizers (Ir-PSs) and triflated Hf(12) clusters, Hf-Ir-OTf uses Lewis acidic Hf sites to

273 ting remains amorphous after annealing while Hf(7)B(23)Si(22)C(6)N(40) recrystallized partially showi

274 Combined with Hf isotopic ratios and trace element concentrations, the

275 Variations in zircon Hf and U/Yb reaffirm that tin belt magmas contain greate

276 ctive metal complexes M(CH(2)Ph)(4) (M = Zr, Hf) and multiple activation conditions represent a new h

277 orks (MOFs), NU-1000 and UiO-66, for M = Zr, Hf.

278 3-ONa)4H6](6-) nodes in M(III)H-BTC (M = Zr, Hf; BTC is 1,3,5-benzenetricarboxylate) via bimetallic r

279 articular, the resulting M-flu-SO(2) (M: Zr, Hf) materials display a new type of the augmented flu-a

280 afnium polyazides [PPh4 ]2 [M(N3 )6 ] (M=Zr, Hf) were obtained in near quantitative yields from the c

281 carbon covalence in (C5H5)2MCl2 (M = Ti, Zr, Hf) has been evaluated using carbon K-edge X-ray absorpt

282 of oxygen-functionalized M2CO2 (M = Ti, Zr, Hf) MXenes are investigated using first-principles calcu

283 In each (CuO, MO(2))/bpy/HF(aq) (M = Ti, Zr, Hf) system, the polar noncentrosymmetric racemate (M-NCS

284 M(NMe(2))(4) (M = Ti, Zr, Hf) were found to react with H(2)SiR'Ph (R' = H, Me, Ph)

285 [M(N3 )5 ](-) and [M(N3 )6 ](2-) (M=Ti, Zr, Hf) were studied by quantum chemical calculations at the

286 emical formula Mg(x) TM (1-x)N (TM = Ti, Zr, Hf, Nb).

287 r)]}(2)(mu-N(2)) compounds where M = Ti, Zr, Hf, Ta, Mo, and W.

288 c structures of O(h)-MCl(6)(2-) (M = Ti, Zr, Hf, U) and C(4v)-UOCl(5)(-), and to determine the relati

289 actinide hexahalides, MCl6(2-) (M = Ti, Zr, Hf, U).

290 (2)(H(2)O)](2)[MF(6)](2).3H(2)O (M = Ti, Zr, Hf; bpy = 2,2'-bipyridine) family (space group: Pna2(1))

291 xes {PhB(C5H4)(Ox(R))2}M(NMe2)2 (M = Ti, Zr, Hf; Ox(R) = 4,4-dimethyl-2-oxazoline, 4S-isopropyl-5,5-d

292 large family of materials (WHM with W = Zr, Hf; H = Si, Ge, Sn; M = O, S, Se, Te) with identical ban

293 l space of these borides with M = Sc, Y, Zr, Hf, and Nb, realizing an increased property tuning poten

294 Similar to the (Zr,Hf)NiSn based solid solutions, the unsubstituted ZrNiSn

295 Zr/Hf aqueous-acid clusters are relevant to inorganic nanol

296 xocation is the ubiquitous square aqueous Zr/Hf-oxysalt of all halides (except fluoride), and prior-d

297 que structural diversity existing between Zr/Hf and RE-based MOFs that demonstrates the crucial role

298 oxo/hydroxyl polyhedra and is the largest Zr/Hf cluster topology identified to date.

299 They are the first examples of Zr/Hf MOFs with tetrahedral linkers.

300 stitution of the 8-connected nodes by the Zr/Hf clusters yielded MOFs with large octahedral interstit