ライフサイエンスコーパス: actinide

1 r potential denticity (e.g., lanthanides and actinides).

2 learly located in the first shell around the actinide.

3 lanthanides, this report is the first for an actinide.

4 ghly ionic, lanthanide-like bonding for late actinides.

5 ost no direct measures of such covalency for actinides.

6 even stable, superheavy elements beyond the actinides.

7 ies of waste forms for the immobilization of actinides.

8 al bonding, and therefore the reactivity, of actinides.

9 the geochemical sequestration of radiotoxic actinides.

10 interactions become more prominent for heavy actinides.

11 ioactive waste and of the recycling of minor actinides.

12 ] shell directly in the HERFD-XAS spectra of actinides.

13 signifier of the presence of alpha emitting actinides, (2) an indicator of sample splitting, and (3)

14 X-ray scattering (RIXS) measurements at the actinide 5d edges on Fe foils exposed to uranium(VI) and

15 vel of localization and participation of the actinide 5f valence orbitals in covalent bonds across th

16 tinction between the lanthanide (4f) and the actinide (5f) transition elements is the increased role

17 ng molecules are examples of the long-sought actinide-alkylidynes.

18 The complexes of trivalent actinide (Am(III) and Cm(III)) and lanthanide (Nd(III) a

19 extraction selectivities for trivalent minor actinides (Am and Cm) in the presence of trivalent lanth

20 Advancing our understanding of the minor actinides (Am, Cm) versus lanthanides is key for develop

21 species obtained with neighbouring trivalent actinides americium, curium and californium (Cf).

22 ntal understanding of mechanisms involved in actinide (An) integration inside extended structures.

23 t years, analogous complexes involving other actinides (An) remain scarce.

24 an analogue for Pu(IV) and other tetravalent actinides [An(IV)], in saturated columns packed with a n

25 x with the first unsupported bond between an actinide and a group 13 element, (CpSiMe3)3U-AlCp* (Cp*

26 Here we report oxidation state reduction of actinide and analogue elements caused by high-energy, he

27 f Orbital bonding in actinide and lanthanide complexes is critical to their b

28 ecause it has an extremely high affinity for actinides and a low affinity for most common ions and is

29 plexes of early and later transition metals, actinides and group 1 metals are discussed, along with C

30 results imply diverse reactivity for the +3 actinides and highlight the unexpected and unique Ac(III

31 uel reprocessing, separating trivalent minor actinides and lanthanide fission products is extremely c

32 Worldwide stocks of actinides and lanthanide fission products produced throu

33 ge resin Diphonix which selectively collects actinides and lanthanides into a common form, which then

34 Some key chemical differences between actinides and lanthanides-and between different actinide

35 rocycles), with a focus on the separation of actinides and lanthanides.

36 ce could encompass mid-range oxidation state actinides and lanthanides.

37 n implicated in influencing the transport of actinides and other adsorbed contaminants in the subsurf

38 d radiation tolerance of potential hosts for actinides and radioactive wastes to be tailored.

39 y and non-Fermi-liquid behaviour observed in actinide- and lanthanide-based compounds.

40 in in a column mode at a pH approximately 1, actinides are completely eluted with 0.5 M 1-hydroxyethy

41 familiar transition-metals and the emerging actinides, as well as fostering communication and collab

42 rometry (AMS) for the determination of minor actinides at the levels of attogram/liter in urine sampl

43 due to preparation of the first examples of actinide-based frameworks with "unsaturated" metal nodes

44 er (BET) surface area (2100 m(2) g(-1) ) for actinide-based MOFs has been obtained.

45 overning the partitioning of lanthanides and actinides between an aqueous phase containing a polyamin

46 erdeveloped area for the study of nonaqueous actinide bonding and reactivity.

47 p(IV)-silica colloids, the actinide--oxygen--actinide bonds are increasingly replaced by actinide--ox

48 For the actinides, both the C(5)H(5) and more realistic C(5)Me(5

49 However, tetravalent actinides can also become mobile if they occur as colloi

50 ighly similar metals such as lanthanides and actinides can be easily distinguished at low micromolar

51 l) for the zirconium(IV) system, whereas the actinides can facilitate the approach of the diazoalkane

52 inides and lanthanides-and between different actinides-can be ascribed to minor differences in covale

53 r to the rational synthesis of triple-bonded actinide carbon compounds.

54 The unprecedented actinide-catalyzed addition of alcohols to carbodiimides

55 ctionalizations of the uranyl oxo by another actinide cation.

56 lecular ions featuring He atoms complexed to actinide cations are explored computationally using dens

57 hiophosphinate ligand exhibits for trivalent actinide cations in liquid-liquid extraction.

58 ylpentyl)dithiophosphinic acid for trivalent actinide cations over trivalent lanthanide cations.

59 for similarly sized trivalent lanthanide and actinide cations, despite the selectivity of bis(2,4,4-t

60 The electronic structure and nature of the actinide-chalcogen bonds were investigated with (77)Se a

61 ulations provide convincing evidence for the actinide-chalcogen multiple bonding in the title complex

62 Our knowledge of actinide chemical bonds lags far behind our understandin

63 One of the long standing debates in actinide chemistry is the level of localization and part

64 Development of actinide chemistry requires fundamental understanding of

65 bond has long remained a synthetic target in actinide chemistry.

66 unit were synthesized from the corresponding actinide chlorides (Th: 2; U: 3) and Na[Co(CO)4].

67 Additionally, actinide-cobalt bonds of 3.0771(5) A and 3.0319(7) A for

68 The mono(imidazolin-2-iminato) actinide complexes 3-8 display short An-N bonds together

69 l bands are exceedingly rare for tetravalent actinide complexes and reflect the strong bonding intera

70 Actinide complexes demonstrate unparalleled reactivity t

71 in the reactivities of the group 4 metal and actinide complexes does not arise on thermodynamic groun

72 The first examples of actinide complexes incorporating corrole ligands are pre

73 Determining the electronic structure of actinide complexes is intrinsically challenging because

74 culations have shown that 5f orbitals in the actinide complexes play a crucial role in stabilizing th

75 istry calculations, we have shown that these actinide complexes possess relatively strong U C triple

76 Conversely, in high oxidation state actinide complexes the inverse-trans-influence operates,

77 in family, specifically binds lanthanide and actinide complexes through molecular recognition of the

78 n chemistry of cyclometalated rare earth and actinide complexes with various small molecule substrate

79 ing redox transformations for organometallic actinide complexes, and that the terminal uranium nitrid

80 rk provides the first evidence for noble gas-actinide complexes, and the first example of neutral com

81 to ligand cyclometalation in rare earth and actinide complexes, including kinetic and mechanistic co

82 In rare earth and actinide complexes, ligand cyclometalation is most preva

83 erized the resulting siderocalin-transuranic actinide complexes, providing unprecedented insights int

84 to those established for organo-group 4 and actinide complexes.

85 esis of precursors for future supramolecular actinide complexing systems.

86 d degree of covalency in the ground state of actinide compounds as it is extensively done for 3d tran

87 gly interacting f-electrons in rare earth or actinide compounds may result in new states of matter.

88 d electron paramagnetic resonance spectra of actinide compounds.

89 dology to investigate a plethora of magnetic actinide compounds.

90 i.e., time elapsed since last purification), actinide concentrations, and relevant isotopic ratios/en

91 ssing the long-term structural durability of actinide-containing ceramics in terms of an atomistic un

92 rsued to tackle the international problem of actinide contamination of soils, sediments and water is

93 er those found in spectra of classical 5f(1) actinide coordination complexes.

94 In addition, actinide coordination compounds showed unprecedented rea

95 dditionally, the electronic structure of the actinide corroles was assessed using UV-vis spectroscopy

96 This report considers the chemistry of actinide dipicolinate complexes to identify why covalent

97 While the interactions in the actinide-dipicolinate complex are largely ionic, the dec

98 A modest increase in measured actinide:dipicolinate stability constants is coincident

99 ultistep synthetic approach with homogeneous actinide distribution and moderate solvothermal conditio

100 Because actinides (e.g., 239Pu and 237Np) are long-lived, they h

101 Actinide elements are not the only source of radioactive

102 Chemistry of the actinide elements represents a challenging yet vital sci

103 multiconfigurational f-orbital states in the actinide elements U and Pu and in a wide range of uraniu

104 In actinide elements, simple rocksalt compounds formed by P

105 sights into the electronic structures of the actinide elements.

106 Cerium was used as a surrogate for actinide elements.

107 d and compared between transition-metals and actinide elements.

108 fective complexants for chemoselective minor actinide extraction from used nuclear fuel, a series of

109 required for analysis of low-level man-made actinides for monitoring environmental radioactivity.

110 r the chemoselective separation of trivalent actinides from lanthanides in biphasic solvent systems.

111 )He(4)He ratios are related to the extent of actinide fuel consumption at time of production and are

112 itories requires a detailed understanding of actinide (geo)chemistry.

113 or of the f-electrons in the lanthanides and actinides governs important macroscopic properties but t

114 e, on the border between the light and heavy actinides-here, electron wave-particle duality (or itine

115 ies on both tetravalent transition metal and actinide hexahalides, MCl6(2-) (M = Ti, Zr, Hf, U).

116 f these hydride ligands would react like the actinide hydrides in [(C5Me5)2AnH2]2 (An = U, Th) and [(

117 in the actinide series could make the heavy actinides ideal elements to probe and tune effects of en

118 nide complexation, and solvent extraction of actinide(III) and lanthanide(III) radiotracers from nitr

119 elective and stable ligands able to separate actinide(III) from lanthanide(III) metal ions in view of

120 ptunium (Np(IV)) effectively immobilizes the actinide in many instances due to its low solubility and

121 ield experiments as well as the transport of actinides in a variety of environmental systems by traci

122 the simultaneous separation and detection of actinides in acidic solutions.

123 is-triazolyl-pyridines are able to strip all actinides in all the different oxidation states from a d

124 The participation of the valence orbitals of actinides in bonding has been debated for decades.

125 n of europium or other trivalent lanthanides/actinides in nuclear waste management.

126 lities of immobilizing the mobile species of actinides in the geosphere using metallic iron.

127 The concentration of the actinides in the GTS groundwater was determined with AMS

128 Ultralow level analysis of actinides in urine samples may be required for dose asse

129 ensitive to the substitution of U with other actinide, in contrast to conventional X-ray absorption m

130 on suggests the origin of covalency in heavy actinide interactions stems from the degeneracy of 5f or

131 roelectrochemical sensor for lanthanides and actinides into molten salt media.

132 of P4 reproducibly affords the unprecedented actinide inverted sandwich cyclo-P5 complex [{U(Tren(TIP

133 subtle differences between the transuranium actinide ions and their lighter lanthanide counterparts

134 The encapsulation of actinide ions in intermetalloid clusters has long been p

135 the luminescence of trivalent lanthanide and actinide ions in ternary protein-ligand complexes, drama

136 units; the latter has higher affinity toward actinide ions than does 1,2-HOPO at physiological pH.

137 XAS data indicated that the actinide is successively located first at octahedral bru

138 ve collection of trace-level lanthanides and actinides is advantageous for recovery and recycling of

139 The subsequent chemistry of later actinides is thought to closely parallel lanthanides in

140 arious high-stability ternary complexes with actinides, is demonstrated.

141 Analytical results of minor actinide isotopes and reactor model simulations confirme

142 A sample preparation sequence for actinide isotopic analysis by thermal ionization mass sp

143 synthesis of the mono(imidazolin-2-iminato) actinide(IV) complexes [(Im(R)N)An(N{SiMe3)2}3] (3-8) wa

144 implications regarding siderophore-enhanced actinide(IV) mobility in the terrestrial environment.

145 and characterization of a rare example of an actinide ketimide complex [Th(BIPM(TMS)){N(SiMe3)2}(N=CP

146 ates tight pH control in TALSPEAK (Trivalent Actinide-Lanthanide Separation by Phosphorus reagent Ext

147 rted significant 5f-orbital participation in actinide-ligand bonding for uranium(VI) complexes in con

148 he involvement of both 5f and 6d orbitals in actinide-ligand bonding in UCl(6)(2-).

149 eature short U-E bond lengths, suggestive of actinide-ligand multiple bonding.

150 s used to calculate the production ratios of actinides (like uranium-238 and thorium-232).

151 mical bonding using advanced spectroscopies: actinide M4,5 HR-XANES and 3d4f RIXS.

152 a prime nuclear fuel and thoroughly studied actinide material, remain a long standing puzzle, a resu

153 nium nitride (UN) is one of the most studied actinide materials as it is a promising fuel for the nex

154 the manufacturing and processing history of actinide materials for nuclear forensic investigations.

155 Thus, the redox behaviour of actinide materials is important for the design of nuclea

156 s in the physical and chemical properties of actinide materials, degrading their performance in fissi

157 he multifaceted character of 5f electrons in actinide materials, from localized to itinerant and in b

158 standing the strongly-correlated behavior of actinide materials.

159 vestigate the magneto-structural coupling in actinide materials.

160 In contrast to most actinide-mediated bond activations, the dealkylation eve

161 d in the formation of new species containing actinide-metal bonds in good yields (Th: 6; U: 7); this

162 -imine (Im(R)NH, R = tBu, Mes, Dipp) and the actinide metallacycles [{(Me3Si)N}2An{kappa(2)C,N-CH2SiM

163 e methods to analyze for plutonium and other actinide metals are needed.

164 bcc phase, that is generally present in all actinide metals before melting, is critically important

165 igand multiple bonding involving the f-block actinide metals.

166 The disposition of actinides, most recently 239Pu from dismantled nuclear w

167 of current interest as simple models for new actinide nitride nuclear fuels, and for their potential

168 Molecules containing actinide-nitrogen multiple bonds are of current interest

169 tive way of separating heat generating minor actinides (Np, Am, Cm) from spent nuclear fuel solution

170 t 2c-2e pairing of two elements involving an actinide on a macroscopic scale under ambient conditions

171 me series data during loading and elution of actinides onto/from the resin.

172 5f orbitals on the reactivity and bonding in actinide organometallic complexes.

173 nt, and have relevance to the aggregation of actinide oxide clusters.

174 overcome the high barrier of scission of the actinide-oxygen bond.

175 In the Np(IV)-silica colloids, the actinide--oxygen--actinide bonds are increasingly replac

176 -actinide bonds are increasingly replaced by actinide--oxygen--silicon bonds due to structural incorp

177 Recent reports have suggested the late actinides participate in more covalent interactions than

178 )-phosphinidiide (Th-P(H)-Th) and a discrete actinide-phosphido complex under ambient conditions (Th=

179 hetic radionuclides, such as the transuranic actinides plutonium, americium, and curium, present seve

180 Although the nuclear properties of the late actinides (plutonium, americium and curium) are fully un

181 f-assembly of ([UO2(O2)OH]60)(60-) (U60), an actinide polyoxometalate with fullerene topology, can be

182 al, solution, and computational chemistry of actinide POMs warrants comparison to the mature chemistr

183 are higher than fallout values, again due to actinide production activities.

184 ) and Am(III), and large proportions of both actinides (Pu, 97.7%; Am, 86.8%) were associated with mo

185 e bonds, analogous complexes involving other actinides remain scarce.

186 Graphene oxide (GO) has great potential for actinide removal due to its extremely high sorption capa

187 minosilicate clays play an important role in actinide retardation and colloid-facilitated transport i

188 ponsible for the anomalous behaviour of late actinides, revisiting the concept of valence using a the

189 f heavy metal ions, including lanthanide and actinide salts in aqueous solution.

190 The ascertained high actinide selectivity, efficiency, extraction kinetics, a

191 A break in periodicity occurs in the actinide series between plutonium and americium as the r

192 m is positioned at a crucial location in the actinide series between the inherently stable half-fille

193 al extension of the 5f orbitals later in the actinide series could make the heavy actinides ideal ele

194 om a second transition in periodicity in the actinide series that occurs, in part, because of the sta

195 indicate a decrease in covalency across the actinide series, and the evidence points to highly ionic

196 alence orbitals in covalent bonds across the actinide series.

197 urther support for a postcurium break in the actinide series.

198 tes on Fe samples with different exposure to actinide solutions can be estimated.

199 ical tools are required to gain insight into actinide speciation in a given system.

200 nged uranium oxo motif might exist for other actinide species in the environment, and have relevance

201 agnetic nanoparticles (MNPs) conjugated with actinide specific chelators (MNP-Che) is reviewed with a

202 The anomalous properties of the late actinides stem from the competition between itinerancy a

203 hin the Earth's inner core, consisting of an actinide subcore at the center of the Earth, surrounded

204 Europium (an analogue for trivalent actinides) substituted at the Ca(2) and/or the Ca(3) pos

205 ion of Pu(IV) in the presence of a trivalent actinide such as Am(III), and (iii) preferential sorptio

206 lf-lives (e.g., (36)Cl, (99)Tc, (129)I, some actinides such as (236)U) have been understudied by comp

207 These include plutonium and minor actinides such as americium and curium.

208 um(III) as a representative of the trivalent actinides such as americium or curium.

209 chanism of intracellular entry for trivalent actinides such as curium and provide a new tool utilizin

210 Therefore, developing actinide systems that not only perform noteworthy chemis

211 ts the first application of Cl K-edge XAS to actinide systems.

212 g Rd determined for the (solely) tetravalent actinide Th on calcite, suggesting reduction of Np(V) to

213 remove selected lanthanides (Ce and Eu) and actinides (Th, Pa, U, and Np) from fresh and salt water

214 geological disposal there is consensus that actinides that have been separated from spent nuclear fu

215 ften inferred from the lanthanides and minor actinides (that is, Am, Cm), with limited success.

216 d characteristic fluorescence transitions of actinides, their reduction rates on Fe samples with diff

217 type not related to any previously observed actinide thiophosphates and contain the (P(2)S(7))(4-) c

218 330 mg of TEVA (abbreviation for tetravalent actinides)) through programmable beads transport.

219 le and versatile while allowing the valuable actinides to be recovered and recycled.

220 undwater unambigiously indicate reduction of actinides to, respectively, uranium(IV) and neptunium(IV

221 study the long-term release and retention of actinide tracers in field experiments as well as the tra

222 A series of actinide-transition metal heterobimetallics has been pre

223 of the biochemical interactions involved in actinide transport is instrumental in managing human con

224 um for the determination of other biological actinide transport mechanisms.

225 ental understanding of the relative roles of actinide valence-region orbitals and the nature of their

226 The risk stemming from human exposure to actinides via the groundwater track has motivated numero

227 Technetium was separated from the actinides via valence control of technetium (as Tc(VII))

228 , the long-term release and retention of the actinides was investigated over 8 months in the tailing

229 ities of the group 4 metal complexes and the actinides was used as a unique platform for investigatin

230 ivalent europium, a substitute for trivalent actinides, was investigated by time-resolved laser-induc

231 For actinides, we find a pre-edge shoulder for 4 (Th) and di

232 In the present study, actinides were concentrated from the sample matrix via i

233 s inform our understanding of the bonding of actinides with soft donor ligands and may be of use in f

234 Monitoring of actinides with sophisticated conventional methods is aff

235 more covalent interactions than the earlier actinides, yet the origin of this shift in chemistry is