ライフサイエンスコーパス: actinide

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

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

3 learly located in the first shell around the actinide.

4 interactions become more prominent for heavy actinides.

5 ioactive waste and of the recycling of minor actinides.

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

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

8 even stable, superheavy elements beyond the actinides.

9 ies of waste forms for the immobilization of actinides.

10 in the structural and spectroscopic study of actinides.

11 rom an aqueous matrix or for bulk removal of actinides.

12 the geochemical sequestration of radiotoxic actinides.

13 ost no direct measures of such covalency for actinides.

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

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

16 ne method was developed for determining five actinides ((241)Am, (239)Pu, (237)Np, (232)Th, and (238)

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

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

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

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

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

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

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

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

25 The chemistry of actinide (An) and rare-earth metal (Ln and group 3) comp

26 These actinide (An) complexes were synthesized using a hexa-az

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

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

29 nvolving Y, lanthanides (Ln, from La to Lu), actinides (An, from Ac to Lr), Ti, and Zr is initially i

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

31 for their radioactive counterparts), Ce (an actinide analog), Re (a Tc analog), bentonite particles,

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

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

34 d this work establishes a unique marriage of actinide and FLP chemistries.

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

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

37 ompasses transition metals, lanthanides, and actinides and describes recently discovered molecular ma

38 %) enables the isolation of Bk from adjacent actinides and fission products.

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

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

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

42 Worldwide stocks of actinides and lanthanide fission products produced throu

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

44 e the structure and electronic properties of actinides and lanthanides that are difficult to synthesi

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

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

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

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

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

50 DOHA in dodecane, showed strong affinity for actinides and was successfully employed for the removal

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

52 ontrast reagents, and biological probes, and actinides are central to nuclear fuel and fire alarms.

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

54 Lanthanides and actinides are elements of ever-increasing technological

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

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

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

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

59 of uranium (U) isotopes in small volumes of actinide-bearing materials is critical for a variety of

60 of isotopic abundances in the broad class of actinide-bearing materials, providing unique insights in

61 us isostructural series, including the later actinides berkelium and californium.

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

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

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

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

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

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

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

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

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

71 The unprecedented actinide-catalyzed addition of alcohols to carbodiimides

72 ctionalizations of the uranyl oxo by another actinide cation.

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

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

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

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

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

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

79 nity for oxygen, the synthesis of phase-pure actinide chalcogenide materials free of oxide impurities

80 Actinide chalcogenides are of interest for fundamental s

81 d-state reactions, and in situ generation of actinide chalcogenides in flux crystal growth reactions.

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

83 Given the very basics of lanthanide and actinide chemistry are being frequently redefined this i

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

85 Development of actinide chemistry requires fundamental understanding of

86 ligands) is a longstanding bonding model in actinide chemistry, in which metal-ligand binding uses 6

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

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

89 Novel actinide cluster fullerenes, U(2)C(2)@I(h)(7)-C(80) and

90 ments can lead to the stabilization of novel actinide clusters, which are not accessible by conventio

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

92 ration of a seemingly non-magnetic molecular actinide complex carrying sizable spin and orbital magne

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

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

95 Actinide complexes demonstrate unparalleled reactivity t

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

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

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

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

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

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

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

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

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

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

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

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

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

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

110 esis of precursors for future supramolecular actinide complexing systems.

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

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

113 d electron paramagnetic resonance spectra of actinide compounds.

114 dology to investigate a plethora of magnetic actinide compounds.

115 f ligands to study the effect of pressure on actinide compounds.

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

117 iple bonds compared to its 5f(0)6d(0) Th(IV) actinide congener.

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

119 tic insights for a relatively young class of actinide-containing frameworks.

120 Thermodynamic studies of actinide-containing metal-organic frameworks (An-MOFs),

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

122 onventional An-C bond decreasing, due to the actinide contraction, the An-C distance increases from P

123 silsesquioxane ligand and suggests that the actinide coordination chemistry of mineral surface mimic

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

125 In addition, actinide coordination compounds showed unprecedented rea

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

127 lex, and it is only the second example of an actinide-cyclobutadienyl complex, the other being an inv

128 Searching for actinide decorporation agents with advantages of high de

129 Removing actinides deposited in bones after intake is one of the

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

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

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

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

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

135 driven covalency, becomes dominant via short actinide-element distances, this ionic ESP effect is ove

136 Actinide elements are not the only source of radioactive

137 e cages and the variable oxidation states of actinide elements can lead to the stabilization of novel

138 udes transition metal, lanthanide, and early actinide elements in the hexanuclear nodes.

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

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

141 ts expand this class of materials to include actinide elements, shows that superconductivity is robus

142 In actinide elements, simple rocksalt compounds formed by P

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

144 sights into the electronic structures of the actinide elements.

145 Cerium was used as a surrogate for actinide elements.

146 As actinides exhibit an extremely high affinity for oxygen,

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

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

149 uccessfully employed for the removal of bulk actinides from aqueous samples with more than 96% recove

150 atrix elimination and/or preconcentration of actinides from complex aqueous samples and (ii) served a

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

152 itate chemoselective separation of the minor actinides from the lanthanides are critical to the closu

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

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

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

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

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

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

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

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

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

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

163 Thorium is the most abundant actinide in the Earth's crust and has universally been c

164 f the calculated species distribution of the actinides in 1 M acetic acid and the corresponding avera

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

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

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

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

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

170 them to immobilize trivalent lanthanide and actinides in the environment.

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

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

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

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

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

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

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

178 erized hexafluorido complex of a tetravalent actinide ion, the [UF(6) ](2-) anion, is reported in the

179 UHf)(0.69), which is the first to include an actinide ion.

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

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

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

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

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

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

186 Our work implies that covalency in actinides is complex even when dealing with the same ion

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

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

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

190 ssion can be enabled by recycling long-lived actinide isotopes within the nuclear fuel cycle.

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

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

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

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

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

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

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

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

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

200 l studies of the behavior of 5f electrons in actinides located in a soft ligand coordination environm

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

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

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

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

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

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

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

208 vestigate the magneto-structural coupling in actinide materials.

209 standing the strongly-correlated behavior of actinide materials.

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

211 Simple bridging ligands assemble two actinide metal cations into narrow dinuclear metallacycl

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

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

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

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

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

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

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

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

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

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

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

223 rification against uranyl ions and trivalent actinides or fission products.

224 5f orbitals on the reactivity and bonding in actinide organometallic complexes.

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

226 t for the safe use, storage, and disposal of actinide oxides in the nuclear fuel cycle, since their o

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

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

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

230 lacyclopropenes and metallacyclocumulenes of actinides (Pa-Pu) that makes them distinct from their co

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

232 the instantaneous formation of highly stable actinide phosphate complexes upon contact with hydroxyap

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

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

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

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

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

238 h the early Solar System abundance ratios of actinides produced exclusively through the r-process, we

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

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

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

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

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

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

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

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

247 provides valuable mechanistic insights into actinide separation processes that widely use quaternary

248 Curium is unique in the actinide series because its half-filled 5f (7) shell has

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

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

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

252 ion orbital interactions arises as the early actinide series is traversed from Th(IV) to U(IV) and Np

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

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

255 valence states such as in the lanthanide and actinide series.

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

257 alence orbitals in covalent bonds across the actinide series.

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

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

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

261 B complexes), and finally the rare-earth and actinide species.

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

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

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

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

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

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

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

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

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

271 geoning, analogous complexes involving other actinides such as thorium remain rare and there are not

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

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

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

275 he electrophoretic mobilities (mu(e)) of the actinides Th and U-Am in different oxidation states (pre

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

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

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

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

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

281 330 mg of TEVA (abbreviation for tetravalent actinides)) through programmable beads transport.

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

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

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

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

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

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

288 The trend in the mu(e) for the actinides U-Pu was found to be An(III) > An(VI) > An(V)

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

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

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

292 c medium, in the presence of other competing actinides, viz., Am(III), U(VI), and Np(V).

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

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

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

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

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

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

299 Monitoring of actinides with sophisticated conventional methods is aff

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