Technetium

PEACOCK, R.D.

doi:10.1016/b978-0-08-018870-6.50006-8

Cited by 9 publications

(7 citation statements)

References 11 publications

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“…The solubilization of Re 2 O 7 in organic solvents has provided some conflicting reports. At a certain stage several studies described Re 2 O 7 as being insoluble in any organic solvent in the strict absence of water. , Solubility was then attributed to the formation of soluble perrhenic acid from residual water in the solvent. As a matter of fact, Re 2 O 7 dissolves freely in water to give perrhenic acid (formally HReO 4 ; p K a = −1.25), which can be crystallized out of these solutions as the bis(aqua) adduct of Re 2 O 7 , i.e.…”

Section: Lreo3 Compounds and Derivativesmentioning

confidence: 99%

Rhenium(VII) Oxo and Imido Complexes: Synthesis, Structures, and Applications

1997

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ContentsI. Introduction 3197 II. LReO 3 Compounds and Derivatives 3199 A. Inorganic XReO 3 Compounds and Derivatives 3199 1. Dirhenium Heptaoxide, Re 2 O 7 , and Derivatives 3199 2. Halides and Pseudohalides of Type XReO 3 and Their Adducts 3200 3. R 3 EOReO 3 Compounds and Their Adducts (E ) C, Si, Sn, Ge, Sn, Pb) 3202 4. The Amido R 2 NReO 3 , the Phosphiniminato Complexes, and Their Adducts 3204 5. The Carboxylato Complexes (RCOO)-ReO 3 and Their Adducts 3204 6. The [L 3 ReO 3 ] + and [L 3 ReO 3 ] Complexes 3205 7. Miscellaneous Inorganic LReO 3 Derivatives 3206 8. Structural and Spectroscopic Characterization 3206 9. Reactions of Re 2 O 7 and XReO 3 Compounds 3208 B. Organic RReO 3 Compounds and Derivatives 3209 1. The Alkyl RReO 3 Derivatives 3209 2. The Methyl(vinyl)ReO 3 Complex 3212 3. Allyl, Benzyl, and Pseudoallylic Compounds 3212 4. The Alkinyl RReO 3 Derivatives 3212 5. The Aryl Derivatives 3213 6. The Cyclopentadienyl Derivatives 3213 7. The Indenyl Derivative 3214 8. Structural and Spectroscopic Characterization 3215 9. Reactions of Organic RReO 3 Compounds 3220 10. Applications 3223 III. The L 3 ReO 2 Compounds and Derivatives 3230 A. Inorganic X 3 ReO 2 Derivatives 3230 B. Organic and Mixed Derivatives 3231 IV. The L 4 Re 2 O 5 Compounds and Derivatives 3234 V. The L 5 ReO Compounds and Derivatives 3234 VI. The Re(VII) Imido Compounds and Derivatives 3234 A. The Inorganic XRe(NR) 3 Derivatives 3235 B. The Organic RRe(NR) 3 Derivatives 3236 C. The Inorganic X 3 Re(NR) 2 Derivatives 3236 D. The Organic R 3 Re(NR) 2 Derivatives 3237 E. Miscellaneous Polynuclear and Mixed Imido and Oxo−Imido Derivatives 3238 F. The X 5 Re(NR) Derivatives 3238 G. Reactions of XRe(NR) 3 Complexes 3238 H. Reactions of X 3 Re(NR) 2 and Derivatives 3239 1. The Imido−Alkyne XR(NAr) x (η 2 -C 2 R 2 ) 3-x Complexes 3239 2. The Imido−Alkylidene and Imido−Alkylidyne Complexes 3240 I. Structural Studies 3241 VII. Conclusions 3243 VIII. Abbreviations 3243 IX. Acknowledgments 3243 X. References 3243 3197

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Section: Lreo3 Compounds and Derivativesmentioning

confidence: 99%

Rhenium(VII) Oxo and Imido Complexes: Synthesis, Structures, and Applications

1997

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“…Most of these compounds are unstable in aqueous environments, disproportionating into TcO 2 ·2H 2 O and TcO 4 - . The solid oxyhalides, TcO 3 F and TcOF 4 , have been prepared by the reduction of TcO 4 - by anhydrous HF. , Technetium (and rhenium) oxyhalides in general, readily hydrolyze in basic aqueous environments to give pertechnetic acid and hydrohalic acid…”

Section: Aqueous Solution Chemistrymentioning

confidence: 99%

Chemistry of Technetium and Rhenium Species during Low-Level Radioactive Waste Vitrification

1996

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We reviewed the chemistry of radioactive technetium species and their nonradioactive rhenium surrogates in the context of Hanford Site low-level radioactive waste processing and vitrification. Information concerning the hydrolysis, precipitation, phase transformation, volatilization, and redox chemistries of these species during the drying, calcining, and vitrification of aqueous waste slurries is condensed and extrapolated from the literature. The similarities between the chemistry of technetium and rhenium species were highlighted to evaluate the performance of rhenium as a surrogate for technetium in laboratory and engineering-scale low-level radioactive waste vitrification experiments.

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“…Again, most of these compounds were unstable in aqueous environments, disproportionating into . The solid oqhalides, TcO3F &d TcOF4, have been prepared by the reduction of TcO4-by anhydrous HF (Peacock, 1973). Technetium (and rhenium) oqhalides in general, readily hydrolyze in basic aqueous environments to givepertechnetic acid and hydrohalic acid ipeacock, 1966).…”

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confidence: 99%

Volatility literature of chlorine, iodine, cesium, strontium, technetium, and rhenium; technetium and rhenium volatility testing

Langowski¹,

Darab²,

Smith³

1996

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This report reviews the voIatili&hterature relevant to iodinerstrontium, cesium and chlorine as might be expected from the vitrification of low-level wastes at Hanford. In addition, the report contains a review of the aqueous chemistry and volatilization behavior of technetium and a proposed surrogate, rhenium. Some preliminary tests of technetium and rhenium volatility have been performed and are reported iii . .

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Technetium

Cited by 9 publications

References 11 publications

Rhenium(VII) Oxo and Imido Complexes: Synthesis, Structures, and Applications

Rhenium(VII) Oxo and Imido Complexes: Synthesis, Structures, and Applications

Chemistry of Technetium and Rhenium Species during Low-Level Radioactive Waste Vitrification

Volatility literature of chlorine, iodine, cesium, strontium, technetium, and rhenium; technetium and rhenium volatility testing

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