Complexes of divalent lanthanides (Yb(ii), Eu(ii), Sm(ii)) with decaborates. (Reannouncement with new availability information)
Technical Report
·
OSTI ID:200111
Decaborate complexes of divalent lanthanides are prepared through the reduction of B10H14 by elemental lanthanides in liquid NH3. The products are insoluble in liquid NH3. Extraction with CH3CN yields the complexes (CH3CH)6Yb(B10H14) and (CH3CN)xEu(B10H14), in which the boron cage is bound to the lanthanide dianion through Ln-H-B bonds. Solvent-separated decaborate anions (B10H13)- and (B10H15)- are also observed in the CH3CN extracts. Reductions of B10H14 by lanthanide amalgams, Ln(Hg) (Ln = Sm, Yb), in 1,2-dimethoxyethane (DME) produce small amounts of the DME-soluble salts containing the solvent-separated decaborate anions (B10H13)- and (B10H15)-. The major reaction product is insoluble in DME, but extraction with CH3CN yields salts with the solvent-separated (B10H13)- and (B10H15)-. Solvent-free Eu(B10B10) and Yb(B10B10) are prepared by decomposing in vacuum at 200 deg C NH3- and also CH3CN-solvated salts of Eu(B10H14) and Yb(B10H14). Further decomposition of Yb(B10H10) at temperatures above 600 deg C in vacuum leads to the formation of YbB6.
- Research Organization:
- Ohio State Univ., Columbus, OH (United States). Dept. of Chemistry
- OSTI ID:
- 200111
- Report Number(s):
- AD-A--261141/6/XAB; CNN: Grant DAAL03-92-G-0199
- Country of Publication:
- United States
- Language:
- English
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