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New PF 3 and Carbonyl Chemistry of Tantalum
Author(s) -
Ellis John E.,
Warnock Garry F.,
Barybin Mikhail V.,
Pomije Marie K.
Publication year - 1995
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.19950010805
Subject(s) - chemistry , tantalum , hydride , inorganic chemistry , alkali metal , homoleptic , dimethoxyethane , ammonia , protonation , metal , organic chemistry , electrolyte , ion , electrode
Reduction of [TaCl 5 ] by six equivalents of alkali metal naphthalenide in 1,2‐dimethoxyethane at −60°C followed by treatment with gaseous PF 3 provides the first homoleptic phosphane complex containing tantalum in the −1 oxidation state, [Ta(PF 3 ) 6 ] − . This can be protonated by concentrated sulfuric acid to yield the previously unknown highly acidic and volatile hydride [HTa(PF 3 ) 6 ]. An improved normal‐pressure synthesis of [Ta(CO) 6 ] − is described. Reduction of the latter species by sodium in liquid ammonia gives the carbonyl trianion [Ta(CO) 5 ] 3− which undergoes monoprotonation and stannylation to form [HTa(CO) 5 ] 2− and [Ph 3 SnTa(CO) 5 ] 2− , respectively. The hydride is a useful precursor to [(Ph 3 PAu) 3 Ta(CO) 5 ], the only known gold cluster of tantalum.