ISSN:
0947-6539
Keywords:
carbonyl ligands
;
organometallic compounds
;
phosphorus ligands
;
tantalum compounds
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Reduction of [TaCl5] by six equivalents of alkali metal naphthalenide in 1,2-dimethoxyethane at -60°C followed by treatment with gaseous PF3 provides the first homoleptic phosphane complex containing tantalum in the -1 oxidation state, [Ta(PF3)6]-. This can be protonated by concentrated sulfuric acid to yield the previously unknown highly acidic and volatile hydride [HTa(PF3)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 [Ph3SnTa(CO)5]2-, respectively. The hydride is a useful precursor to [(Ph3PAu)3Ta(CO)5], the only known gold cluster of tantalum.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/chem.19950010805