Synthesis of new dithiacobaltaborane clusters derived from arachno-6,8-S/sub 2/B/sub 7/H/sub 9/
A series of air-stable dithiacobaltaborane clusters has been isolated from either the reaction of the arachno-S/sub 2/B/sub 7/H/sub 8//sup -/ anion with cobalt chloride and pentamethylcyclopentadienide or the reaction of neutral arachno-6,8-S/sub 2/B/sub 7/H/sub 9/ with cobalt atoms and pentamethylcyclopentadiene. Thus, the reaction of arachno-S/sub 2/B/sub 7/H/sub 8//sup -/ with CoCl/sub 2/ and C/sub 5/(CH/sub 3/)/sub 5//sup -/ in THF gave, as the major products, the triple-decker compound nido-4,6-/eta/-C/sub 5/(CH/sub 3/)/sub 5//sub 2/Co/sub 2/-3,5-S/sub 2/B/sub 2/H/sub 2/ (I) and the 11-vertex cluster nido-8,10(/eta/-C/sub 5/(CH/sub 3/)/sub 5/)/sub 2/Co/sub 2/-7,9-S/sub 2/B/sub 7/H/sub 7/ (III). Also isolated in smaller amounts were a chloride derivative of I, nido-1-Cl-4,6-(/eta/-C/sub 5/(CH/sub 3/)/sub 5/)/sub 2/Co/sub 2/-3,5-S/sub 2/B/sub 2/H (II), two isomers of III, nido-3,10-(/eta/-C/sub 5/(CH/sub 3/)/sub 5/)/sub 2/Co/sub 2/-7,9-S/sub 2/B/sub 7/H/sub 7/ (IV) and nido-3,5-(/eta/-C/sub 5/(CH/sub 3/)/sub 5/)/sub 2/Co/sub 2/-7,9-S/sub 2/B/sub 7/H/sub 7/ (V), and the eight-boron cluster nido-8-(/eta/-C/sub 5/(CH/sub 3/)/sub 5/)Co-7,9-S/sub 2/B/sub 8/H/sub 8/ (VI). Other trace products of the reaction included the six-boron clusters nido-5,8-(/eta/-C/sub 5/(CH/sub 3/)/sub 5/)/sub 2/Co/sub 2/-6,9-S/sub 2/B/sub 6/H/sub 6/ (VII) and arachno-7-(/eta/-C/sub 5/(CH/sub 3/)/sub 5/)Co-6,8-S/sub 2/B/sub 6/H/sub 8/ (VIII). Compound III was found to isomerize at 250/degree/C to IV, which could then be converted to V at 300/degree/C. The reaction of cobalt atoms with arachno-6,8-S/sub 2/B/sub 7/H/sub 9/ in the presence of pentamethylcyclopentadiene gave VIII as the major product; however, a number of other clusters including I, V, VI, and ((/eta/-C/sub 5/(CH/sub 3/)/sub 5/)/sub 2/Co)/sup +/((SB/sub 10/H/sub 10/)/sub 2/Co)/sup -/ were isolated in trace amounts. 16 references, 6 figures, 3 tables.
- Research Organization:
- Univ. of Pennsylvania, Philadelphia (USA)
- OSTI ID:
- 5637502
- Journal Information:
- Inorg. Chem.; (United States), Vol. 27:21
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BORANES
SYNTHESIS
COBALT COMPLEXES
SULFUR COMPOUNDS
BORON 11
EXPERIMENTAL DATA
NMR SPECTRA
BORON COMPOUNDS
BORON ISOTOPES
COMPLEXES
DATA
INFORMATION
ISOTOPES
LIGHT NUCLEI
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
SPECTRA
STABLE ISOTOPES
TRANSITION ELEMENT COMPLEXES
400201* - Chemical & Physicochemical Properties
400202 - Isotope Effects
Isotope Exchange
& Isotope Separation