Schneider, Jorg J.; Czap, Norbert; Bliser, Dieter; Boese, Roland:

Synthesis and structure of dinuclear [(2-tert-butyl-4,5,6-trimethylphenyl)2Sn-CO(h2-ethene)(h5-Me5C5)] and its thermal conversion to trinuclear [{(2-tert-butyl-4,5,6-trimethylphenyl)2Sn}2Co(h5-Me5C5)]{Co-Sn2}.

In: Journal of Organometallic Chemistry, Jg. 584 (1999) ; Nr. 2, S. 338-343
ISSN: 0022-328X
Zeitschriftenaufsatz / Fach: Chemie
Abstract:
The title compds. I (R = h2-CH2:CH2, bis(6-tert-butyl-2,3,4-trimethylphenyl)stannyl) are prepd. by reacting bis{(h2-ethene)}(h5-pentamethylcyclopentadienyl)cobalt(I) with Weidenbruch's stannylene bis[bis{6-tert-butyl-2,3,4-trimethylphenyl}tin] (II) employing different thermal reaction conditions. Compds. I are rare examples of transition metal complexes of II. According to an x-ray crystal structure detn., I (R = h2-CH2:CH2) displays a half-sandwich structure with trigonal planar coordinated Co atom and a subvalent Sn(II) center. The Co-Sn bond length is 2.3926(4).ANG. and represents one of the shortest reported so far. A comparison of relevant bonding parameters of I (R = h2-CH2:CH2) and several related Co-Sn half-sandwich compds. contg. low valent SnR2 fragments reveals comparable steric and electronic effects of the stannylenes towards the 16 e {(h2-ethene)(Me5C5)Co} fragment in these complexes. In contrast to the isostructural ethene/stannylene complex bis{methyl(trimethylsilyl)}stannio(h2-ethene)(h5-cyclopentadienyl)cobalt contg. Lappert's bis(stannanediyl) is inert towards H2O and does not activate water by an oxidative addn. reaction to give a mixed hydroxo hydrido complex. At elevated temps., I (R = h2-CH2:CH2) reacts via ethene dissocn. and ligand redistribution to form the trinuclear cobalt bis stannylene half sandwich complex Bis[bis{6-tert-butyl-2,3,4-trimethylphenyl}]stannio(h5-pentamethylcyclopentadienyl)cobalt(I) in moderate yields.

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