Bis[-µ-methyl-1.3-dimethyl-h3 -allyl-nickel] Struktur und Bindungsverhältnisse eines Alkyl-verbrückten Ni-Ni-Systems / Bis [-µ-methyl-1,3-dimethyl-h3 -allyl-nickel] The Bonding in an Alkyl-Bridged Ni-Ni System
Open Access
- 1 October 1978
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 33 (10) , 1110-1115
- https://doi.org/10.1515/znb-1978-1014
Abstract
The crystal structure of the diamagnetic title compound (1), a = 9.9594(9), b = 9.3895(7), c = 14.8434(8), β = 95.112(5) is described. Two co-ordinatively square planar nickel atoms each carrying a h3-C5H9 group are linked together by two methyl bridges, with the h3-C5H9 groups lying cisoid about the two nickel atoms. The molecule is folded about its centre so that the Ni-Ni distance is only 2.371, indicating a strong interaction within the unsaturated metal system. The bridging methyl groups form novel, slightly unsymmetrical two electron - three centre bonding systems. The electronic structure of 1 is analysed by MO methods. The nature of the nickel-nickel interaction as well as the stabilising factors of these unsaturated systems are explained. A discussion centred about one low energy LUMO leadsKeywords
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