Abstract
The structures, stabilities, and energy characteristics of simple and multi-decker binuclear sandwich compounds of alkali and alkaline-earth metals with cyclobutadiene, cyclopentadiene, and benzene rings were studied within the framework of the density functional theory by the B3LYP/6-311+G** method. Stable electronic structures of the multi-decker sandwich complexes studied can be formed if the sum of the number of valence electrons of metal atoms and the number of basal-ring π-electrons is 8n – 2, where n is the number of basal rings. Factors responsible for steric and electronic stabilization of such systems as well as co-operative effects associated with changes in the electronic and structural properties of the complexes upon chain extension are analyzed.
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