Abstract
As small-volume cationic charge centers and as a source of unoccupied valence orbitals, the early main group metals have a well-documented but remarkable organometallic chemistry. Unusual structural configurations are observed for organolithium, beryllium, and aluminum compounds including semibridging {sigma}-{pi} coordination in organometallic acetylenes such as (C{sub 6}H{sub 5}){sub 2} AlC{triple bond}CC{sub 6}H{sub 5}{sup 2} {pi} back-donation which leads to planar three coordinate metal atom configurations as in (BeN(CH{sub 3}){sub 2}){sub 3}, alkyl C-H coordination as in LiB(CH{sub 3}){sub 4} or (LiC{sub 6}H{sub 11}){sub 2}, and frontier orbital directed coordination away from charge potential energy minima in {pi} carbanions. The authors present here the results of recent structural studies of Li{sub 2}CD{sub 2} as obtained from neutron and x-ray scattering experiments. The nontrivial synthesis of a pure phase of Li{sub 2}CD{sub 2} used in this study was carried out by the Kawa-Lagow modified Ziegler technique.
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