Abstract
Dicyclopentadienylzinc, (C 5H 5) 2Zn, crystallizes in the monoclinic system, space group P2 1/ c ( Z = 8). Cell dimensions are: a 14.046(1), b 8.640(1), c 15.828(2) Å; β 113.03(1)°. The structure consists of infinite chains of zinc atoms with bridging cyclopentadienyl groups. In addition, each zinc atom carries a terminal cyclopentadienyl group. The chains, which run parallel to the a-axis, contain two crystallographically independent zinc atoms in the order ...12211221... The cyclopentadienyl groups bridging between zinc atoms of the same type are located over centers of symmetry and therefore disordered. The cyclopentadienyl group bridging between Zn(1) and Zn(2) is normal. It appears that both σ and π-type interactions contribute to the cyclopentadienyl—zinc bonds.
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