Abstract
(C 5H 5) 3Sb was synthesized by treatment of Sb(NMe 2) 3 with excess monomeric cyclopentadiene in quantitative yield. The compound crystallizes in the space group P2 1/ c with Z = 4; d c 1.606 g cm −3; a 1036.5(15) pm; b 872.1(10 pm; c 1563.6(21) pm; β 109.47(12)°. At 223 K a set of 1849 unique reflections was obtained, 1574 with F > 2σ( F) have been used for refining the structure; full-matrix treatment with individual anisotropic temperature factors led to a reliability index R w = 0.025. The molecular structure unequivocally shows the existence of σ-bonded ( 1 h-monohapto)cyclopentadienyl rings with approximate tetrahedral angles between the “best planes” of the five-membered rings and the SbC bond directions. The space-demanding non-bonding electron pair at the Sb atom influences the molecular packing: channels are formed along the b-axis of the elementary cell.
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