G. Reiss, W. Frank, J. Schneider
1995
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0
Influential Citations
10
Citations
Journal
Main Group Metal Chemistry
Abstract
The 1:1 adduct of bismuth(III) trifluoroacetate with trifluoracetic acid 1 was prepared from bismuth(III) oxide, trifluoroacetic anhydride and trifluoroacetic acid in dichloromethane. Crystals were grown from trifluoroacetic acid and the crystal structure could be determined by X-ray diffraction methods. 1 crystallizes in the centrosymmetric space group P2,/« with a = 9.096(2) A, b = 8.535(2) A, c = 22.205(4) Α, β = 95.25(3)°, Ζ = 4; R = 8.71 %, R w = 7.81 for all data with I > 0. The bismuth atom has a highly asymmetric coordination polyhedron with nine relevant Bi Ο distances in the range of 2.26(3) to 2.90(3) A. Three short Bi Ο distances between 2.26(3) and 2.27(3) A and corresponding Ο Bi Ο angles from 80.0 to 81.0° reflect the lonepair situation of bismuth in this compound. The structure is built up by infinite chains along the crystallographic b axis. Three trifluoroacetate groups and the trifluoroacetic acid molecule are bound to the bismuth atoms via their C Ο functions. Two of the trifluoroacetate groups act as 'tridentate' bridging ligands between a bismuth atom and its two symmetry dependant neighbours in the chain. The third trifluoroacetate group and the trifluoroacetic acid molecule are connected by a strong 0-H.. .0 hydrogen bridge. Both parts form an unidentate coordination to a bismuth atom and together they act as a new bidentate bridging ligand on both sides between every second part of the chain.