Trifluoroacetate as a Bridging Ligand for Antimony(V): Crystal and Molecular Structures of μ-Fluoro-μ-trifluoroacetato-bis (1) and of μ-Oxo-di-μ-trifluoroacetato-bis (2)

Article abstract of DOI:10.1039/DT9800000109

Crystals of title compound (1), Sb2(O2CCF3)F9, are monoclinic.Space group P2₁/c with a=9.386(6), b=15.119(8), c=16.250(7) Angstroem, β=110.52(11) deg, and Z=8.The asymmetric unit contains two equivalent but crystallographically independent binuclear complexes in which the Sb atoms are bridged by a F atom (F_b) and by a trifluoroacetato-group.The distorted octahedral co-ordination at each Sb centre is completed by four terminal F atoms (F_t).The mean bond distances are: Sb-F_b 2.025(21), Sb-O 2.026(23), and Sb-F_t 1.836(24) Angstroem.The heavy atoms have been located directly and full-matrix least-squares refinement with anisotropic thermal parameters for the Sb atoms has given R=0.090 with 1 791 independent observed reflections.Title compound (2), Sb2O(O2CCF3)2F6, crystallizes in the monoclinic space group Cc with a=12.322(6), b=13.867(8), c=9.443(5) Angstroem, β=122.75(5) deg, and Z=4.The two Sb atoms are bridged by an oxygen atom (O_b) and by two trifluoroacetato-groups with the octahedral co-ordination at Sb completed by terminal fluorines (F_t).The binuclear complex has approximate C_2v symmetry and exhibits the following mean bond distances: Sb-O_b 1.893(21), Sb-O 2.064(16), and Sb-F_t 1.840(17) Angstroem.The analysis is based on 1 760 independent observed reflections and refined by weighted full-matrix least-squares analysis to R=0.043.

Full text of DOI:10.1039/DT9800000109

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