X-Ray crystal structure of antimony trichloride difluoride

Abstract

An X-ray crystallographic analysis indicates that SbCl,F, exists as a cis-fluorine-bridged tetramer giving a distorted octahedral arrangement of halogen atoms around each antimony atom.

The preparation and characterisation of Sb3Cl11F4

“…The bridges between Sb(1) and Sb(2), and Sb(2) and Sb(3) are both symmetric (meal Sb-1-= 2.08 A) whereas that between SbQ1) and Sb (3) F, (9), and SbC1,F (8) The CI-F disorder has already been discussed in the section concerning the refinement of the structure. The Sb-CI(F) bond length, 2.12 A, is approximately the value expected for a site consisting of 75% chlorine and 25% fluorine.…”

“…However, a phase change is thought to occur at low temperatures, resulting in a different structure. Although a number of structures have been postulated (3)(4)(5)(6)(7)(8)(9), Mossbauer evidence at 4 K suggests a trigonal bipyramidal arrangement of chlorine atoms around antimony (6). SbF, (7), SbC1,F (81, and SbC13F, (9) have all been shown by X-ray crystallography to exist as cis fluorinebridged tetramers.…”

“…Although a number of structures have been postulated (3)(4)(5)(6)(7)(8)(9), Mossbauer evidence at 4 K suggests a trigonal bipyramidal arrangement of chlorine atoms around antimony (6). SbF, (7), SbC1,F (81, and SbC13F, (9) have all been shown by X-ray crystallography to exist as cis fluorinebridged tetramers. Two other chlorofluorides, SbC12F3 (10) and Sb3C14Fll (11) We now report the preparation and characterisation of Sb3Cl,,,,F,,3 which has a previously unreported trimeric structure.…”