Study of structure of bis(triphenylstannyl) chromate(VI) by infrared, Mössbauer, and 1H, 13C and 119Sn NMR spectra

Abstract

The infrared, Mössbauer, and 1H, 13C and 119 Sn NMR spectra have been used to study the structure of bis(triphenylstannyl) chromate(VI) in solid state and in solvents of both noncoordinating and coordinating types. In solid state the compound forms a three-dimensional polymer: the tetrahedral CrO4 group and trans-trigonally bipyramidal (C6H5)3SnO2 grouping are connected mutually symmetrically by bridges represented by the common oxygen atoms. The three phenyl groups in the (C6H5)3SnO2 grouping are located in the equatorial plane of the trigonal bipyramide which is completed by two bridge oxygen atoms in axial positions. Solutions in noncoordinating solvents contain monomeric bis(triphenylstannyl) chromate(VI). The ester molecule contain two tetrahedral, (C6H5)3SnO groups bound by oxygen bridges to a CrO4 group which shows the C2v symmetry. In coordinating solvents the title compound forms a molecular complex having the coordination number 5 at the central tin atom.