Gas-phase electron diffraction study of tetrafluoro(seleno)tungsten(VI), WSeF4

Abstract

The molecular structure of WSeF₄ has been determined by gas-phase electron diffraction with a nozzle temperature of 130 °C. The experimental data are in agreement with a C_4v square-pyramidal model being present in the gas phase in which the tungsten atom is above the plane of the four fluorine atoms. The distances and angles are r_a(WSe)= 2.226(7), r_a(W–F)= 1.853(5)Å, Se–W–F 105.0(7), F–W–F 86.1(4)°. The errors are 2σ, plus estimates of correlation in the experimental data and uncertainties in the electron wavelength.