Antimony-121 Mössbauer spectroscopic studies of antimony dithiocarbamate complexes

Abstract

Fifteen antimony dithiocarbamate complexes and five related complexes have been studied using ¹²¹Sb Mössbauer spectroscopy. These include the series Sb(S₂CNEt₂)_3–nX_n(X = Cl, Br, or I; n= 0–3), SbR_n(S₂CNEt₂)_3–n(R = Me or Ph; n= 1 or 2), Sb(S₂CNBu₂)₃, Sb(S₂CNBu₂)₂L (L = 0.5Cd₂I₆ or I₃), SbMe₄(S₂CNEt₂), and SbMe₃(S₂CNMe₂)₂. Isomer shifts, quadrupole-coupling constants, and asymmetry parameters are used to discuss the antimony–ligand bonds and the structure. Four of the complexes studied contain Sb^V, while the others contain Sb^III. The sterically active lone-pair electrons are quite important in understanding the bonding and structural properties of the antimony(III) complexes.