The 125Te Mössbauer Absorption Spectra of the Thiourea, Ethylenethiourea, and Tetramethylthiourea Derivatives of Tellurium(II) and Tellurium(IV)

Abstract

The ¹²⁵Te Mössbauer spectra of a number of Te(II) and Te(IV) complexes of thiourea and related derivatives have been measured. The isomer shifts and quadrupole splittings for several of the compounds are interpreted in terms of a bonding scheme utilizing three-center, two-electron bonds in which the tellurium 5p orbitals participate. The ¹²⁹I Mössbauer spectrum of trans-TeEtu₂¹²⁹I₂ is reported and the isomer shift and quadrupole splitting are shown to be consistent with the proposal that the iodine uses only a 5p orbital in bonding to the tellurium.