Abstract
Co-ordination complexes of tin (IV) chloride with tetramethyl urea 1,3-dimethyl urea, 1,1-dimethyl urea and monophenyl urea have been prepared. They are of the type SnCl 4·2 Donor, as shown by indicator titration of stannic chloride against the donor molecules in dichloroethane. Molecular weight determinations by freezing-point depression and conductivity measurements in nitromethane show that they are monomeric molecular addition compounds. In infra-red spectra indicate oxygen to metal bonding and the relative values of the shift in γ(CO) and the melting points of the adducts indicate the following order for the donor strength: Terramethyl urea > 1,3-dimethyl urea > 1,1-dimethyl urea > monophenyl urea. Tetramethyl urea > 1,3-dimethyl urea > 1,1-dimethyl urea > monophenyl urea
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