TIN AND GERMANIUM COMPLEXES WITH MALTOL

Abstract

The reaction of tin and germanium tetrachlorides with 3-hydroxy-2-methyl-4H-pyran-4-one (HMa) in benzene yielded M(HMa)₄Cl₄·C₆H₆ (M = Sn or Ge) adducts, whereas in methanol the MMa₂Cl₂ complexes have been isolated. Moreover, tin complexes with the neutral donors 2,6-dimethyl-4H-pyran-4-one (DMP) and 2,6-dimethyl-4H-pyran-4-thione (DMTP), having formulae Sn(L)₂Cl₂ and Sn(L)₂Cl₄(L = DMP or DMTP) have been prepared. The compounds have been characterized by ir and proton nmr spectroscopy and by thermogravimetric (TG and DTA) analysis. The thermal behaviour of all complexes has been followed to 1200°C. The stability of the M(HMa)₄Cl₄ adducts in various solvents is discussed on the basis of proton nmr spectra.