Abstract: | 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. |