Synthesis and Characterization of Some Tin(IV) and Organotin(IV) Derivatives of 1-Phenyl-3-Methyl-4-Aroyl-5-Pyrazolones

Abstract

Abstract Stable, six-coordinated (Q)2RSnX complexes (X = R or Cl, R = Cl, Me, Ph, or n-Bu; QH is l-phenyl-3-methyl-4-R′C(=O)-pyrazol-5-one, where R′ = p-CH3OC6H4 or p-NO2C6H4) have been synthesized and characterized by their analytical data, IR, 1H, 13C and 119Sn NMR spectra. They are not fluxional when X = C1 or Ph. The 119Sn NMR chemical shift is a function of the number of chloride groups. The spectral data are consistent with an octahedral geometry around tin(IV) in which the pyrazolonato acts as a monoanionic bidentate ligand coordinating through both the carbonyl groups.