Organotin(IV) Complexes of Some 2-Pyrazoline Derivatives, Part (II): PhSnCl3 and SnCl4 Complexes

Abstract

The reactions of PhSnCI₃ and SnCI₄ with 2-pyrazoline derivatives(L) in a 1 : 1 molar ratio have been described. The complexesPhSnCI₃ . L  and PhSnCI₄ . L have been identified by C,H,N elementalanalyses, IR and NMR spectroscopy. The spectral data of someof the complexes formed show that the 2-pyrazoline derivative istautomerized, during the reaction, to the most stable hydrazone formand the later coordinates with tin compounds via N-N linkage andnot via N2 and CO sites of the hydrazone. This has been confirmedby preparing some chroman-4-one complexes of PhSnCI₃ and SnCI₄and comparing their IR spectra with those of hydrazone ones.Almost all the complexes prepared show some 1 : 1 conductivityin both solvents, acetonitrile and DMF, indicating the presence ofionic species [PhSn(L)Cl₂]CI and [Sn(L)CI₃]CI.