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The interaction of SnCl4 with benzoyl-(salicyloyl) hydrazones of benz-(HBb, 2-OHHBb) and p-dimetilaminobenz- (HBdb, 2-OH-HBdb) aldehydes in acetonitrile have been studied. It has been shown, that with HBb the initial hydrazone(1) and with other hydrazones have been isolated complexes [SnCl4(2-OH-HBb)]⋅1,5CH3CN (2), [SnCl4(Bdb⋅H)] (3), [SnCl4(2-OH-Bdb⋅H)] (4), the composition and structure of which is determined by methods of elemental analysis, conductivity measurements (in nitrobenzene), as well as methods of thermogravimetry, electronic and IR spectroscopy. It has been shown, that in (2-4) is implemented bidentate O(C = O/CO), N(CH = N) coordination of ligand with the stabilization of both the ketone (OC = O, 2), and enolic (OC-O, 3, 4) forms. In 3, 4 the negative charge is located on the coordination site of tin is compensated due to protonation of the tertiary nitrogen atom of aldehyde fragment.