COORDINATION COMPOUNDS OF TIN(IV) WITH HYDAZEPAM AND PRODUCTS OF ITS CONDENSATION WITH ARYLALDEHYDES

Abstract

Reaction of tin tetrachloride in a 2-propanol solution and 2-(7-bromo-2-oxo-5-phenyl-3H- 1,4-benzodiazepin-1-yl)acetohydrazide (“gidazepam”, hydazepam – HHy) made it possible to obtain for the first time the corresponding tin coordination compound [Sn(HHy)Cl4] (I). A synthetic technique of the template synthesis has been developed and a novel coordination compounds [Sn(HHySl)Cl3] (II), [Sn(HHySlNO2)Cl3] (III), [Sn(HHy2Nf)Cl3] (IV), [Sn(HHy2NfBr)Cl3] (V) in the systems HHy–(HSl, HSlNO2, H2Nf, H2NfBr)–SnCl4–2-propanol, where HSl is 2-hydroxybenz-, HSlNO2 – 2-hydroxy-5-nitrobenz-, H2Nf – 1-hydroxy- 2-naphth-, H2NfBr – 4-bromo-1-hydroxy-2-naphth-aldehydes, have been synthesized. They are crystalline substances readily soluble in DMF and acetonitrile and moderately soluble in ethanol. The composition and structure of the complexes were confirmed by a number of physicochemical methods: elemental analysis, electrical conductivity, mass spectrometry, IR spectroscopy and thermogravimetry. The measurement of the electrical conductivity of solutions of the I−V in DMF has shown that they all are non-electrolytes. It was found by the thermogravimetric method that the thermolysis of complexes I−V proceeds uniformly and is stepwise in nature. The presence of peaks of molecular ions of the corresponding hydrazones in the mass spectra of complexes II−V obtained by template synthesis confirmed the formation of these hydrazones and the participation in coordination to the Sn4+ ion in the reaction course. Tin(IV) coordination polyhedron in all complexes is the octahedron formed by: four chlorine atoms, the nitrogen atom of the hydrazide amino group and the oxygen atom of the ligand carbonyl group in I; three chlorine atoms, azomethine nitrogen atom and two oxygen atoms of the carbonyl and deprotonated hydroxy group of the ligand in II−V.

Keywords

• тетрахлорид стануму, гідазепам, гідразони, координаційні сполуки, темплатний синтез