Arhitectura compușilor coordinativi ionici ai Fe(III) cu hidrazone în baza 2,6-diacetilpiridinei

Abstract

This paper represents a generalize investigation about four mononuclear coordination compounds of Fe(III) based on 2,6-diacetylpyridine and isonicotinic/nicotinic hydrazides were prepared and investigated, using different synthetic methods and conditions: [Fe(H2L 1 )(H2O)2](NO3)3∙1,5H2O (1), [Fe(H2L 2 )(H2O)2](NO3)3∙5H2O (2) [1], [Fe(H2L 1 )(H2O)1,5(CH3OH)0,5](ClO4)3∙1,75H2O (3) and [Fe(H2L 2 )(H2O)2](ClO4)3∙H2O (4) [2], (where H2L 1 = 2,6- diacetylpyridine bis(isonicotinoylhydrazone) and H2L 2 = 2,6-diacetylpyridine bis(nicotinoylhydrazone). The complexes were investigated using IR spectroscopy and single-crystal X-ray diffraction. It was established that metal adopts a pentagonal bipyramid configuration. Compounds 1-4 constitute ionic crystalline structures, formed by complex cations, NO3 - /ClO4 - anions and solvated water molecules. The pentadentated organic ligands (N3O2),adopt a double zwitterion tautomeric form and coordinate as neutral ligands. The crystal packings of compounds 1-4 show some types of noncovalent intermolecular interactions that lead to the formation of different structural architectures.