Synthèse et étude structurale par diffraction des rayons X sur monocristal de nouveaux complexes et polymères de coordination à base d’hétérocycles

Abstract

The present work, has been performed at the research unity URCHEMS (research unity of environment and structural molecular chemistry) and also, at the department of chemistry of the university Constantine 1. The matter is, to synthesize under hydrothermal conditions, an interesting coordination polymers with an organic ligand and a transition metal. These syntheses allowed us to obtain the next four compounds: ► Catena[(chloro)- µ1,2,4- triazolato) zinc(II)]n, ► Catena [(chloro)- bis-( µ1,2,4- triazolato) dizinc(II)]n, ► Catena [aqua-chloro-µ3-carboxypyrazinato) cuivre(II)]n, ► Catena [aqua-chloro- bis-(µ3-carboxypyrazinato) cobalt(II)]n. The structural analysis by x-ray diffraction of polymers named above revealed that: - they crystallize respectively with groups of field systems: P21/n of monoclinic system, Pnma of orthorhombic system, P21/n (monoclinic) et P212121 (orthorhombic). - that the triazole and pyrazinecarboxylato ligands are radical ligands X. - the ligand 1,2,4 triazolato is bonded to the metal by three N atoms, booth in the first two compounds, to generate respectively a two, three-dimensional networks. - The pyrazinecarboxylato is bonded to different metals Cu and Co respectively, by three and two atoms, to generate a three, two dimensional networks. - the junction between layers is assured by low, moderate and strong hydrogen bonds.