مشخصات پژوهش

Hydrazones are an important class of Schiff bases that are considered as one of the most extensively utilized ligands for the development of coordination chemistry of transition metals. This matter is related to their easy way of preparation, structural divergence, and solubility in commonly available solvents [1-3]. These are illustrious from the other members of the same class due to the existence of interlinked nitrogen atoms (-C(O)-NH-N=CH-) and can coordinate with the metal atoms in both neutral and deprotonated forms [4]. Picolinohydrazide, by having a pyridine ring connected to the hydrazone unit is one of the attractive compound for preparing diatopic Schiff base ligands. In this research, we report the synthesis, characterization and Hirschfield surface analysis of Zn(II) complexes with (E)-N'- (1-(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl) ethylidene) picolinohydrazide. Tetranuclear zinc complex was synthezied in methanol solvent and its crystals were obtained by slow sovlent evaporating method. The obtained complex was characterized by spectroscopic methods and single crystal X-ray analysis which revealed it is a tetranuclear acetato-bridged Zn(II) complex and the picolinohydrazone ligand act as both bridging and chelating ligand. This copmpound is crystallized in monoclinic system and there are strong intermolecular interactions. The zinc ions are five coordinated and the acetato ligands act as briding group between metal cores. Intermolecular interactions in this compound were studied by Hirschfeld surface analysis. This analysis indicated there are strong C–H···O. O–H···O and O–H···N interactions in the crystal structur of the Zn(II) cluster.