Abstract
The mononuclear Ni(II) complex [Ni(Lp)2(CH3OH)2]Cl2 has been synthesized by reacting 1-(5-hydroxy-3-methyl-5-phenyl-4,5-dihydro-1H-pyrazol-1-yl)ethan-1-one ligand (HL) with NiCl2·6H2O in methanol solution. In the reaction, the tridentate ligand, HL, was converted in situ into 4-hydroxy-4-phenylbut-3-en-2-ylidene)acetohydrazid ligand, (pyrazole, Lp). The pyrazole ligand acts as bidentate neutral ligand and the hydroxyl group is left uncoordinated. The structure of the Ni(II) complex has been established by X-ray crystallography. The Ni(II) is six-coordinate and has a distorted octahedral geometry. It is bonded by two nitrogen and by two oxygen atoms of the two pyrazole ligands and two oxygen atoms of methanol molecules. The Hirshfeld surface analysis and the 2D the fingerprint plot are used to analyses all of the intermolecular contacts in the crystal structures. The main intermolecular contacts are H/H and Cl/H interactions.
Highlights
The complexation of transition metal ions with multidentate Schiff base ligands has been studied extensively as their structures can be divers and they can have versatile properties.[1,2,3] The hydrazone ligands which are formed by condensation reactions between hydrazide derivatives and relevant aldehyde or ketones, are a signification class of such multidentate ligands
Lp coordinates to the Ni(II) center, acting as a neutral bidentate ligand and leading to an unexpected product, (Ni(Lp)2(CH3OH)2]Cl2
The reaction of copper(II) salts with this ligand did not lead to a cyclization reaction, and the copper complexes which were formed have the ligand acting as a monoanionic tridentate species, i.e. [CuLX]
Summary
The complexation of transition metal ions with multidentate Schiff base ligands has been studied extensively as their structures can be divers and they can have versatile properties.[1,2,3] The hydrazone ligands which are formed by condensation reactions between hydrazide derivatives and relevant aldehyde or ketones, are a signification class of such multidentate ligands Metal complexes with these ligands can have a wide range of structures with significant variations in geometry.[3,4,5,6,7] the cyclization reaction of hydrazide precursors may take place and lead to the formation of pyrazole ligands.[8,9,10] The pyrazole compounds themselves are hydrolytically and thermally stable and can act as a mono- or bidentate ligands. A search of the literature revealed that the pyrazole had been reported previously by Wang et al and Alberola et al and crystal structure has been determined.[16,17] Pyrazole has been prepared by the reaction of 1-phenylbutane-1,3-dione and acetohydrazide in the presence of a catalytic amount of acid under solventless conditions[16] or in solvent.[17]
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