Abstract
Copper(II) chelates of salicylaldehyde aroylhydrazones [H 2Sal-R] and acetylacetone aroylhydrazones [H 2Acac-R] have been prepared. Elemental analyses, infrared and electronic spectra as well as the magnetic susceptibility measurements are used for their characterisation. A distorted square pyramidal structure is tentatively assigned for chelates of the type [Cu(H SalR)CI · X] (X = H 2O or pyridine), whereas the anhydrous chelates [Cu(H Sal-R)Cl] possess square planar arrangement with the chloride ion occupying a coordination site. In both types the hydrazone molecule acts as a monobasic tridentate ligand. The neutral chelates [Cu(Sal-R)] and [Cu(Acac-R)] on the other hand, possess subnormal magnetic moments and may achieve square planar structure through molecular association. In these chelates, the hydrazone molecule acts as a dibasic tridentate ligand. Their interaction with pyridine afforded the monomeric monopyridinate adducts.
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