Ligating Properties of 4-Acyloxime-2-pyrazolin-5-ones with Chromium(III)

Abstract

The ligating properties of 4-acyloxime-1-phenyl-3-methyl-2-pyazolin-5-ones (acyl = acetyl, propionyl, butyryl, chloroacetyl) and 4-acyloxime-1-(3′-chloropheny1)-3-methyl-2-pyrazolin-5-ones (acyl = formyl, acetyl, benzoyl and propionyl) with chromium(III) have been studied. The chromium(III) chelates have been synthesized and characterized on the basis of elemental analysis, electrical conductance, electronic and infrared spectra and magnetic susceptibility measurements. The oximes form the chelates of the type CrL₃. The chelates have magnetic moments close to the spin only values. The infrared spectra of the chelates reveal the retention of the oximino proton. The coordination sites of the ligands have been determined from ν_C=N (oxime) and ν_C-O. The chelates non-electrolytes in DMF and are octahedral.