Synthesis, characterisation, and copper(ll)-assisted P - N bond cleavage of bis(3,5-dimethylpyrazolyl) chlorophosphine oxide and isolation and characterisation of 3,5-dimethylpyrazole complexes of copper(II)

Abstract

A new mixed pyrazolyl phosphine oxide ligand, viz., bis( 3,5-dimethylpyrazolyl) chlorophosphine oxide (1) has been prepared from the reaction of POCI, and 3,5- dimethylpyrazole. The compound (1) has been characterised by elemental analysis, IR, UV-visible, ¹H and ¹³C NMR spectroscopy. The ligand undergoes smooth P- N bond cleavage when reacted with Cu(II) in EtOH medium and copper(II) complexes of the type [Cu(DMPZ)₂X₂] (DMPZ = 3,5-dimethylpyrazole; X-Cl^- or CH₃COO ^-) have been isolated which have been characterised by elemental analyses, IR, UV-visible, magnetic and EPR measurements.