SYNTHESIS, ELECTRONIC, AND MAGNETIC PROPERTIES OF SOME 3-SUBSTITUTED 2,4-PENTANEDIONATOOXOVANADIUM(IV) COMPLEXES AND THEIR 4-METHYLPYRIDINE ADDUCTS

Abstract

Abstract Oxovanadium(IV) complexes of various 3-substituted 2,4-pentanediones [VO(H3CCOCHRCOCH3]2 where R = CH3, C2H5, i-C3H7, n-C4H9, i-C4H9, C6H5, CH3CO, C6H5CH2, have been synthesized and their adducts with 4-methylpyridine prepared. The compounds were characterized by elemental analyses, magnetic susceptibility, infrared and electronic spectral measurements. The infrared vanadyl stretching frequency ν(V = O) were observed in the range 940–998 cm−1 indicating the non-existence of polymeric structures. The infrared and electronic spectral studies indicate that the oxovanadium(IV) β-diketone complexes assume a square-pyramidal geometry while the adducts adopt a six-coordinate octahedral geometry. The effective magnetic moments (μeff) for the complexes at room temperature are between 1.71 and 1.76 B.M. indicating the compounds are magnetically dilute. Possible structures for the compounds are suggested. Acknowledgments