Dimeric 5-coordinate oxovanadium(IV) complexes of tridentate benzoyl hydrazones |
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| Affiliation: | 1. Department of Chemistry, Abdul Wali Khan University, Mardan, Pakistan;2. Department of Chemistry, COMSATS Institute of Information Technology, Abbottabad-22060, Pakistan;3. School of Chemistry, University of Dublin, Trinity College, Dublin 2, Ireland;4. Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria;5. Department of Pharmaceutical Sciences, Kohat University of Science & Technology, Kohat, Pakistan;6. Chemistry Department, Rhodes University, Grahamstown 6140, South Africa;7. Institut für Biochemie, Ernst-Moritz-Arndt Universität Greifswald, Felix-Hausdorff-Straße 4, 17487 Greifswald, Germany;1. Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, VA 23529, USA;2. Department of Chemistry, University of the West Indies, Mona Campus, Kingston 7, Jamaica;3. Département de Chimie, Université de Montréal, Montréal, Canada;4. Department of Chemistry, University of North Dakota, 151 Cornell St., Stop 9024, Grand Forks, ND 58202-9024, USA;5. Department of Chemistry, Illinois State University, Campus Box 4160, Normal, IL 61790-4160, USA;6. Department of Chemistry, Clemson University, 379 Hunter Laboratories, Clemson, SC 29634, USA |
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| Abstract: | The oxovanadium(IV) complexes of the hydrazones derived from benzoylhydrazine and salicylaldehyde (BSH), o-hydroxyacetophenone (BAH), o-hydroxypropiophenone (BPH), o-hydroxybutyrophenone (BBH) and 2-hydroxy-1-naphthaldehyde (BNH) have been described. These complexes have been characterised by elemental analyses and by molecular weight, conductance, magnetic, IR and electronic spectral measurements. The IR spectra suggest the presence of phenoxide bridging and thus the complexes are formulated as dimers, each unit having 5-coordinate distorted square-pyramidal geometry. The low μeff values (1.02 – 1.26 B.M.) have been attributed to antiferromagnetic exchange coupling and the principal path for spin coupling is direct σ-metal-metal interaction. The electronic spectra have been interpreted in terms of energy level scheme delineated for distorted square-pyramidal geometry. Various ligand field parameters Dq, Ds, Dt along with NSH parameters DQ, DS and DT have been evaluated and the degree of distortion (DT/DQ) lies in the range 0.169 – 0.233. |
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