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Synthesis, characterization, ab initio calculations, thermal behaviour and thermodynamics of some oxovanadium(IV) complexes involving O,O- and N,N-donor moieties

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Abstract

Some oxovanadium(IV) complexes, namely bis(1,1,1-trifluro-2,4-pentanedionato-O,O′) oxovanadium (IV), [VO(tfac)2(H2O)], bis(1-phenyl-2,4-pentanedionato-O,O′)oxovanadium(IV), [VO(phac)2(H2O)], bis(1,3-diphenyl-2,4-pentanedionato-O,O′)oxovanadium(IV), [VO(dphac)2 (H2O)], of the type [VO(O4)] and bis(pyrolidineaniline)oxovanadium(IV), [VO(pyran)2(H2O)], bis(p-hydroxypyrolidineaniline) oxovanadium(IV), [VO(p-hydroxypyran)2(H2O)], bis(p-methoxypyrolidineaniline) oxovanadium(IV), [VO(p-MeOpyran)2 (H2O)], bis(p-chloropyrolidineaniline)oxovanadium(IV), [VO(p-chloropyran)2(H2O)], bis(p-bromopyrolidineaniline)oxovanadium(IV), [VO(p-bromopyran)2(H2O)], bis(p-cyano pyrolidineaniline)oxovanadium(IV), [VO(p-cyanopyran)2(H2O)], and bis(pyrolidinebenzylamine) oxovanadium(IV), [VO(pyrbz)2(H2O)], of the type [VO(N4)] were synthesized and characterized by IR, UV-Vis, mass spectrometry, elemental analysis, magnetic moment and thermogravimetry in order to evaluate their thermal stability and thermal decomposition pathways. The number of steps and, in particular, the starting temperature of decomposition of these complexes depends on the equatorial ligand. Also, formation constants of the complexes have been determined by UV-Vis absorption spectroscopy through titration of the ligands with the metal ions at constant ionic strength (0.1 M NaClO4) and at 25°C. According to the thermodynamic studies, as the steric character of the ligand increases, the complexation tendency to VO(IV) center decreases. Also, the ab initio calculations were carried out to determine the structural and the geometrical properties of the complexes.

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Authors and Affiliations

  1. Chemistry Department, College of Sciences, Shiraz University, Shiraz, 71454, I.R. Iran

    Mozaffar Asadi, Mohammad Hadi Ghatee, Susan Torabi & Fatemeh Moosavi

  2. Chemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr, 75169, I.R. Iran

    Khosro Mohammadi

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  1. Mozaffar Asadi
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  2. Mohammad Hadi Ghatee
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  3. Susan Torabi
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  4. Khosro Mohammadi
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  5. Fatemeh Moosavi
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Correspondence to Mozaffar Asadi.

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Asadi, M., Ghatee, M.H., Torabi, S. et al. Synthesis, characterization, ab initio calculations, thermal behaviour and thermodynamics of some oxovanadium(IV) complexes involving O,O- and N,N-donor moieties. J Chem Sci 122, 539–548 (2010). https://doi.org/10.1007/s12039-010-0088-6

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  • DOI: https://doi.org/10.1007/s12039-010-0088-6

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