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Synthesis, characterization, electrochemical and solvatochromic investigations of novel monomeric and polymeric vanadyl schiff-base complexes

Boghaei, D. M ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. DOI: 10.1080/00958970600989699
  3. Publisher: 2007
  4. Abstract:
  5. This article describes the synthesis and characterization of oxovanadium(IV) complexes containing tetradentate Schiff-base ligands derived from condensation of ethylenediamine, meso-1,2-diphenyl-1,2-ethylenediamine, 1,2-orthophenylenediamine and 1,2-cyclohexanediamine with 5-bromo-3-nitro-2- hydroxybenzaldehyde. The novel VOL1:[VO(5-Br-3-NO2salen)], VOL2:[VO(5-Br-3-NO2saloph)] and VOL3:[VO(5-Br- 3-NO2salchxn)] complexes were obtained in orange polymeric form with (V=O) stretching bands at 878, 884 and 884 cm-1, respectively, but the VOL4 complex was obtained as a green monomer with (V=O) stretching band at 978 cm-1. The redox process in acetonitrile was reversible for VOL4 and E° was determined to be approximately 950 mV but for VOL1-3 this process was irreversible or quasi-reversible. The VOL4 complex is considerably soluble in a wide variety of solvents and shows solvatochromic behavior. The 2B2 → 2 E(I) transition wavenumber shows a linear correlation to the D.N. of the solvent. © 2007 Taylor & Francis
  6. Keywords:
  7. Monomeric form ; Oxovanadium(IV) complexes ; Polymeric form ; Solvatochromism
  8. Source: Journal of Coordination Chemistry ; Volume 60, Issue 9 , 2007 , Pages 973-983 ; 00958972 (ISSN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/00958970600989699?journalCode=gcoo20