title: Synthesis, spectral, thermal and thermodynamic studies of oxovanadium(IV) complexes of Schiff bases derived from 3,4-diaminobenzoic acid with salicylaldehyde derivatives.
abstract: Synthesis and evaluation of three new oxovanadium(IV) complexes, formed by the interaction of vanadyl acetylacetonate and the Schiff bases: 3,4-bis((E)-2-hydroxybenzylideneamino)benzoic acid (L(1)), 3,4-bis-((E)-2-hydroxy-3-methoxybenzylideneamino)benzoic acid (L(2)) and 3,4-bis((E)-2,4-dihydroxybenzylideneamino)benzoic acid (L(3)) in methanol. The complexes have been characterized and studied by IR spectra, UV-Vis spectroscopy and thermogravimetry in order to evaluate their thermal stability and thermal decomposition. According to the results discussed from TG curves, the order of thermal stability for the complexes is VOL(3)>VOL(1)>VOL(2). Their formation constants (Kf) were obtained by UV-Vis spectroscopic titration at 15, 25, 35 and 45 °C in methanol by SQUAD software. The trend of formation constants of the complexes as follows: VOL(3)>VOL(2)>VOL(1).
authors: Chemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Islamic Republic of Iran. Khmohammadi@pgu.ac.ir
authors: Khosro
authors: K
authors: Mohammadi
authors: Mahmood
authors: M
authors: Niad
authors: Amene
authors: A
authors: Irandoost
mesh_terms: D000447:Aldehydes / Q000138:chemical synthesis / Q000737:chemistry*; D062365:Aminobenzoates / Q000138:chemical synthesis / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D012545:Schiff Bases / Q000138:chemical synthesis / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics; D013818:Thermogravimetry; D014638:Vanadates / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D000447:Aldehydes; D062365:Aminobenzoates; D056831:Coordination Complexes; D012545:Schiff Bases; C013243:salicylaldehyde; C075743:oxovanadium IV; C041192:3,4-diaminobenzoic acid; D014638:Vanadates