Syntheses, Structural Characterization, and Thermal Properties of New 1,2,3,4-Tetrahydroquinazoline Ligands and Their Co(III) Complexes

• Published in: Inorganic and nano-metal chemistry 2014-05, Vol.44 (5), p.627-633
• Main Authors: Gençkal, H. Mutlu, Pazarli, N., Irez, G.
• Format: Article
• Language: English
• Subjects: 2-(3-bromo-phenyl)-1,2,3,4-tetrahydro-quinazoline-2-carbaldehyde oxime; 2-(3-chloro-phenyl)-1,2,3,4-tetrahydro-quinazoline-2-carbaldehyde oxime; Amine−imine−oxime; Chemical synthesis; Co(III) complex; Differential thermal analysis; Ligands; Magnetic permeability; Ring opening; Spectral methods; Structural analysis; Thermodynamic properties
• ISSN: 1553-3174; 2470-1556; 1553-3182; 2470-1564
• DOI: 10.1080/15533174.2013.783870

In this study, new heterocyclic ligands, 2-(3-chloro-phenyl)-1,2,3,4-tetrahydro-quinazoline-2-carbaldehyde oxime,(HL 1 ) and 2-(3-bromo-phenyl)-1,2,3,4-tetrahydro-quinazoline-2-carbaldehy- de oxime,(HL 2 ), and Co(III) complexes of their open-chain tautomer,(HL 1 ′ and HL 2 ′), containing oxime, imine, and amine donor groups resulting from the reactions with Co(II) ion have been synthesized and characterized by spectral methods, elemental analysis, magnetic susceptibility, and thermal analysis (TG, DTG, and DTA) techniques. The obtained results show that the ligands undergo a ring-opening reaction upon complexation with Co(III) ion. The analyses confirmed the following molecular formulae: [Co(L 1 ′) 2 ]Cl.H 2 O and [Co(L 2 ′) 2 ]Cl.H 2 O.