title: Synthesized some 4-(2-thiazolylazo)resorcinol complexes: characterization, thermal and optical properties.
abstract: Some transition metal complexes of the type [ML2].nH2O (n=0 or 2) of the title ligand, 4-(2-thiazolylazo)resorcinol, HL (TAR) have been synthesized and characterized by various analytical and physicochemical (elemental, thermal analyses, AAS, electrolytic conductance and magnetic susceptibility measurements) and spectral (UV-vis and IR) techniques for structure determination and optical properties. The complexes have the formulae [ML2] for M=Fe(II), Cu(II) and Zn(II); [CdL2].2H2O. An octahedral structure is proposed for all complexes. IR spectra show that the ligand is coordinated to the metal ions in a tridentate manner with ONN donor sites of the resorcinol OH, azo N and thiazole N. The effect of varying pH and solvent on the absorption behavior of the ligand and complexes has been investigated. The optical constants such as, refractive index, extinction coefficient, dielectric constant were determined for the ligand and its complexes. These parameters changed with different metal complexes. The optical absorption data revealed that the band gap of the films was direct transitions. The optical band gap and Urbach energy of the films were determined using the known theory. The optical dispersion parameters were determined according to Wemple and DiDomenico method.
authors.affiliation: Süleyman Demirel University, Faculty of Arts and Sciences, Department of Chemistry, 32260 Isparta, Turkey.
authors.forename: Fatma
authors.initials: F
authors.lastname: Karipcin
authors.forename: Eser
authors.initials: E
authors.lastname: Kabalcilar
authors.forename: Saliha
authors.initials: S
authors.lastname: Ilican
authors.forename: Yasemin
authors.initials: Y
authors.lastname: Caglar
authors.forename: Mujdat
authors.initials: M
authors.lastname: Caglar
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D004583:Electrons; D006863:Hydrogen-Ion Concentration; D015394:Molecular Structure; D012118:Resorcinols / Q000138:chemical synthesis* / Q000737:chemistry; D012997:Solvents; D013053:Spectrophotometry; D013696:Temperature
chemical_list: D001391:Azo Compounds; D012118:Resorcinols; D012997:Solvents; C026054:4-(2-thiazolylazo)resorcinol