Spectroscopic and Thermal Studies on Solid Complexes of 4-(2-pyridylazo)resorcinol with Some Transition Metals

Fatma Karipcin* and Eser Kabalcilar

Chemistry Department, Faculty of Sciences and Arts, Süleyman Demirel University, 32260 Isparta, Turkiye
Tel: + 90 246 2114112;
Fax: +90 246 2371106
E-mail: karipcin@fef.sdu.edu.tr

The preparation and characterization of MnII, FeII, CoII, NiII, CuII, ZnII and CdII chelates of 4-(2-pyridylazo)resorcinol, H2L (PAR) were reported. The solid complexes were characterized by elemental and thermal analyses, IR, molar conductance, magnetic measurements. All complexes were found to have the formulae [M(HL)2]. The 1 : 2 (M : L) complexes showed octahedral geometry around MII. The molar conductance data reveal that the chelates are non-electrolytes. IR spectra show that the ligand is coordinated to the metal ions in a terdentate manner and complexation with 4-(2-pyridylazo)resorcinol through the resorcinol OH, azo N and pyridyl N. In particular, the thermal decomposition of all the complexes of PAR is studied in nitrogen atmosphere. The final decomposition products are found to be the corresponding metal or metal oxides.

Keywords: Azo complexes; resorcinol; PAR; magnetic moment; thermal analysis Figure 1. 4-(2-pyridylazo)resorcinol, H2L.