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Synthesis, Spectral and Thermal degradation Kinetics studies of Benzimidazole substituted Metal phthalocyanine through oxadiazole Bridge (M=Co,Ni,Cu)

Author Affiliations

  • 1Dept. of Studies and Research in Chemistry, Kuvempu University, Janna Sahyadri, Shankaragatta-577451, Shimoga District, Karnataka, INDIA

Res.J.chem.sci., Volume 3, Issue (11), Pages 36-46, November,18 (2013)


In this study, new type of benzimidazole substituted metal Phthalocyanine complexes connected by oxadiazole bridge were prepared by the acid catalysed melt condensation of hydrazides with tetracarboxy metal Phthalocyanine in the presence of PPA. Which in turn, tetracarboxy metal Phthalocyanines and 2-(2-substituted-1H-benzimidazol-1-yl)acetohydrazide were synthesized by suitable modification of reported procedure. Novel dark green coloured 1,8,15,22-Tetra-[1-(1,3,4-oxadiazol-2-ylmethyl)-1H-benzimidazole] M(II) Phthalocyanine (M=Co,Cu,Ni) were characterized by elemental analysis, UV-Vis and IR-Spectroscopic techniques. Thermal stability of newly synthesized phthalocyanine complexes were investigated by means of thermogravimetric analysis (TGA). On basis of the TGA data, the kinetic and thermodynamic parameters such as activation energy (Ea),order of reaction (n), entropy change (ΔS), free energy (ΔG), enthalpy (ΔH) and frequency factor (A) were calculated using Broido’s method.


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