Synthesis and characterization new tetra-3-chlorobenzothiophene-[1,3,4]-oxadiazole appended metallophthalocyanines for dielectric studies

New 3-chlorobenzothiophene-1,3,4-oxadiazole substituted metallophthalocyanines have been efficiently synthesized by the reaction of tetracarboxy metallophthalocyanines with 3-chlorobenzothiophene acid hydrazide. The structural integrity of the peripherally substituted metallophthalocyanine complexes were elucidated by elemental analyses, FT-IR, solid state electronic absorption spectroscopy and solid state ¹³C NMR spectroscopy. In addition, powdered X-ray diffraction (XRD) and thermo gravimetric analysis (TGA) were also performed to realize crystallographic nature and thermal stability. Further the dielectric constant (ε¹) and AC conductivity (σ_ac) of BTHPcs was also studied. The variation of capacitance (C_s), loss tangent (tan δ) and impedance (Z) with frequency range of 50 to 5x10⁶ Hz was observed at room temperature and it clearly shows that all these complexes carousing that non-Debye type relaxation caused by hopping charges may relevant for the dielectric responses.