Synthesis and physico-chemical characterization of metal free, sodium and potassium phthalocyanine complexes

Sodium phthalocyanine (Na2Pc), potassium phthalocyanine (K2Pc) and hydrogen phthalocyanine (H2Pc) are synthesized in pure state. These complexes are characterized using physico-chemical methods like electronic, IR spectral, magnetic susceptibility measurements, thermogravimetric analysis and X-ray powder diffraction studies. Kinetic and thermodynamic parameters associated with the thermal decomposition were calculated using thermogravimetric analytical data. X-ray diffraction studies revealed that these complexes are having monoclinic crystal lattice structure. Electrical conductivity studies are carried out using two-probe technique in the temperature range 298–473 K for each complex. Sodium phthalocyanine showed semiconducting behavior, whereas potassium phthalocyanine showed first metallic behavior in the temperature range 300–378 K and then semiconducting property in the temperature range 383–473 K. But hydrogen phthalocyanine showed semiconducting behavior in the temperature range 300–390 K and metallic conduction behavior in the temperature range 395–473 K.