SYNTHESIS OF NOVEL PORPHYRINS via Pd CATALYZED COUPLING REACTIONS FOR MATERIAL APPLICATIONS

Abstract

Porphyrins are having wide applications in the field of catalysis, photodynamic therapy (PDT), dye-sensitized solar cells (DSSC), gas storage materials and molecular sensors. The wide applications of metalloporphyrin derivatives prompt the laboratory synthesis and their functionalisation. 2,3,5,7,8,10,12,13,1 5,17,1 8,20_dodecaphenylporphyrin (l-I2DPP) and its Ni(I1) and Zn(II) complexes have been synthcsised and characterized by UV-Visible, fluorescence, 'H NMR and mass spectroscopic techniques. UV-Visible spectrophotometric titration of porphyrin with fullerene C60 suggests that there is an effective interaction between porphyrin and fulicrene C60. The decrement in the emission intensity of the porphyrin while increasing concentration of fullerene strongly also suggests that the host-guest complexation between porphyrin (donor) and fullerene (acceptor) due to effective it-it interaction intern IL leads to the charge-separated state. The electronic spectral studies in solution clearly demonstrated that there is an effective interaction and possibly electron transfer from donor to acceptor. FI2T(j3phosphory11Th)1 and their metal complexes have been synthsised and characterized by spectroscopic techniques. The electronic absorption spectral features are comparable to MTPP derivatives. The CuTp-phosphorylPh)P and NiTp-phosphorylPh)P have shown cathodic shift (- 100-200 mV) in their redox potentials due to effective electron withdrawing nature of phosphonic ester groups.