Synthesis and Characterization of a Novel Porphyrin

Abstract

The copper complex of the novel porphyrin 5,10,15,20-tetrakis-(3,4-bis-benzyloxy-phenyl) porphyrin, TDBOPP, was synthesized. The CuTDBOPP was purified using column chromatography and then characterized by electronic absorption spectrophotometry. The spectral data were in agreement with the proposed structure. The UV-Vis absorption spectrum of TDBOPP shows characteristic spectral patterns similar to those of tetraphenyl porphyrin with a Soret band at 424 nm and four (or three) Q bands at 519, 556, 592 and 650 nm. The copper complex exhibited a shift in the Soret band to 421 nm and the extinction coefficient for the Soret band was 4.3 x 105 cm-1M-1. Also observed was the disappearance of some of the Q bands as was expected upon metallation of porphyrin. The Q bands were 541 and 578 nm and had corresponding extinction coefficients of 2.2 x 104 cm-1M-1 and 4.5 x 103 cm-1M-1.