Electronic emission spectroscopy of certain metallo mesoporphyrins and phthalocyanines

The low temperature emission spectra of the dimethyl ester.of mesoporphyrin IX and its Co(II)t Ni(II), Cu(II), Zn(II), Pd(II), and Cd(II)-derivatives have been obtained. The emission characteristics of Ag(II) derivative were investigated; however, no emission bands could be detected. The spectral properties of these compounds are discussed in terms of the degree of spin-orbital coupling present in such molecules. Several predictions are made regarding the magnetic character of the central metal ion and the metal-porphyrin geometry present in these porphyrin molecules. In addition, a comparison is made of the intensities of the fluorescent spectra of Zn-mesoporphyrin with Zn-phthalocyanine. This indicates that there is a decrease in the sire of the area between the pyrrole rings of the former molecule compared to the latter.