Influence of structural factors on the spectral and luminescence properties of metalloporphyrins

On the basis of a study of the influence of alkyl substitution on the absorption spectra of metalloporphyrins, the nodal properties of the optical electrons, obtained in the MOLCAO method, have been confirmed. It has been established that alkyl substituents have a comparatively marked influence on the phosphorescence yield. In a study of the influence of additional complex formation on the phosphorescence, it has been shown that the effect of conjugation plays a significant part in removing the intercombination exclusion when heavy atoms are present in the molecule. It has been concluded that the D_4h symmetry of the conjugated system is preserved approximately in the pyridinates of Mg porphyrins. Phosphorescence of associates of Cu porphyrins has been detected.Presented at the Second All-Union Conference on the Use of Physical Methods in the Chemistry of Complex Compounds (Kishinev, October 1965).