Porphyrins and Related Molecules of Biological Importance

As in previous years this section consists of a short account of recent developments in metalloporphyrin photochemistry and photophysics and a selective survey of the in vitro photochemistry of chlorophyll and haem. 

Vander Donckt, M. Lootens, D. Swinnen, and C. Haquin, Bull. Soc. chim. beiges, 1975, 84, 77. 

Kachura, A. N. Sevchenko, K. N. Solovev, and M. P. Tsvirko, Doklady Akad. Nauk 

The effect of heavy atoms on the relative yields of fluorescence and phosphorescence has been investigated both by inserting Br and I substituents in the ring of deuterioporphyrin IX and its Zn derivative,340 and by adding ethyl iodide to the solution of a number of free base porphyrins.341 Other authors discuss the luminescence of protoporphyrin IX dimethylester after pulse radiolysis in benzene,848 and from monomeric and dimeric ethylenediamine-substituted protoporphyrin IX and some metal derivatives.343 Several reports consider the emission from porphyrins in Shpolskii matrices and other crystalline organic hosts.344-340 

Electrochemiluminescence of (TPP)Pd and (TPP)Pt originates from their triplet states formed after recombination of the cation and anion.347 

---