MOLECULAR-STRUCTURE OF AN OBLIQUE BIS-ZINC PORPHYRIN 1,10-PHENANTHROLINE MODEL OF A FRAGMENT OF THE PHOTOSYNTHETIC REACTION-CENTER

The crystal and molecular structure of an oblique bis-zinc porphyrin 1 -1 0 phenanthroline has been solved. Its geometrical features, regula r spacing and tilt angles of the porphyrin rings of independent units in the crystal cell are compared to the chromophore arrangement found in the Photosynthetic Reaction Centre. The present situation displays analogy with the mutual disposition of the pair of chromophores partic ipating in the primary electron transfer process: a bacteriochlorophyl of the special pair and a bacteriopheophytin.