Photoinduced Electron−Transfer in Porphyrin−quinone Cyclophanes, 15. Distance Dependence of Photoinduced Electron−Transfer: Syntheses and Structures of Naphthalene−Spacered Porphyrin−Quinone Cyclophanes

Syntheses, conformational and structural analyses of porphyrin−quinone cyclophanes 2 with naphthalene−spacers are presented and the findings are compared with data for previously investigated analogous benzene−spacered compounds 1. In combination with data for the biphenylene− and anthracene−spacered porphyrin−quinone cyclophanes 3 and 4, to be published in following papers, the results reported herein allow some appraisal to be made of the distance dependences of photoinduced electron−transfer from porphyrin to quinone unit