Photoinduced electron-transfer in porphyrin-quinone cyclophanes, 18 - Porphyrin-cyclophanes with 7,7,8,8-tetracyanoquinodimethane as an especially strong electron-acceptor: Syntheses, properties, electron-transfer interactions

Previous work on intramolecular electron-transfer compounds of the quinone- porphyrin cyclophane type with gradually increasing electron-acceptor stren gth was now extended to acceptor-porphyrin cyclophanes with 7,7,8,8-tetracy anoquinodimethane (TCNQ) as an especially strong electron-acceptor The vert ically stacked TCNQ-porphyrin cyclophane 1 was prepared in a multi-step syn thesis. Physical properties related to structure and electron-transfer proc esses of 1 are reported. To determine the distance dependence of the intera ction between the electron-acceptor TCNQ and the porphyrin, first results o n the synthesis of the corresponding naphthalene-spacered TCNQ-porphyrin cy clophane 15 are presented.