Electron-transfer reactions in an H-bonded assembly composed of a diacylaminopyridine bearing zinc porphyrin and 1, 8: 4, 5-naphthalenetetracarboxylic diimide (Ka= 2.8× 102 dm3 mol–1) in benzene occur with kCS= 4.1× 1010 s–1 and kCR= 3.7× 109 s–1, while the corresponding covalently linked model with a comparable distance and energy gap undergoes electron transfer with kCS= 9.9× 1010 s–1 and kCR= 6.7× 108 s–1.
