Electron transfer in a hydrogen-bonded assembly consisting of porphyrin–diimide

Abstract

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