Jp. Kirby et al., FORMATION OF PORPHYRIN DONOR-ACCEPTOR COMPLEXES VIA AN AMIDINIUM-CARBOXYLATE SALT BRIDGE, Tetrahedron letters, 36(20), 1995, pp. 3477-3480
Porphyrins have been modified with an amidine functional group and the
y have been shown to bind carboxylic acids to form a amidinium-carboxy
late salt bridge. These systems offer a new model to probe the mechani
sm of proton-coupled electron transfer (PCET).