Journal
ACCOUNTS OF CHEMICAL RESEARCH
Volume 36, Issue 11, Pages 832-838Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ar0200549
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Ground and excited state processes induced by hydrogen bond formation are discussed for a family of heterocyclic compounds which possess both a proton donor (pyrrole NH group) and an acceptor (pyridine-type nitrogen). Excited state double proton transfer and rapid S-0 <-- S-1 internal conversion are observed only for molecules capable of forming cyclic, multiply hydrogen-bonded complexes. If the 1:1 cyclic, doubly hydrogen-bonded solvate is present in the ground state, the phototautomerization occurs even in rigid solvents at low temperatures. Internal conversion process requires solvent rearrangement and, therefore, does not proceed in a rigid environment. Another type of fluorescence quenching was also detected, involving photoinduced electron transfer from an excited chromophore to an aromatic hydrogen-bonded acceptor, such as pyridine. In molecules consisting of proton donor and acceptor units linked by a single bond, syn-anti rotamerization caused by hydrogen bonding is observed.
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