Abstract
Apparently innocuous solvents such as methylene chloride and chloroform efficiently quench the fluorescence of azoalkane 1 with rate constants of up to 10 8 M −1 s −1 and deuterium effects of ≈ 3.2. This novel fluorescence quenching mechanism by CH bonds is attributed to radiationless deactivation promoted by covalent hydrogen bonding interactions.
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