The quenching of m-methoxycinnamic acid fluorescence

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Abstract

Small quantities of diethyl ether quench the fluorescence of trans-m-methoxycinnamic acid dissolved in hexane. Measurements of the rates of trans to cis photoisomerization and the steady state concentrations of trans and cis isomers produced by photolysis of the solution indicate that the non-radiative relaxation promoted by ether occurs principally via a twisted form of the excited state. In the presence of ether, twisting about the ethylenic double bond of m-methoxycinnamic acid appears to be facilitated by disruption of intermolecular hydrogen bonding which exists between the carboxylic groups of pairs of cinnamic acid molecules.

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