Fluorescence quenching of 2-piperidinoanthraquinone
Abstract
Fluorescence solvent shift data indicate the first excited singlet state of 2-piperidinoanthraquinone [2-PA] to be considerably more polar than its ground state. Amines quench the fluorescence of [2-PA] in cyclohexane by electron transfer. Alcohols also quench the fluorescence but by a different mechanism involving hydrogen bonding between the alcohol and the ground state of [2-PA] to form a complex that is itself fluorescent.