Lifetimes of the excited state of oxazole and oxadi-azole derivatives in mixed water-ethanol and water-acetone solvent systems
Abstract
The lifetimes of the excited state of seven luminophores, 2,5-diphenyl-1,3-oxazole (PPO), 2-(4-diphenyl)-5-phenyl-1,3,4-oxadiazole (BPD), 2,5-di-(β-naphtyl)-1,3,4-oxadiazole (NND), 2-(4-diphenyl)-5-phenyl-1,3-oxazole (BPO), 2-α-naphtyl-5-phenyl-1,3-oxazole (NPO), 1,4-bis(5-phenyl-oxazolyl 2)benzene (р-РОРОР), and 1,2 bis(5-phenyl-oxazolyl-2)benzene (o-РОРОР), have been determined in mixed water-ethanol and water-acetone solvents at 298.15 K. It has been found that for the majority of investigated luminophores lifetimes of the excited state change insignificantly with the transition from organic solvents to water. The multipleparameter correlation analysis of lifetimes of the excited state of luminophores dependence on solvent polarity parameters has been carried out. It has been found that the correlation between the life-time of the excited state of luminophores and parameters of solvent polarity exists only for o-POPOP and p-POPOP, BPO; these parameters are normalized Reichardt parameter and Hildebrand solubility parameter.
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