Temperature, Concentration and Solvent Dependence in Chromic Behaviors of Diflavinylethenes Induced by Aggregation Based Control of π--Conjugated Platform

摘要

Flavins, simple model compounds of various flavoenzymes attract much attention as organocatalysts for molecular transformation1 and functional materials with intense emission properties.2 As part of our program aimed at developing a new strategy for creation of functional luminescent materials based on synthetic alternation on potentially emissive isoalloxazine skeletons,3 we studied the photophysical properties of newly synthesized diflavinylethenes 1 and 2, where two riboflavin moieties are linked to ethylene moiety at C8 position (Figure 1a).