Polymorphism and Reversible Mechanochromic Luminescence for Solid-State Difluoroboron Avobenzone

摘要

The solid-state fluorescence of organic molecules strongly depends on the molecular structure and intermolecular interactions present in different morphologies. Various emission colors may be achieved from the same fluorophore by taking advantage of material polymorphism, which is controllable by processing methods.5 Another more unusual strategy involves force-induced emission color changes, or mechanochromic luminescence. For some mechanoresponsive gold complexes, the photoluminescence can be switched by grinding. For example, ordered aggregates and an amorphous solid are responsible for the blue and yellow emission colors, respectively, of [(C_6F_5Au)_2(μ-1,4diisocyanobenzene)].