“…Wang et al reported a boron complex of tetraphenylethylene incorporated β-diketonate, 29 (Chart 3), and successfully developed four different crystalline forms ( 29Y , 29R , 29N and 29F ) of it by using the dichloromethane and hexane mixed solvent system. 114 Fig. 16(a, c, e and g) shows the fluorescence spectra of 29Y , 29R , 29N and 29F under different stimuli in which the prominent emission peaks for the crystalline forms of 29Y , 29R , 29N and 29F were observed at 547 nm, 580 nm, 617 nm, and 602 nm, respectively.…”