Synthesis, crystal structures and photoluminescence of anthracen- and pyrene-based coumarin derivatives.

Abstract Two new anthracen- and pyrene-based coumarin derivatives, 3-(4-(anthracen-10-yl)phenyl)coumarin ( 4 ) and 3-(4-(pyrene-1-yl)phenyl)coumarin ( 5 ), were synthesized and characterized by FT-IR, 1 H NMR, element analysis and single crystal X-ray crystallography. The UV–vis absorption and photoluminescence spectra of these coumarin derivatives were investigated. The results show that compound 4 and 5 exhibit blue and blue-green emissions, respectively, under ultraviolet light excitation. Compared with the compound 4 , the emission peak of compound 5 was bathochromically shifted by about 80 nm due to the more planar structure and larger π-conjugation.