ALTERNATING COPOLYMERS CONSISTING OF ARYLALKYL METHACRYLATES .2. EFFECT OF COIL COLLAPSE ON FLUORESCENCE-SPECTRA OF ALTERNATING COPOLYMERS OF 2-(9-CARBAZOLYL)ETHYL METHACRYLATE AND AROMATIC VINYL MONOMERS

Alternating and random copolymers of 2-(9-carbazolyl)ethyl methacrylat e with aromatic vinyl monomers were synthesized and their fluorescence properties were compared in good and poor solvents. Contraction of th e polymer coils induced the hypochromic effect, i.e., the mutual inter action of the ground-state chromophores, but caused little quenching o f their excited state. This is sharp in contrast with the vinyl-type o f polymers, exhibiting large interactions in both the ground and excit ed states. Introduction of bulky groups on the comonomers in the alter nating copolymers further suppressed these interactions. (C) 1996 John Wiley & Sons, Inc.