FLUORESCENCE BEHAVIOR OF METHACRYLATES HAVING CARBAZOLE MOIETY AND ITS POLYMERS

对于含有给电子荧光生色团的丙烯酸类单体或含有受电子荧光生色团的乙烯氧基类单体的荧光行为的研究发现,这类单体都表现出一个共同的特点,即在相同生色团浓度下单体的荧光强度皆明显低于其相应的聚合物.我们将这种现象称为荧光"结构自猝灭效应"(SSQE).Three carbazole-containing methacrylates, i.e. 2-(N-carbazolyl)ethyl methacrylate (CzEMA), 6-(N-carbazolyl) hexyl methacrylate( CzHMA) and 11-(N-carbazolyl) undecyl methacrylate( CzUMA), and their model compounds 2-(N-carbazolyl)ethyl isobutyrate, 6-(N-carbazolyl)hexyl isobutyrate and 11-(N-carbazolyl) undecyl isobutyrate were synthesized. These monomers can be easily homo- and copolymerized with MMA. by the initiation of AIBN. UV absorption spectra show that there is no or negligible interaction between methacrylate and the carbazolyl chromophore in the ground state. Fluorescence spectra of these monomers, their model compounds and copolymers show that CzEMA exhibits fluorescence structural self-quenching effect (SSQE), but CzHMA and CzUMA does not. This result indicates that SSQE expressed by CzEMA is caused by intramolecular charge transfer interaction between the excited carbazolyl chromophore and the electron-accepting carbon-carbon double bond of acrylic group.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000080623100021&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701SCI(E)中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)32236-23