Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 47, Issue 20, Pages 5416-5425Publisher
WILEY-BLACKWELL
DOI: 10.1002/pola.23591
Keywords
biopolymers; carbazole; energy transfer; fluorescence; functionalization of polymers; luminescence; natural DNA; photoluminescence; photophysics; pyrene
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Funding
- NBIT [K2070200068808A040001710]
- Ministry of Education, Science & Technology (MoST), Republic of Korea [2007-00188] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [과09A1514] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Organic soluble DNA bearing two different fluorophores in the side chain was prepared by reacting purified DNA with the cationic molecules 9-(12-bromododecyl)-9H-carbazole and (E)-1-(4-(12-bromododecyloxy)styryl)pyrene in water. Two homopolymers (CzDNA and PyDNA) and random copolymers (CzDNA-co-PyDNA) were prepared successfully. The absorption and photoluminescence (PL) behavior of CzDNA-co-PyDNA with pyrene derivative concentrations was investigated. As reference, we employed a guest-host system and polymer blends using DNA homopolymers. The Forster energy transfer process was investigated in three different DNA systems. The DNA copolymer system showed much better energy transfer efficiency than the other DNA systems. The copolymers were mixed with 2-{2-[2-(4-diethylamino-phenyl)-vinyl]-6-methyl-pyran-4-ylidene}-malononitrile (DCM) at an optimum concentration. At low DCM concentration (0.3 wt %), undesired emissions were observed due to an incomplete energy transfer process from excited pyrene moieties. At high DCM concentration (5.0 wt %), red emissions were predominant; this is attributed to an efficient Forster energy transfer process. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5416-5425, 2009
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