Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Polymer Chemistry called Enhanced fluorescence quantum yield of syndiotactic side-chain TPE polymers via Rh-catalyzed carbene polymerization: influence of the substitution density and spacer length, Author is Li, Xiao; Sun, Yuhao; Chen, Jian; Wu, Zhongying; Cheng, Pin; Li, Qian; Fang, Jianglin; Chen, Dongzhong, which mentions a compound: 50816-19-8, SMILESS is OCCCCCCCCBr, Molecular C8H17BrO, Reference of 8-Bromooctan-1-ol.
A series of syndiotactic C1 polymers PmTPE with tetraphenylethene (TPE) side groups attached through various length alkyl spacers of carbon numbers m = 2-6, 8, 10, and 12 have been prepared via Rh-catalyzed carbene polymerization, with the homologues with very short spacers encountering quite arduous challenges. All the polymers investigated possess typical aggregation-induced emission (AIE) properties whether in solution aggregates or in solid films and reveal a remarkable increase in fluorescence quantum yields with shortened alkyl spacer lengths, coinciding with the increased glass transition temperatures and in agreement with the same tendency to increase manifested by the TPE-based side-chain C2 polyacrylate polymers. Moreover, they display high fluorescence quantum yields with about 20% increase compared to their usual C2 polymer counterparts with the same side-chain spacer lengths. Their high quantum yields are unaffected by adequate thermal annealing, and they are thermodynamically stable as confirmed by the X-ray scattering anal., indicating an unaltered highly constrained structure, thus significantly promoting the restriction of intramol. rotations (RIR) of TPE luminogens and blocking the non-radiative channels. A testing paper strip coated with representative P4TPE is exemplified as an economical, reusable, and visualized method for TNT explosive detection with high sensitivity. The significant fluorescence emission enhancement of C1 polymers because of the high substitution d. and syndiotactic regularity may provide an inspiring route for the preparation of further upgraded AIE polymer materials for various applications.
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