- New conjugated poly(pyridinium salt) derivative: AIE characteristics, the interaction with DNA and selective fluorescence enhancement induced by dsDNA
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Herein, a new conjugated poly(pyridinium salt) derivative L was synthesized by ring-transmutation polymerization reaction for the purpose of sensitive and selective fluorescence sensing of DNA. Cationic L exhibits aggregation-induced emission (AIE) characteristics that is weakly emissive in solution but highly luminescent in the aggregate state. Based on its AIE activity, a fluorescence turn-on biosensor for calf thymus DNA (ctDNA) detection is developed, which shows excellent selectivity with a detection limit down to the 10-8 M-1 in CH3CN-phosphate buffer solution (PBS) (2 mM, pH 7.4) (v/v 1: 1). Further, the interactions between L and ctDNA are carefully investigated by UV-vis absorption spectra, dynamic light scattering (DLS) measurements, thermal denaturation studies, circular dichroism (CD) measurements, as well as competing experiments with ethidium bromide (EB). More interestingly, L exhibits selective fluorescence enhancement induced by double-stranded DNA (dsDNA), therefore, L was also successfully utilized as fluorescent probe to follow the ctDNA cleavage process by bovine pancreatic deoxyribonuclease I (DNase I).
- Chang, Ying,Jin, Lu,Duan, Jingjing,Zhang, Qiang,Wang, Jing,Lu, Yan
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p. 103358 - 103364
(2015)
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- Preparation and electrochromic properties of two series of polyurethanes containing separated triphenylamine moiety with different blocks
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Two series of novel aromatic polyurethanes containing triphenylamine derivatives were synthesized via polycondensation of 4-(3,6-diisocyanato-9H-carbazol-9-yl) aniline, N,N-bis(4-isocyanatophenyl) benzene-1,4-diamine with various dihydroxy monomers such as phenolphthalein, 2,2-bis (4-hydroxyphenyl) -propane, 4,4'-dihydroxybiphenyl, 4, 4'-bishydroxy benzophenone and bisphenolfluorene, respectively. The variation of the backbone structure affected the electronic properties, solubility, molecular weight and thermal stability of polyurethanes. The thermal stability of polyurethanes was studied by the gravimetric analyzer. The electrochromic performance was investigated by cyclic voltammograms and spectroelectrochemical methods, which showed stable and reversible electrochromic properties. Besides, the color of polyurethanes can be varied from initial colorless to green then to blue via electro-oxidation, which indicates the polyurethanes will have potential applications for eletrochromic materials. In addition, the PUs exhibited memory characteristic. The result indicated the PUs could be applied in smart window and memory devices.
- Ji, Yan,Zhang, Chunyu,Niu, Haijun,Zhao, Xiaofeng,Wang, Cheng,Qin, Chuanli,Wang, Wen,Bai, Xuduo
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p. 106 - 115
(2015/11/16)
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- Novel aromatic poly(amine-imide)s bearing a pendent triphenylamine group: Synthesis, thermal, photophysical, electrochemical, and electrochromic characteristics
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A new triphenylamine-containing aromatic diamine, N,N-bis(4-aminophenyl)-N′,N′-diphenyl-1,4-phenylenediamine, was synthesized from the animation reaction between 4-aminotriphenylamine and 4-fluoronitrobenzene and subsequent reduction of the dinitro intermediate. A series of novel aromatic poly(amine-imide)s with pendent triphenylamine units were prepared from the newly synthesized diamine and various tetracarboxylic dianhydrides by either a one-step or a conventional two-step polymerization process. All the poly(amine-imide)s were amorphous and readily soluble in many organic solvents such as N-methyl-2-pyrrolidone (NMP), N,N-dimethylacetamide, and chloroform. These polymers could be solution cast into transparent, tough, and flexible films with good mechanical properties. They had useful levels of thermal stability associated with relatively high glass transition temperatures (264-3520°C), 10% weight-loss temperatures in excess of 568°C, and char yields at 800°C in nitrogen higher than 63%. These polymers exhibited strong UV-vis absorption bands at 311-330 nm in NMP solution. The photoluminescence spectra showed maximum bands around 545-562 nm in the green region. The holetransporting and electrochromic properties are examined by electrochemical and spectroelectrochemical methods. Cyclic voltammograms of the poly(amine-imide) films cast onto an indium-tin oxide (ITO)-coated glass substrate exhibited two reversible oxidation redox couples at 0.78 and 1.14 V versus Ag/ AgCl in acetonitrile solution. The poly(amine-imide) films revealed excellent stability of electrochromic characteristics, with a color change from the pale yellowish neutral form to the green and blue oxidized forms at applied potentials ranging from 0.78 to 1.14 V.
- Cheng, Shu-Hua,Hsiao, Sheng-Huei,Su, Tzy-Hsiang,Liou, Guey-Sheng
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p. 307 - 316
(2007/10/03)
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- Synthesis, luminescence and electrochromism of aromatic poly(amine-amide)s with pendent triphenylamine moietiest
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A new triphenylamine-containing aromatic dicarboxylic acid monomer, N,N-bis(4-carboxyphenyl)-N′,N′-diphenyl-1,4-phenylenediamine (2), was synthesized from the amination reaction between 4-aminotriphenylamine and 4-fluorobenzonitrile and subsequent alkaline hydrolysis of the dinitrile intermediate. A series of novel aromatic poly(amine-amide)s with triphenylamine units in the main chain and as the pendent group were prepared from the newly synthesized dicarboxylic acid and various aromatic diamines. These poly(amine-amide)s were amorphous and readily soluble in many organic solvents. All the polymers could be solution-cast into flexible films with good mechanical properties. They had excellent levels of thermal stability associated with high glass-transition temperatures (226-261°C). These polymers exhibited strong UV-vis absorption bands at 350-365 nm in NMP solution. Their photoluminescence spectra showed maximum bands around 512-543 nm in the green region. The hole-transporting and electrochromic properties are examined by electrochemical and spectroelectrochemical methods. Cyclic voltammograms of the poly(amine-amide) 5a prepared from the dicarboxylic acid monomer 2 with a structurally similar diamine monomer N,N-bis(4-aminophenyl)-N′,N′- diphenyl-1,4-phenylenediamine (4a) exhibited four reversible oxidation redox couples in acetonitrile solution at E1/2 = 0.60, 0.80, 0.97 and 1.13V, respectively. All the poly(amine-amide)s exhibited excellent reversibility of electrochromic characteristics by continuous five cyclic scans between 0.0 to 1.30 V, with a color change from the original pale yellowish neutral form to the green and then to blue oxidized forms. The Royal Society of Chemistry 2005.
- Liou, Guey-Sheng,Hsiao, Sheng-Huei,Su, Tzy-Hsiang
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p. 1812 - 1820
(2008/09/21)
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