844658-08-8Relevant articles and documents
New conjugated poly(pyridinium salt) derivative: AIE characteristics, the interaction with DNA and selective fluorescence enhancement induced by dsDNA
Chang, Ying,Jin, Lu,Duan, Jingjing,Zhang, Qiang,Wang, Jing,Lu, Yan
, p. 103358 - 103364 (2015)
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).
Novel aromatic poly(amine-imide)s bearing a pendent triphenylamine group: Synthesis, thermal, photophysical, electrochemical, and electrochromic characteristics
Cheng, Shu-Hua,Hsiao, Sheng-Huei,Su, Tzy-Hsiang,Liou, Guey-Sheng
, p. 307 - 316 (2007/10/03)
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.
