66710-74-5Relevant academic research and scientific papers
A Bis-Quinoline Appended Azobenzene Based Naked Eye Sensor for Selective Detection of Cd2+ Ion
Hrishikesan, Elango,Manjunath, Rangasamy,Kannan, Palaninathan
, p. 907 - 919 (2016/07/06)
A new azobenzene chromophore (AZQU), appended with a bis-quinoline unit as a turn-on chemosensor for selective detection of Cd2+ ions, has been designed and synthesized. The fluorescent receptor AZQU has an excellent selectivity and sensitivity towards Cd2+ ions over other metal ions in CH3CN:H2O (80:20, v/v) solution. AZQU is red colored and non-fluorescent in the absence of Cd2+ ions, but upon addition of Cd2+ ions it turns colorless with appreciable fluorescence. This “off–on” type signaling behavior is attributed to the CHEF (chelation-enhanced fluorescence) effect of the quinoline unit and the change in color from red to yellow occurs by an ICT process with Cd2+. The association constant for AZQU?+?Cd2+ was calculated to be 1.68?×?105 L·mol?1 with binding in the 1:1 stoichiometric ratio.
Click chemistry-based synthesis of azo polymers for second-order nonlinear optics
Kolli, Balakrishna,Mishra, Sarada P.,Joshi,Raj Mohan,Dhami,Samui
experimental part, p. 1572 - 1578 (2012/06/01)
Four linear polymers containing pendant azo moiety were synthesized through click chemistry for second-order nonlinear optical study. The polymers were found soluble in most of the polar organic solvents such as tetrahydrofuran (THF), chloroform, and dimethyl formamide (DMF). The polymers showed thermal stability up to 300 °C and glass transition temperatures (Tg) in the range of 120-140 °C. The molecular weights (Mw) of these polymers (measured by gel permeation chromatography) were in the range 37,900-55,000 g/mol. The polymers were found to form optically transparent films by solution casting from THF solution. Order parameters were calculated from UV-vis absorption spectra. The morphology changes in the films after poling were characterized by atomic force microscopy. The angular dependence, temperature dependence, and time dependence of second harmonic generation (SHG) intensity were obtained by using 1064 nm Nd:YAG laser. The SHG intensity remained unchanged up to 95 °C. At room temperature, it remained stable up to 8 days after initial drop of about 14%.
