Microwave Synthesis of Near Infrared Heptamethine Cyanine Dye

Microwave Synthesis of Quaternary Ammonium Salts

“…The reactions were performed by charging each microwave reaction vial with of 2,3,3-trimethylindolenine and an alkyl halide ( Scheme 2 ). Our previously published reaction of ethyl iodide with 2,3,3-trimethylindolenine served as the model system [ 14 ]. The microwave reaction conditions were determined using a single-mode microwave system.…”

Carbazole based hemicyanine dye for both “naked eye” and ‘NIR’ fluorescence detection of CN− in aqueous solution: from molecules to low cost devices (TLC plate sticks)

“…When 1,3,3-trimethyl-2-methyleneindoline was treated with EtI in acetonitrile as a solvent, the corresponding salt (C) was obtained. 16 Receptor CHD was obtained by Knoevenagel condensation. 17 The structure of the receptor was confirmed using 1 H NMR, 13 Essentially, these changes in the absorption spectrum stopped and the ratio of the absorbance intensities at 285 and 493 nm (A 285 /A 493 ) became constant when the amount of CN − added reached 2 equiv.…”