Dual-State Emission of 2-(Butylamino)Cinchomeronic Dinitrile Derivatives

Abstract

New representatives of 2-(butylamino)cinchomeronic dinitrile derivatives were synthesized as promising fluorophores showing dual-state emission. To characterize the influence of the length (from methyl to butyl) and the structure (both linear and branched) of the alkyl substituent at the amino nitrogen atom, the spectral fluorescence properties of all synthesized compounds were carefully studied both in solution and in solid state. The highest photoluminescence quantum yield values of 63% were noted for solutions of 2-(butylamino)-6-phenylpyridine-3,4-dicarbonitrile in DCM and 2-(butylamino)-5-methyl-6-phenylpyridine-3,4-dicarbonitrile in toluene.

Simple and Efficient Synthesis of Highly Functional 2-Oxonicotino­nitriles from 2-Chloronicotinonitriles

“…For secondary amines, a side reaction of halogen substitution for the corresponding amine was observed. 45 46 Among the butoxides, potassium tert -butoxide was found to give the best results. It was found that the optimal temperature for the best yield is 25–35 °C.…”

Tunable full-color emission of stilbazoles containing a 2-halo-3,4-dicyanopyridine acceptor

“…The mobile halogen atom and two reactive cyano groups will allow a facile modification of the acceptor unit of chromophores by the introduction of the desired moieties. [51][52][53][54][55][56][57][58][59]…”