5-(2,6-Bis((E)-4-(dimethylamino)styryl)-1-ethylpyridin-4(1H)-ylidene)-2,2-dimethyl-1,3-dioxane-4,6-dione: aggregation-induced emission, polymorphism, mechanochromism, and thermochromism

Abstract

A new 1,4-dihydropyridine derivative was reported to display intriguing multifunctional photophysical properties.

Mechanochromic luminogens with hypsochromically shifted emission switching property: recent advances and perspectives

“…Zhou et al synthesized a mechanoresponsive luminogen, 69 , based on 1,4-dihydropyridine substituted with 2,2-dimethyl-1,3-dioxane-4,6-dione at the 4-position and N , N -dimethyl aniline units at 2- and 6-positions (Chart 8). 135 69 displayed polymorphism and three polymorphs were developed, 69-Y , 69-O and 69-R, in n -hexane/acetone, toluene/chloroform, and ethyl acetate/chloroform, respectively. The crystalline forms of 69-Y , 69-O and 69-R showed emission maxima at 577 nm, 598 nm, and 633 nm, respectively.…”

Metal‐Free Facile Synthesis of Multisubstituted 1‐Aminoisoquinoline Derivatives with Dual‐State Emissions

“…However, these approaches were difficult to construct multisubstituted 1‐aminoisoquinolines . Recently, our group has been devoted to the construction of 4 H ‐pyran/1,4‐dihydropyridine‐based solid‐state fluorescence stimulus‐responsive materials using 2,6‐dimethyl‐4‐pyrone ( 1 ) as the starting material (Scheme ) . More recently, we were surprised to find that the reaction of 2‐(2,6‐dimethyl‐4 H ‐pyran‐4‐ylidene)‐3‐oxopentanedinitrile ( 2 ) with piperidine afforded to an unexpected multisubstituted 1‐aminoisoquinoline derivative, namely 8‐hydroxy‐3,6‐dimethyl‐1‐(piperidin‐1‐yl)isoquinoline‐7‐carbonitrile ( 3 a ) .…”

Crystallization-Induced Red Phosphorescence and Grinding-Induced Blue-Shifted Emission of a Benzobis(1,2,5-thiadiazole)–Thiophene Conjugate

“…Mechanochromic luminogens, whose emission can be finely modulated upon mechanical stimulation through the changing of molecular arrangement, have attracted intense interest on account of their fundamental importance and promising technical applications in memory devices, strain sensors, security inks, and camouflage. − Currently, most reported organic mechanochromic luminogens exhibit red-shifted emissions in response to mechanical stimuli; − those with blue-shifted emissions are rarely reported, − despite their importance for the comprehensive understanding of mechanisms and for summarizing the universal design principle. On the one hand, most reported conventional emitters normally demonstrate aggregation-caused quenching (ACQ) in the aggregation state, making it difficult to receive intense solid emission and consequently hard to observe mechanochromism.…”