Protonation induced redshift in the fluorescence of a pyridine derivative as a potential anti-counterfeiting agent

Abstract

A simple pyridine-based compound i.e. (2,4,6-tris(4-(hexyloxy)phenyl)pyridine) was synthesized and exhibited an excellent solubility under various organic solvents owing to the presence of three 4-n-hexyloxy chains in its molecular structure. Further,...

Reaction acceleration at the surface of a levitated droplet by vapor dosing from a partner droplet

“…66 Interestingly, intermittently a green light was observed, for example, at t = 55 s. This red-shied emission might be attributed to water adsorption altering the solvent environment, 67 but more probably it is due to aggregation-induced enhanced emission (AIEE) resulting from the rotor structure of 2e, which features three phenyl rings. 68 The formation of the pyridinium photocatalyst was further conrmed by mass spectrometry, revealing a peak at m/z 420 (Fig. 4c).…”

Cholesterol-appended cyanostyryl thiophene positional isomers with multistimuli responsive emission switching and liquid crystalline properties

“…Solid state luminescent systems based on organic molecules find applications in different fields such as flat panel displays, [1][2][3] switches, 4,5 sensors, [6][7][8][9] organic light emitting diodes (OLEDs) 10,11 and anti-counterfeit materials. [12][13][14][15][16] Highly emissive solid state materials can be achieved by suitably modifying p-conjugated chromophores such as cyanostilbenes, 17,18 phenylenevinylenes, 19,20 phenylene-ethynylene, 21,22 phenylenes, 23,24 etc. Although there is a possibility for aggregation caused quenching in these molecules due to p-p stacking, certain systems have shown enhanced emission in the solid state in comparison to their dilute solutions.…”

“…45 Cyanostyrylbenzenes are an important class of compounds with aggregation induced emission and multistimuli response. 16,18 Stimuli responsive cyanostyryl systems were studied by various research groups and established the role of diverse packing modes in the solid state emission. 46,47 In one of the explorations, Park and coworkers demonstrated the mechanochromic emission switching in alkyloxy substituted symmetrical dicyanodistyrylbenzene and established the crucial role of molecular arrangement in the observed stimuli response.…”