High performance poly(N‐aryleneindole ether) containing pyridine units as a novel acid response fluorescent detector

Abstract

A novel high-performance polyindole containing a pyridine ring (P1) was successfully prepared by the catalyst-free nucleophilic substitution polycondensation of 4-hydroxyindole with 2,6-difluoropyridine via a C − N and C − O coupling reaction process. This semirigid polyindole P1 exhibits good thermal stability, and it can be dissolved well in common organic solvents. Fluorescent spectral studies indicate that the resulting polymer shows blue-light emission at 402 nm due to the effect of intramolecular charge transfer caused by the donor − acceptor interaction between its indole and pyridine units. Moreover, the fluorescence intensity of P1 could be altered by protonation and deprotonation. Such behaviour enables it to be utilized as one kind of acid response fluorescent polymer sensor.

Palladium-catalyzed synthesis of 2,3-disubstituted indoles via arylation of ortho-alkynylanilines with arylsiloxanes

“…The target compound was prepared following the general procedure in 7,137.2,131.7,131.3,131.2 (d,J = 6.0 Hz),131.1,128.5,128.1,126.9,122.3,120.3,119.3,115 The target compound was prepared following the general procedure in Table 2 137.3, 133.8, 131.6, 131.2, 131.1, 131.0, 128.5, 128.4, 128.3, 126.7, 122.4, 120.4, 119.3, 113.9, 109.7, 31.0.…”

“…3 Indole moieties are commonly found in bioactive substances, 4 electronic materials, 5 optically responsive materials, 6 and fluorescent polymer sensors. 7 As a result of their outstanding bio-significant and commercial applications, substituted indoles have received considerable attention from the scientific community. In the biological significance of indole molecules, the antiviral properties of arbidol 8 a and lescol have been recognized for HMG-CoA-reductase inhibition properties.…”

N,N-Dimethylformamide-stabilized palladium nanoclusters as a catalyst for Larock indole synthesis

“…1 Indole moieties are common in bioactive substances, 2 optically responsive materials, 3 electronic materials, 4 and uorescent polymer sensors. 5 Many methods for the synthesis of indole derivatives have been developed. [6][7][8][9][10][11][12][13][14][15][16] Fischer and co-workers reported that the reactions of aryl hydrazines with ketones gave 2,3-disubstituted indoles.…”

An Optical pH Sensor Based on Diazocine

“…The diazocine group serves as a cyclooctatetraene analogy which has a nonplanar 8‐membered ring structure with nitrogen atoms as shown in the Figure A. According to the literature precedent, diazocine which has lone pair electrons is easily bind with protons to form diazocinium ,. In addition, the diazocinium unit is a strong electron‐accepting group and exhibits a stronger intra molecular charge transfer (ICT) effect.…”