A viscochromic, mechanochromic, and unsymmetrical azine for selective detection of Al³⁺ and Cu²⁺ ions and its mitotracking studies

Abstract

A mechanoresponsive, viscochromic, and unsymmetrical azine NDEA probes Al3+ and Cu2+ ions and also co-localizes in the mitochondria of C6 glioma cell lines.

Cholesterol‐Coupled Diazine‐Phenol Gelator: Cyanide Sensing, Phase‐Selective Gelation in Oil Spill Recovery and Dye Adsorption

“…Hydrophobic interaction between the cholesterol motifs and extensive π‐π stacking between the naphthalene units are the possible driving forces for gelation of 1 in different solvents. Intramolecular hydrogen bonding between the imine nitrogen and the −OH group locks the molecular conformation in a planar arrangement (Figure S1) and results in extensive π‐π stacking between the naphthalene rings for which aggregation occurs . To understand aggregation in toluene, UV–vis and fluorescence spectra of 1 was compared in sol and gel states (Figure ).…”

“…Therefore, in the presence of CN − ions, H‐ bonding followed by deprotonation of the naphthol −OH caused the destruction of the gel. Furthermore, in the deprotonated state, intramolecular charge transfer resulted in the red coloration of the solution.…”

“…), the intensity of these two absorption bands was successively decreased. In addition, a very weak absorption at 460 nm, characteristics of intramolecular charge transfer after the deprotonation of the naphthol hydroxyl group, appeared (Figure a). In such a ratiometric response, a clear isosbestic point at 427 nm was observed which implied the formation of a single UV‐vis active species within the titration medium.…”

“…The intramolecular charge transfer, coloration, and ESIPT, etc. in the present example are in accordance with the observations in some unsymmetrical diazine derivatives derived from 2‐hydroxynaphthaldehyde . Further 1 H NMR study of 1 with CN − ions evidently supported our assumption.…”

Thiophene-containing tetraphenylethene derivatives with different aggregation-induced emission (AIE) and mechanofluorochromic characteristics

“…[9][10][11][12][13][14][15][16][17][18] Bright solid-state emission and high contrast before and aer grinding are very signicant for the high efficient application of mechanochromic uorescence materials. [19][20][21][22][23][24][25][26][27][28] However, a majority of traditional emissive materials usually exhibit poor emission efficiency in the solid state due to the notorious phenomenon of aggregation caused quenching (ACQ), and the best way to solve the problem is to develop a class of novel luminescent materials oppositing to the luminophoric materials with ACQ effect. Fortunately, an unusual aggregation-induced emission (AIE) phenomenon was discovered by Tang et al in 2001.…”