Subtle structural variation in azine/imine derivatives controls Zn²⁺sensitivity: ESIPT-CHEF combination for nano-molar detection of Zn²⁺with DFT support

Abstract

Single crystal X-ray structurally characterised ESIPT-active weakly fluorescent imine and azine derivatives undergo Zn2+ assisted turn ON fluorescence.

Aggregation-induced emission-active azines for chemosensing applications: a five-year update

“…109 PEG segments and DTT units formed stable micelles to help the polymer disseminate in water and preferentially complex with Cu 2+ , making it a fluorescent sensor in aqueous media. Wang et al reported a linear AIE supramolecular polymer (57) from a salicylaldehyde azine-containing pillar [5]arene dimer (55) and an azine-based homoditopic guest (56) and utilized it as a turn-off Cu 2+ sensor [Fig. 14].…”

“…54 Khanra et al further reported a β-naphthol derived azinebased chemosensor (20) for the detection of Zn 2+ ions at the nano-molar level [Table 1, entry 13]. 55 The chelation of Zn 2+ ions with 20 results in chelation-enhanced fluorescence (CHEF) through inhibition of ESIPT and -CNisomerization and an enhanced emission was observed at 495 nm. The probe displayed negligible CHEF in the presence of other metal ions and showed a detection limit as low as 36.16 nM.…”

An Unsymmetrical bis‐Imine Derivative for Solvent Dependent Rapid Optical Discrimination of Al3+, Zn2+ and OCl−: Combined Experimental and Theoretical Studies

“…In addition, the role of solvent towards the selectivity and sensitivity of detection is noteworthy [4–5] . The function of a sensor may involve several types of interactions between host and guest like hydrogen bonding, probe‐cation coordination, aggregation, electrostatic interaction, hydrophobic and van der Waal's interactions etc [6–8] . A single probe having significantly different response towards multiple ions is cost effective, time saving and hence, highly desirable for practical application [9–10] .…”

“…[4][5] The function of a sensor may involve several types of interactions between host and guest like hydrogen bonding, probe-cation coordination, aggregation, electrostatic interaction, hydrophobic and van der Waal's interactions etc. [6][7][8] A single probe having significantly different response towards multiple ions is cost effective, time saving and hence, highly desirable for practical application. [9][10] As solvent may alter the nature and energy parameters of the receptor, hence can alter the fluorescence response and selectivity, generally termed as solvatochromic effect.…”

Exploring a new dinuclear Fe(iii) complex for the fixation of atmospheric CO2 and optical recognition of nano-molar levels of Zn2+ ions

“…11 On the other hand, abnormal zinc metabolism leads to several health issues, including delayed sexual maturation, prostate cancer, type 2 diabetes mellitus (T2DM), Wilson's disease, amyotrophic lateral sclerosis (ALS), and agerelated macular degeneration (AMD). [12][13][14] It is believed that Zn 2+ homeostasis has some correspondence with the pathology of Alzheimer's disease 15 and other brutal neurological problems, such as cerebral ischemia 4 and epilepsy. 5 Currently, the catalytic activities of metal complexes have acquired signicant attention.…”