Cost-effective approach to detect Cu(ii) and Hg(ii) by integrating a smartphone with the colorimetric response from a NBD-benzimidazole based dyad

2019 ◽  
Vol 21 (22) ◽  
pp. 11839-11845 ◽  
Author(s):  
Thangaraj Anand ◽  
Suban K. Sahoo
Keyword(s):  
Charge Transfer ◽  
High Selectivity ◽  
Colour Change ◽  
Cost Effective ◽  
Pale Yellow ◽  
Colorimetric Response ◽  
Cost Effective Approach ◽  
Distinct Colour ◽  
Internal Charge Transfer ◽  
Internal Charge

A new optical chemosensor N1 was designed and synthesized by condensing 4-chloro-7-nitrobenzofurazan with 2-aminophenylbenzimidazole. In CH3OH : H2O (1 : 1, v/v) medium, sensor N1 exhibited high selectivity and sensitivity towards Cu2+ and Hg2+ ions by showing a distinct colour change from pale yellow to pink due to the internal charge transfer occurring between the sensor N1 and the Cu2+/Hg2+ ions upon complexation in 1 : 1 stoichiometry.

scholarly journals pH-Responsive chromogenic-sensing molecule based on bis(indolyl)methene for the highly selective recognition of aspartate and glutamate

2011 ◽  
Vol 7 ◽  
pp. 218-221 ◽  
Author(s):  
Litao Wang ◽  
Xiaoming He ◽  
Yong Guo ◽  
Jian Xu ◽  
Shijun Shao
Keyword(s):  
Charge Transfer ◽  
Proton Transfer ◽  
High Selectivity ◽  
Detection Limits ◽  
Selective Recognition ◽  
Ph Responsive ◽  
Internal Charge Transfer ◽  
Acceptor Moiety ◽  
Transfer State ◽  
Internal Charge

Bis(indolyl)methene displays high selectivity and sensitivity for aspartate and glutamate in water-containing medium based on the proton transfer signaling mode. The presence of acid can easily induce proton transfer to the basic H-bond acceptor moiety, which modulates the internal charge transfer state of the bis(indolyl)methene skeleton and gives rise to dramatic change in color. The detection limits for aspartate and glutamate were 0.80 ppm and 1.12 ppm, respectively.

A benzothiazole-based fluorescence turn-on sensor for copper(II)

2021 ◽  
Author(s):  
Gyeongjin Kim ◽  
Donghwan Choi ◽  
Cheal Kim
Keyword(s):  
Charge Transfer ◽  
Limit Of Detection ◽  
Theoretical Calculations ◽  
Enhanced Fluorescence ◽  
Turn On ◽  
Fluorescent Response ◽  
Chelation Enhanced Fluorescence ◽  
Fluorescence Turn On ◽  
Internal Charge Transfer ◽  
Internal Charge

Abstract A new benzothiazole-based chemosensor BTN (1-((Z)-(((E)-3-methylbenzo[d]thiazol-2(3H)-ylidene)hydrazono)methyl)naphthalen-2-ol) was synthesized for the detection of Cu2+. BTN could detect Cu2+ with “off-on” fluorescent response from colorless to yellow irrespective of presence of other cations. Limit of detection for Cu2+ was determined to be 3.3 µM. Binding ratio of BTN and Cu2+ turned out to be a 1:1 with the analysis of Job plot and ESI-MS. Sensing feature of Cu2+ by BTN was explained with theoretical calculations, which might be owing to internal charge transfer and chelation-enhanced fluorescence processes.

A molecular tailoring approach – a new guide to quantify the energy of push–pull effects: a case study on (E)-3-(1H-pyrrol-2-yl)prop-2-enones

2020 ◽  
Vol 22 (39) ◽  
pp. 22190-22194
Author(s):  
Andrei V. Afonin ◽  
Danuta Rusinska-Roszak
Keyword(s):  
Charge Transfer ◽  
New Approach ◽  
Internal Charge Transfer ◽  
Internal Charge ◽  
Molecular Tailoring

We report a new approach to quantify the push–pull effect in molecules with internal charge transfer.

Structural modulation of internal charge transfer in small molecular donors for organic solar cells

2012 ◽  
Vol 48 (71) ◽  
pp. 8907 ◽  
Author(s):  
Antoine Leliège ◽  
Charles-Henri Le Régent ◽  
Magali Allain ◽  
Philippe Blanchard ◽  
Jean Roncali
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Structural Modulation ◽  
Internal Charge Transfer ◽  
Internal Charge
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