pH-Regulated “Off–On” fluorescence signalling of d-block metal ions in aqueous media and realization of molecular IMP logic function

Sarkar, Moloy; Banthia, Sandip; Patil, Aditi; Ansari, Mohd Bismillah; Samanta, Anunay

doi:10.1039/b607642d

Cited by 24 publications

(16 citation statements)

References 29 publications

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“…3d, Table 1). It deviates from the behavior reported for some nitro-aromatics that exhibit polarity-induced enhancement of their fluorescence [21][22][23][61][62][63][64][65][66][67] . An increase in solvent polarity drastically reduces the fluorescence quantum yields of 1p, 2p, 1m and 2m ( Table 1).…”

Section: Resultscontrasting

confidence: 99%

Deciphering the unusual fluorescence in weakly coupled bis-nitro-pyrrolo[3,2-b]pyrroles

et al. 2020

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Electron-deficient π-conjugated functional dyes lie at the heart of organic optoelectronics. Adding nitro groups to aromatic compounds usually quenches their fluorescence via inter-system crossing (ISC) or internal conversion (IC). While strong electronic coupling of the nitro groups with the dyes ensures the benefits from these electron-withdrawing substituents, it also leads to fluorescence quenching. Here, we demonstrate how such electronic coupling affects the photophysics of acceptor–donor–acceptor fluorescent dyes, with nitrophenyl acceptors and a pyrrolo[3,2-b]pyrrole donor. The position of the nitro groups and the donor-acceptor distance strongly affect the fluorescence properties of the bis-nitrotetraphenylpyrrolopyrroles. Concurrently, increasing solvent polarity quenches the emission that recovers upon solidifying the media. Intramolecular charge transfer (CT) and molecular dynamics, therefore, govern the fluorescence of these nitro-aromatics. While balanced donor-acceptor coupling ensures fast radiative deactivation and slow ISC essential for large fluorescence quantum yields, vibronic borrowing accounts for medium dependent IC via back CT. These mechanistic paradigms set important design principles for molecular photonics and electronics.

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Section: Resultscontrasting

confidence: 99%

Deciphering the unusual fluorescence in weakly coupled bis-nitro-pyrrolo[3,2-b]pyrroles

et al. 2020

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“…The approach to modulate the strength of NBD fluorescence employs photoinduced electron transfer (PET), 98,99 where the energy level of the HOMO orbitals of n-donors governs the fluorescence quenching in 39a–i (Scheme 2 and Table 12). 100 The fluorescence efficiency depends on both the electron-donor strength and the medium polarity.…”

Section: Suppressing Intersystem Crossing In Non-polar Solventsmentioning

confidence: 99%

Revisiting the non-fluorescence of nitroaromatics: presumption versus reality

et al. 2022

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“…On the other hand, fluorescent molecular logic gates (making fluorescent signal as output and external factors, such as biomolecules, pH, anions and cations, as input [43][44][45][46]) have attracted the attention of chemists since the first fluorescent molecular logic gate has been reported by de Silva [47] et al In these systems, the output, ''on" or ''off'' switching of fluorescence signal, was represented by ''1'' or ''0'' and it is in response to the addition ' '1'' or no addition ''0'' of the input chemicals.…”

Section: Graphical Abstractmentioning

confidence: 99%

An oxalamidoquinoline-based fluorescent sensor for selective detection of Zn2+ in solution and living cells and its logic gate behavior

Tian

Guo

et al. 2016

Sensors and Actuators B: Chemical

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pH-Regulated “Off–On” fluorescence signalling of d-block metal ions in aqueous media and realization of molecular IMP logic function

Cited by 24 publications

References 29 publications

Deciphering the unusual fluorescence in weakly coupled bis-nitro-pyrrolo[3,2-b]pyrroles

Deciphering the unusual fluorescence in weakly coupled bis-nitro-pyrrolo[3,2-b]pyrroles

Revisiting the non-fluorescence of nitroaromatics: presumption versus reality

An oxalamidoquinoline-based fluorescent sensor for selective detection of Zn2+ in solution and living cells and its logic gate behavior

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