Single Electron Transfer-Driven Multi-Dimensional Signal Read-out Function of TCNQ as an “Off-the-Shelf” Detector for Cyanide

Ajayakumar, M. R.; Mandal, Kalyanashis; Rawat, Kamla; Asthana, Deepak; Pandey, Ravindra; Sharma, Akanksha; Yadav, Sarita; Ghosh, Subhasis; Mukhopadhyay, Pritam

doi:10.1021/am4011176

Cited by 42 publications

(28 citation statements)

References 61 publications

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“…TCNQ chromophore is very sensitive to UV/Vis radiation. Various electronic states of TCNQ with different energy gaps result in different absorption peaks in UV/Vis spectra . The dissolved TCNQ species can be identified by the in situ UV/Vis absorption spectroscopy.…”

Section: Figuresupporting

confidence: 77%

A Metal–Organic Compound as Cathode Material with Superhigh Capacity Achieved by Reversible Cationic and Anionic Redox Chemistry for High‐Energy Sodium‐Ion Batteries

et al. 2017

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Although sodium-ion batteries (SIBs) are considered as alternatives to lithium-ion batteries (LIBs), the electrochemical performances,i np articular the energy density,a re muchl ower than LIBs. cuprous 7,7,8,, is presented as an ew kind of cathode material for SIBs.I tc onsists of both cationic (Cu II $Cu I )a nd anionic (TCNQ 0 $TCNQ À $ TCNQ 2À )r eversible redox reactions,d elivering ad ischarge capacity as high as 255 mAh g À1 at ac urrent density of 20 mA g À1 .T he synergistic effect of both redox-active metal cations and organic anions brings an electrochemical transfer of multiple electrons.T he transformation of cupric ions to cuprous ions occurs at near 3.80 Vv s. Na + /Na, while the full reduction of TCNQ 0 to TCNQ À happens at 3.00-3.30 V. The remarkably high voltage is attributed to the strong inductive effect of the four cyano groups.Li-rich layered transition metal oxides, xLi 2 MnO 3 · (1Àx)LiMO 2 (M = transition-metal ions), exhibiting ah igh specific capacity above 250 mAh g À1 ,a re regarded as the potential next-generation cathode materials for LIBs with high energy density. [1][2][3] In contrast to the redox reaction of transition metal ions in conventional layered oxides,the extra capacity of the Li-rich counterpart originates from the partial redox of oxygen anions. [4,5] Theu tilization of more complete oxygen species redox reaction also gives birth to lithium-air batteries with the highest energy density in the Li-ionshuttled batteries. [6,7] Sodium-ion batteries (SIBs) are accepted as low-cost, promising alternatives to LIBs,e specially in the large-scale energy storage applications. [8] How-ever the overall performances of SIBs are inferior to their Li analogues,a nd particularly the energy density,w hich is usually limited by the cathode materials.M any strategies have been proposed to enhance the cathode capacity. [9] However,a ll these efforts are limited by as pecific energy density of 680 Wh kg À1 ,w hich is far from the expectation of practical application. Inspired by the oxygen anion redox reactions in LIBs,w es uppose that taking use of the redox reactions of metallic cations and non-metallic anions simultaneously would realize the transfer reaction of multiple electrons and hence greatly increase the energy density of SIBs.H erein, our attempt of such strategy starts with ac onventional metal organic compound, CuTCNQ,w hich is composed of cuprous ions coordinated by TCNQ (TCNQ = 7,7,8,8-tetracyanoquinodimethane) ligands.TCNQ is aredoxactive compound via at wo-electron reversible reaction. [10][11][12] It is expected that the TCNQ À anions would participate in the electron transfer during the electrochemical redox reaction, while Cu ions also show redox activity in some metal-organic frameworks. [13] Recently,m etal-organic compounds have been investigated as cathode materials for LIBs.H owever, those materials suffer from poor electrochemical performance when applied in batteries. [13][14][15] Fortunately,i no ur work, we find that CuTCNQ as SIB cathode undergoes an electro...

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Section: Figuresupporting

confidence: 77%

A Metal–Organic Compound as Cathode Material with Superhigh Capacity Achieved by Reversible Cationic and Anionic Redox Chemistry for High‐Energy Sodium‐Ion Batteries

et al. 2017

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“…The organic radicals and radical ions have tremendous future potential in multiple fields pertaining to purely academics as well as applications and technology in the areas of energy storage [163,164], spintronics [16], quantum information processing [165] and sensing [166][167][168]. For example, the realization of a flexible radical battery from organic radicals is a major step forward towards the storage of solar or other renewable sources of energy.…”

Section: Discussionmentioning

confidence: 99%

Recent Advances in Organic Radicals and Their Magnetism

Kumar

Keshri

et al. 2016

Magnetochemistry

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Abstract:The review presents an overview of the organic radicals that have been designed and synthesized recently, and their magnetic properties are discussed. The π-conjugated organic radicals such as phenalenyl systems, functionalized nitronylnitroxides, benzotriazinyl, bisthiazolyl, aminyl-based radicals and polyradicals, and Tetrathiafulvalene (TTF)-based H-bonded radicals have been considered. The examples show that weak supramolecular interactions play a major role in modulating the ferromagnetic and antiferromagnetic properties. The new emerging direction of zethrenes, organic polyradicals, and macrocyclic polyradicals with their attractive and discrete architectures has been deliberated. The magnetic studies delineate the singlet-triplet transitions and their corresponding energies in these organic radicals. We have also made an attempt to collate the major organic neutral radicals, radical ions and radical zwitterions that have emerged over the last century.

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“…[29][30][31][32][33] Consequently,o rganic receptors with neutral binding, sites such as urea/thiourea, amide pyrrole, aminopyrrole, indole andh ydroxyl groups, [27,28,[34][35][36][37][38][39][40][41][42][43][44][45][46] with cationic units, such as ammonium, quinolinium, imidazolium andg uanidinium salts, [47][48][49][50][51] and sensors with active methylene groups [52][53][54] have been used for anion detection. In addition, anion-induced reactions, such as desilylation [55,56] and nucleophilic interactions, [57][58][59][60][61] have also been used for the anion detection. Many anion sensors have been utilised for significant applications, such as detection of cancer cells, [62] determination of percentage composition in binary solvent mixtures, [63] detection of water contaminants, [53,54] anion-detecting strips [64,65] and smart molecules.…”

Section: Anion Sensorsmentioning

confidence: 99%