85754-58-1Relevant academic research and scientific papers
An A-π-A′ structural ratiometric fluorescent probe based on benzo[: E] indolium for bisulfite and its application in sugar samples and living cells
Sun, Yue,Li, Ying,Ma, Xiaotao,Duan, Lian
, p. 79830 - 79835 (2016)
An A-π-A′ structural ratiometric fluorescent probe 1 bearing a benzo[e]indolium moiety was developed for the detection of HSO3- in PBS buffer solution. HSO3- was expected to react with probe 1via a Michael addition reaction, causing dramatic changes in its emission spectrum (from 578 nm to 466 nm) and an obvious color change from orange red to blue which could be observed by the naked eye. The reaction could be complete in 30 seconds in the sensing system, and displayed a high selectivity and sensitivity for HSO3- with a detection limit of 15 nM. The practical value of the probe was confirmed for application to detect the level of HSO3- in sugar samples with good recovery and in living cells.
Knoevenagel condensation in aqueous media promoted by 2,2′-bipyridinium dihydrogen phosphate as a green efficient catalyst
Darvishzad, Shila,Daneshvar, Nader,Shirini, Farhad,Tajik, Hassan
, p. 2973 - 2984 (2021/04/19)
A 2,2′-Bipyridine-based ionic compound named 2,2′-bipyridinium dihydrogen phosphate was synthesized by addition of phosphoric acid to a solution of 2,2′-Bipyridine in dichloromethane. After the characterization using FT-IR, mass, 1H, 13C and 31P NMR techniques, it was used as a Bronsted dicationic acidic catalyst for the promotion of the synthesis of 2-arylidene malononitrile and 5-arylidene barbituric acid derivatives via Knoevenagel condensation reaction in water. Some of the advantages of this method are the utilization of an easy preparable, cost-effective and eco-friendly organic salt as a catalyst within high rates and yields of the reactions, simple and quick work-up and acceptable reusability of the catalyst.
Preparation of a Pickering emulsion by modification of an amine-functionalized graphene oxide surface with organosilane: Efficient catalyst for the Knoevenagel condensation of malononitrile with aldehydes at mild temperature
Qian, Bingxu,Wang, Fei,Li, Dongsheng,Li, Yongxin,Zhang, Bo,Zhu, Jie
, p. 5995 - 6002 (2020/04/24)
In this study, a series of Pickering emulsions for catalysis of Knoevenagel condensations of malononitrile with aldehydes were prepared by surface modification of amine-functionalized graphene oxide (GO-NH2) with trimethoxymethylsilane (MTMS).
Photodissociation and kinetics of bis-2-benzylidenemalononitrile (BBM) in different micelles environment
Panja, Sumit Kumar
, (2020/07/13)
In present work, photodissociation kinetics of selective C[dbnd]C bond in BBM is investigated in different micelles concentration. In polar solvents, rate of photodissociation (k) is relatively lower compared to H2O solvent under similar condit
A novel porphyrin derivative, composition for detecting cyanide ion comprising the same and method for detecting cyanide ion using the same
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Paragraph 0072-0073; 0083-0084; 0091, (2019/05/01)
The present invention provides a novel dicyanovinyl porphyrin compound, a composition for detecting cyanide ion containing the same, and a method for detecting cyanide ion using the same. The dicyanovinyl porphyrin compound, the composition for detecting cyanide ion containing the same and the method for detecting cyanide ion using the same of the present invention can be usefully used as a cyanide ion specific detection technique in a field of cyanide ion detection.COPYRIGHT KIPO 2019
Selective photodissociation of highly photoactive Bis-2-benzylidenemalononitrile in solution
Kumar Panja, Sumit,Koley, Suvajit,Boumediene, Haddad
, p. 18 - 23 (2019/02/19)
Photophysical study of highly photoactive bis-2-benzylidenemalononitrile (BBM) has been investigated in solution using UV–vis, fluorescence and NMR spectroscopic techniques. The seletive photodissociation can be attributed to the presence of hi
New donor-acceptor chromophores by formal [2+2] cycloaddition of donor-substituted alkynes to dicyanovinyl derivatives
Jarowski, Peter D.,Wu, Yi-Lin,Boudon, Corinne,Gisselbrecht, Jean-Paul,Gross, Maurice,Schweizer, W. Bernd,Diederich, Franois
experimental part, p. 1312 - 1322 (2009/12/04)
The efficient methodology of the cycloaddition between electron-rich alkynes and tetracyanoethylene (TCNE) or 7,7,8,8-tetracyanoquinodimethane (TCNQ), followed by retro-electrocyclisation, is extended to dicyanovinyl derivatives to produce new donor-acceptor push-pull 1,1-dicyanobutadienyl chromophores in excellent to quantitative yield (63-98%) that express strong charge-transfer (CT) absorptions from 300 to 600 nm. The scope of this reaction is established by both varying the nucleophilic and electrophilic components. Electrochemical studies show that the CT properties of these systems are readily tunable by substitution on the electrophile, which has the largest effect on the lowest unoccupied molecular orbital (LUMO). Non-reversible reduction potentials range from ca.-1.2 to -1.9 V in CH2Cl2, against the ferricinium/ferrocene couple (Fc+/Fc) according to cyclovoltammetry (CV) and rotating disk voltammetry (RDV). The chromophores show a significant non-planarity between the N,N-dimethylanilino donor and the 1,1-dicyanovinyl acceptor moieties, with torsional angles around 40° from X-ray analysis, but retain strong quinoidal character. The mechanism of this reaction has been studied computational using density functional methods in the gas-phase and using the polarizable continuum model (PCM) for addressing solvent effects. The complete reaction free-energy profile has been determined for the reaction of 1,1-dicyanoethene and 4-ethynyl-N,N-dimethylaniline. The process proceeds through formal [2+2] cycloaddition followed by retro- electrocyclisation. The formation of a zwitterionic intermediate in the cycloaddition step is shown.
Charge Resonance and Charge Transfer Interactions of Photogenerated Dicyanovinylstyrylpyridinyl Radicals in Solutions at Room Temperature
Nagamura, Toshihiko,Ichihara, Takashi,Kawai, Hideki
, p. 9370 - 9376 (2007/10/03)
Charge resonance and charge transfer interactions of dicyanovinylstyrylpyridinyl radicals were observed at room temperature in organic solvents by steady photolysis with absorption and ESR spectroscopy.Excitation of dicyanovinylstyrylpyridinium salts with
