120-07-0Relevant articles and documents
A BODIPY-based fluorescent sensor for the detection of Pt2+ and Pt drugs
Bian, Qingyuan,Kong, Fred Ka-Wai,Leung, Ken Cham-Fai,Ng, Maggie,Tang, Fung-Kit,Tse, Anfernee Kai-Wing,Tse, Yu-Chung,Yam, Vivian Wing-Wah,Zhu, Jiaqian
, p. 2695 - 2698 (2020)
A BODIPY-based fluorescent sensor PS with an NO4S2 podand ligand was studied for the selective detection of Pt2+ over 21 cations as well as selected platinum drugs in aqueous medium. The platinum sensor PS shows 28-fold, 22-fold and 14-fold fluorescence turn-on enhancements to Pt2+, cisplatin and nedaplatin, and was thereby employed to detect platinum drugs in A-549 human lung cancer cells.
Design, synthesis, linear and nonlinear photophysical properties of novel pyrimidine-based imidazole derivatives
Zhang, Qiong,Luo, Lei,Xu, Hong,Hu, Zhangjun,Brommesson, Caroline,Wu, Jieying,Sun, Zhaoqi,Tian, Yupeng,Uvdal, Kajsa
, p. 3456 - 3463 (2016)
Novel donor-π-acceptor (D-π-A) and donor-π-acceptor-π-donor (D-π-A-π-D) type pyrimidine imidazole derivatives with flexible ether chains (L1 and L2) have been efficiently synthesized through improved Knoevenagel condensation and Ullmann reactions with high yields. Based on systematic photophysical investigations and theoretical calculations, the structure-property relationships can be described as follows: (1) the linear and nonlinear optical properties of the target chromophores change regularly with increasing the number of branches and the polarity of the solvents. (2) The single-substituted chromophore L2 exhibited a remarkable negative solvato-kinetic effect, while the double-substituted chromophore L1 showed a positive solvato-kinetic effect. Significant bathochromic shifting of the emission spectra and larger Stokes shifts were observed in polar solvents. (3) The two-photon absorption (TPA) cross-section results further demonstrated that their TPA cross section values (δ) increase notably with increasing branch number, and the presence of high π-delocalization could induce large size-scalable TPA enhancements. (4) By comprehensively considering the optical performance, cytotoxicity and solubility, L1 was identified as the better candidate for living cell (HepG2) imaging.
Kinetic parameter estimation of solvent-free reactions monitored by 13C NMR spectroscopy, a case study: Mono- and di-(hydroxy)ethylation of aniline with ethylene carbonate
Lucchini, Vittorio,Fabris, Massimo,NoE, Marco,Perosa, Alvise,Selva, Maurizio
, p. 154 - 160 (2011)
The kinetics of solvent-free reactions can be followed in situ by 13C nuclear magnetic resonance (NMR) spectroscopy, provided that the reaction mixture can be maintained liquid at the monitoring temperature. The pros and cons of the technique and the correct translation of the signal intensities into concentrations are discussed. A good model for this investigation is the reaction of ethylene carbonate (1) with aniline (2) at 140°C, two alkylation products of N-mono- and N, N-bis-(2-hydroxy)ethylation of aniline form (compounds 3 and 4, respectively). The overall reaction occurs with heavy volume shrinking, so that the physical as well as the chemical features evolve during the course of the process. The chemical evolution is described by the kinetic constants k1 and k2 of the two N-alkylation steps, the physical evolution by the time-dependent activity coefficients α(t). Two complementary procedures are utilized for the determination of these parameters.
A Bis-Quinoline Appended Azobenzene Based Naked Eye Sensor for Selective Detection of Cd2+ Ion
Hrishikesan, Elango,Manjunath, Rangasamy,Kannan, Palaninathan
, p. 907 - 919 (2016)
A new azobenzene chromophore (AZQU), appended with a bis-quinoline unit as a turn-on chemosensor for selective detection of Cd2+ ions, has been designed and synthesized. The fluorescent receptor AZQU has an excellent selectivity and sensitivity towards Cd2+ ions over other metal ions in CH3CN:H2O (80:20, v/v) solution. AZQU is red colored and non-fluorescent in the absence of Cd2+ ions, but upon addition of Cd2+ ions it turns colorless with appreciable fluorescence. This “off–on” type signaling behavior is attributed to the CHEF (chelation-enhanced fluorescence) effect of the quinoline unit and the change in color from red to yellow occurs by an ICT process with Cd2+. The association constant for AZQU?+?Cd2+ was calculated to be 1.68?×?105 L·mol?1 with binding in the 1:1 stoichiometric ratio.
Synthesis of New Bis-1,2,4-Oxadiazoline Derivatives via 1,3-Dipolar Cycloaddition Reaction
Chen, Fei,Zeng, Hua,Liu, Fang-Ming
, p. 1866 - 1870 (2016)
A series of novel bis-oxadiazoline derivatives 4 was synthesized via 1,3-dipolar cycloaddition reaction of bis-aldimines 3, and nitrile oxides generated in situ from various benzohydroximinoyl chlorides in the presence of Et3N. The target products were confirmed by IR,1H-NMR, and mass spectrometry.
A fully-aqueous red-fluorescent probe for selective optical sensing of Hg2+ and its application in living cells
Pola, Murali Krishna,Ramakrishnam Raju, Mandapati V.,Lin, Chein-Ming,Putikam, Raghunath,Lin, Ming-Chang,Epperla, Chandra Prakash,Chang, Huan-Cheng,Chen, San-Yuan,Lin, Hong-Cheu
, p. 256 - 265 (2016)
A new red-fluorescent mercury ion sensor material is designed and synthesized, which is composed of a tweezer-shaped hydrophilic probe containing bifurcated soft-base atoms N and S coupled with 2-dicyanomethylene-3-cyano-4,5,5-trimethyl-2,5-dihydrofuran (TCF) unit. By virtue of the strong electron-accepting nature of TCF unit (as a push-pull chromophore), this designed sensor material can selectively detect Hg2+ over various tested metal ions in a 100% aqueous medium via naked-eye and photoluminescence (PL) observations. Theoretical and time-resolved photoluminescence measurements further confirmed the selectivity and reversibility of the probe towards Hg2+ via intramolocular charge transfer mechanism in this sensor material. Moreover, the living cell tests by confocal fluorescence images of this sensor material towards Hg2+ were also investigated. Finally, distinguished absorption changes and fluorescence quenching spectral appearances allowed us to present the selective optical indicator of Hg2+ via TCF moiety for the first time.
Hg2+ sensing in aqueous solutions: an intramolecular charge transfer emission quenching fluorescent chemosensors
Cheung, Sin-Man,Chan, Wing-Hong
, p. 8379 - 8383 (2006)
Compounds 4a and 4b, comprising an anthracene moiety as the fluorophore and a pair of dithiocarbamate functionalities as ligating groups, were designed as fluorescent chemosensors for Hg(II). In aqueous solvent systems, upon excitation, in addition to the normal emission bands of locally excited (LE) state of anthracene, both compounds show a prominent pH-independent intramolecular charge transfer (ICT) emissive band, which can be modulated by Hg2+ binding. The systems can be exploited to develop a fluorescent sensitive probe for Hg2+.
Synthesis, characterization and properties of NLO dye-containing polyurethane
Moon,Shim,Lee
, p. 91 - 97 (1994)
Polyurethane attached hemicyanine dye with tetraphenylborate anion was synthesized. This polymer was soluble in dimethylformamide and could be processed into thin film by spin coating. The poled polymer film showed a large second-order nonlinear optical coefficient (χ(2) = 4.0×10-7 esu) and good temporal stability.
Fluorescent probe molecule for detecting azo reductase based on coumarin derivative as well as preparation method and application of fluorescent probe molecule
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Paragraph 0083; 0086, (2021/07/17)
The invention provides a fluorescent probe molecule for detecting azo reductase based on a coumarin derivative as well as a preparation method and application of the fluorescent probe molecule, and belongs to the technical field of protease detection reagents. The fluorescent probe molecule prepared by the invention can provide a molecule combined with a specific biological enzyme-azo reductase, so that azo groups in a probe structure are reduced by the azo reductase, a fluorophore coumarin derivative is released, fluorescence of the probe molecule is changed, and an anticancer active drug phenylalanine mustard is released at the same time; therefore, the azo reductase in a liquid phase system is selectively identified and detected. Therefore, the invention provides the application of the fluorescent probe molecule in preparation of a reagent for detecting azo reductase and/or detection of Sn in a water body.
A water-soluble BODIPY based ‘OFF/ON' fluorescent probe for the detection of Cd2+ ions with high selectivity and sensitivity
Maity, Apurba,Ghosh, Utsav,Giri, Dipanjan,Mukherjee, Devdeep,Maiti, Tapas Kumar,Patra, Sanjib K.
supporting information, p. 2108 - 2117 (2019/02/12)
A water-soluble dilithium salt BODIPY derivative (LiBDP) with appended dicarboxylate pseudo-crown ether [NO4] coordinating sites has been designed, synthesized and characterized successfully for the selective and sensitive recognition of Cd2+ in aqueous media. The chemosensor exhibits a remarkable increase in fluorescence intensity as well as a distinct color change upon the addition of Cd2+ over other environmentally and biologically relevant metal ions in H2O. The fluorometric response of LiBDP is attributed to the metal chelation-enhanced fluorescence (MCHEF) effect which has been confirmed by a strong association constant of 2.57 ± 1.06 × 105 M?1 and Job's plot, indicating 1?:?1 binding stoichiometry between LiBDP and Cd2+. Frontier molecular orbital analysis (obtained from DFT studies) also illustrates the turn-on fluorescence of the probe by blocking photoinduced electron transfer (PET) after coordination to Cd2+. The probe can detect Cd2+ in a competitive environment up to a submicromolar level in a biologically significant pH range. The sensor is proved to be reversible and reusable by the alternative addition of Cd2+ followed by S2?. The OFF/ON/OFF sensing behavior is utilized to construct an INHIBIT molecular logic gate based on the two inputs of Cd2+ and S2? and a fluorescence intensity at 512 nm as an output. The test paper experiment demonstrates the practical utility of LiBDP to monitor Cd2+ in an aqueous sample. Finally, the sensing probe was utilized to monitor Cd2+ in living cells.