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Kumari A, Sharma S, Sengupta S. Molecular rotors of naphthalimide and benzodithiophene as effective solvent polarity probes, temperature sensors, and for g-C 3 N 4 sensitization. Photochem Photobiol 2024. [PMID: 38459693 DOI: 10.1111/php.13931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 02/07/2024] [Accepted: 02/22/2024] [Indexed: 03/10/2024]
Abstract
Acceptor-donor-acceptor (A-D-A) molecular rotors have drawn substantial attention for their applications in monitoring temperature variations within cellular microenvironments, biomimetic photocatalysis, and bioimaging. In this study, we have synthesized two novel rotor molecules, NBN1 and NBN2, by incorporating benzodithiophene (BDT) as the donor core and naphthalic anhydride/naphthalimide (NA/NI) moieties as acceptors using Pd-catalyzed Stille coupling reactions. These molecules exhibited distinct charge transfer (CT) behavior in both their absorption and emission spectra and displayed prominent emission solvatochromism. Notably, NBN1 exhibited better CT properties among the two molecules. Moreover, these A-D-A molecular rotors demonstrated remarkable sensitivities of their emission spectra toward solvent polarities and temperatures. Rotors NBN1 and NBN2 showed positive temperature coefficients with internal temperature sensitivities of 0.34% °C-1 and 0.13% °C-1 in chloroform, respectively, and thus hold significant promise for detecting temperature variations in cellular microenvironment. Furthermore, we have modeled these molecules with graphitic carbon nitride (g-C3 N4 ) to form composite systems and performed theoretical calculations to obtain valuable insights into their charge transfer behavior. Theoretical results suggested that these molecules have the potential to efficiently sensitize and modulate the band gap of g-C3 N4 and show potential for diverse photocatalytic applications.
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Affiliation(s)
- Anita Kumari
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Mohali, India
| | - Sushil Sharma
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Mohali, India
| | - Sanchita Sengupta
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Mohali, India
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Mehta R, Kumar S. ESIPT-based dual-emissive perimidine derivative as a rapid and sensitive sensor for Cu 2+ and Al 3+: Construction of memory device, 2-to-1 encoder and 1-to-2 decoder. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 293:122471. [PMID: 36801732 DOI: 10.1016/j.saa.2023.122471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 01/24/2023] [Accepted: 02/04/2023] [Indexed: 06/18/2023]
Abstract
An ESIPT based fluorescent perimidine derivative oPSDAN was developed and characterized by 1H NMR, 13C NMR and mass spectroscopy. The study of the photo-physical properties of the sensor unveiled its selectivity and sensitivity towards Cu2+ and Al3+ ions. The sensing of ions was accompanied by colorimetric change (for Cu2+) as well as emission turn-off response. The binding stoichiometries of sensor oPSDAN with Cu2+ ion and Al3+ ions were determined to be 2:1 and 1:1, respectively. The binding constants and detection limits for Cu2+ and Al3+ were calculated from the UV-vis and fluorescence titration profiles as, 7.1 × 104 M-1, 1.9 × 104 M-1 and 9.89 nM, 1.5 × 10-8 M, respectively. The mechanism was established by 1H NMR as well as mass titrations and was supported by DFT and TD-DFT calculations. The UV-vis and fluorescence spectral results were further utilized for construction of memory device, encoder and decoder. Sensor-oPSDAN was also tested for determining Cu2+ ions in drinking water.
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Affiliation(s)
- Ruhi Mehta
- Department of Chemistry, Multani Mal Modi College, Patiala 147001, Punjab, India
| | - Sanjay Kumar
- Department of Chemistry, Multani Mal Modi College, Patiala 147001, Punjab, India.
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A green protocol for the electrochemical synthesis of a fluorescent dye with antibacterial activity from imipramine oxidation. Sci Rep 2022; 12:4921. [PMID: 35318352 PMCID: PMC8941072 DOI: 10.1038/s41598-022-08770-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 03/02/2022] [Indexed: 12/31/2022] Open
Abstract
Electrochemical oxidation of imipramine (IMP) has been studied in aqueous solutions by cyclic voltammetry and controlled-potential coulometry techniques. Our voltammetric results show a complex behavior for oxidation of IMP at different pH values. In this study, we focused our attention on the electrochemical oxidation of IMP at a pH of about 5. Under these conditions, our results show that the oxidation of IMP leads to the formation of a unique dimer of IMP (DIMP). The structure of synthesized dimer is fully characterized by UV-visible, FTIR, 1H NMR, 13C NMR and mass spectrometry techniques. It seems that the first step in the oxidation of IMP is the cleavage of the alkyl group (formation of IMPH). After this, a domino oxidation-hydroxylation-dimerization-oxidation reaction, converts IMPH to (E)-10,10',11,11'-tetrahydro-[2,2'-bidibenzo[b,f]azepinylidene]-1,1'(5H,5'H)-dione (DIMP). The synthesis of DIMP is performed in an aqueous solution under mild conditions, without the need for any catalyst or oxidant. Based on our electrochemical findings as well as the identification of the final product, a possible reaction mechanism for IMP oxidation has been proposed. Conjugated double bonds in the DIMP structure cause the compound to become colored with sufficient fluorescence activity (excitation wave-length 535 nm and emission wave-length 625 nm). Moreover, DIMP has been evaluated for in vitro antibacterial. The antibacterial tests indicated that DIMP showed good antibacterial performance against all examined gram-positive and gram-negative bacteria (Staphylococcus aureus, Bacillus cereus, Escherichia coli and Shigella sonnei).
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Solid Fluorescence pH Sensors Based on 1,8-Naphthalimide Copolymers Synthesized by UV Curing. CHEMOSENSORS 2022. [DOI: 10.3390/chemosensors10020073] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Novel water-swollen photo-crosslinked membranes were obtained by copolymerization of the N-vinylpyrrolidone, butyl acrylate and ethyl methacrylate monomers functionalized with naphthalimide groups, as pH sensitive fluorescence probes. For that purpose, two monomers with pending naphthalimide groups anchored to ethyl methacrylate through alkyl chains with different length, were previously synthesized. The membranes were characterized using different techniques. The pH dependence of absorbance and the corresponding quenching of fluorescence were investigated and related to the structure of naphthalimide substituents linked to the membrane. The new solid sensors exhibited sensitive fluorescence changes at pH < 3, and lower time response was determined for membranes where the sensing group was linked through longer alkyl chain to the polymer matrix. The membranes were solid, thermally stable and easily handled to be applied as sensor materials, and showed a reversible behavior, which is an important feature for further fabrication of an economical on-site tool for the acidity detection in aqueous environments.
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Sun X, Xue Y, Li J, Yang Y, Bai Y, Chen Y. Fluorescent labeling and characterization of dicarboxylic cellulose nanocrystals prepared by sequential periodate-chlorite oxidation. RSC Adv 2021; 11:24694-24701. [PMID: 35481032 PMCID: PMC9036875 DOI: 10.1039/d1ra04812k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 07/08/2021] [Indexed: 12/19/2022] Open
Abstract
High-performance fluorescent composites are key to the development and improvement of fluorescent molecular probe technology. In this study, cellulose nanocrystals (CNC) with high carboxyl concentrations were prepared via sequential periodate-chlorite oxidation. Then, fluorescent cellulose nanocrystals (FCNC) were prepared by attaching 7-amino-4-methylcoumarin (AMC) onto CNC under 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMTMM) catalysis. The morphology and fluorescence properties of FCNC were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, elemental analysis, ultraviolet-visible absorbance, fluorescence spectrophotometry, and fluorescence spectroscopy. The results showed that AMC was grafted onto the CNC surface by an amidation reaction, and the absorption and emission maxima for FCNC were blue-shifted from 350 nm and 445 nm of AMC to 335 nm and 440 nm, respectively. FCNC retained the crystallinity and nano-topography size of the CNC. The fluorescence intensity, quantum yield, and fluorescence lifetime of FCNC showed the same change law; it first increased and then decreased with an increase in the graft density of AMC from 0.201 to 0.453 AMC molecules per nm2. The FCNC prepared in this study have good optical properties and can be used in the fields of fluorescent molecular probes and biological imaging.
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Affiliation(s)
- Xiaozheng Sun
- College of Engineering, Northeast Agricultural University No. 600 Changjiang Street HarBin 150030 China
| | - Yanhua Xue
- College of Engineering, Northeast Agricultural University No. 600 Changjiang Street HarBin 150030 China
| | - Jianye Li
- College of Engineering, Northeast Agricultural University No. 600 Changjiang Street HarBin 150030 China
| | - Yu Yang
- College of Engineering, Northeast Agricultural University No. 600 Changjiang Street HarBin 150030 China
| | - Yu Bai
- College of Engineering, Northeast Agricultural University No. 600 Changjiang Street HarBin 150030 China
| | - Yujia Chen
- College of Engineering, Northeast Agricultural University No. 600 Changjiang Street HarBin 150030 China
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Staneva D, Vasileva-Tonkova E, Grozdanov P, Vilhelmova-Ilieva N, Nikolova I, Grabchev I. Synthesis and photophysical characterisation of 3-bromo-4-dimethylamino-1,8-naphthalimides and their evaluation as agents for antibacterial photodynamic therapy. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112730] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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7
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Nicolescu A, Airinei A, Georgescu E, Georgescu F, Tigoianu R, Oancea F, Deleanu C. Synthesis, photophysical properties and solvatochromic analysis of some naphthalene-1,8-dicarboxylic acid derivatives. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112626] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Hosseinnezhad M, Gharanjig K, Moradian S, Tafaghodi S. Synthesis and application of some novel fluorescent heterocyclic disperse dyestuffs based on phenothiazine on polyester. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2014.12.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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9
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Abd El‐Aziz DM, El‐Wakiel N, Gaber M. Fluorescent UO
2
(II) and ZrO(II) complexes: Synthesis, structural characterization, fluorescence, DNA binding studies and biological applications in cell probing. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4855] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
| | - Nadia El‐Wakiel
- Chemistry Department, Faculty of ScienceTanta University Tanta Egypt
| | - Mohamed Gaber
- Chemistry Department, Faculty of ScienceTanta University Tanta Egypt
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10
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Fluorescent and colourimetric 1, 8-naphthalimide-appended chemosensors for the tracking of metal ions: selected examples from the year 2010 to 2017. CHEMICAL PAPERS 2018. [DOI: 10.1007/s11696-018-0411-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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11
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Pilehkouhi M, Shaki H, Khosravi A, Khorasani M, Zamani E. Synthesis and Characterization of a Fluorescent Water-Borne Polyurethane Based on a Novel Naphthalimide Dye. J MACROMOL SCI B 2018. [DOI: 10.1080/00222348.2018.1435501] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Milad Pilehkouhi
- Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Tehran, Iran
| | - Hanieh Shaki
- Department of Chemical Engineering, Golestan University, Gorgan, Iran
| | - Alireza Khosravi
- Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Tehran, Iran
| | - Manochehr Khorasani
- Color and Polymer Research Center, Amirkabir University of Technology, Tehran, Iran
| | - Ehsan Zamani
- Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Tehran, Iran
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12
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Shaki H. Novel monoazo disperse and cationic dyes: preparation, structure investigation, study of spectroscopic, antibacterial and antifungal potential. MONATSHEFTE FUR CHEMIE 2018. [DOI: 10.1007/s00706-017-2130-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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13
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Ziarani GM, Moradi R, Lashgari N, Kruger HG. Imide Dyes. METAL-FREE SYNTHETIC ORGANIC DYES 2018:171-176. [DOI: 10.1016/b978-0-12-815647-6.00011-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
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14
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Wang L, Wang G, Shang C, Kang R, Fang Y. Naphthalimide-Based Fluorophore for Soft Anionic Interface Monitoring. ACS APPLIED MATERIALS & INTERFACES 2017; 9:35419-35426. [PMID: 28925686 DOI: 10.1021/acsami.7b10565] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A naphthalimide-based low-molecular-mass fluorophore (NA) was designed and synthesized by introducing an azetidine unit onto the aromatic ring of the compound as an electron-donating structure, and a hydrophilic (2-(2-aminoethyl-amino)ethanol) moiety into the "N-imide site" of the core structure. UV-vis absorption and fluorescence measurements revealed that the fluorophore is soluble in water and shows a fluorescent quantum yield of ∼20% and lifetime of ∼3.7 ns in the solvent within a wide pH range. Moreover, the fluorescence emission and anisotropy of the fluorophore as produced are both dependent upon the viscosity and polarity of the medium. Further studies demonstrated that NA can be used as a selective probe to monitor the aggregation of anionic surfactants owing to its accumulation onto the anionic surfaces of the aggregates as formed. Inspired by the discovery, NA was successfully applied for detection of cell membranes and E. coli via monitoring of their negatively charged surfaces, which is important for fast checking of biological contamination of water. Importantly, all the tests could be performed in a visualized manner. We believe that the new, low-molecular-mass fluorophore as created may find applications in chemical and biochemical sensing and imaging.
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Affiliation(s)
- Li Wang
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University , Xi'an 710062, P. R. China
| | - Gang Wang
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University , Xi'an 710062, P. R. China
| | - Congdi Shang
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University , Xi'an 710062, P. R. China
| | - Rui Kang
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University , Xi'an 710062, P. R. China
| | - Yu Fang
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University , Xi'an 710062, P. R. China
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15
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Synthesis and investigation of antimicrobial activity and spectrophotometric and dyeing properties of some novel azo disperse dyes based on naphthalimides. Biotechnol Prog 2015; 31:1086-95. [DOI: 10.1002/btpr.2107] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 04/11/2015] [Indexed: 11/07/2022]
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16
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Panchenko PA, Fedorova OA, Fedorov YV. Fluorescent and colorimetric chemosensors for cations based on 1,8-naphthalimide derivatives: design principles and optical signalling mechanisms. RUSSIAN CHEMICAL REVIEWS 2014. [DOI: 10.1070/rc2014v083n02abeh004380] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Synthesis of New Blue Fluorescent Polymerizable 1,8-Naphthalimides and Their Copolymers with Styrene as Sensors for Fe(III) Cations. J CHEM-NY 2014. [DOI: 10.1155/2014/793721] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The synthesis, characterization, and functional properties of two new polymerizable 1,8-naphthalimides (MDs) have been described. Their copolymers with styrene designed to act as a fluorescence PET chemosensor have been investigated. The study also reports the influence of different metal cations (Ag+, Mg2+, Cu2+, Sr2+, Co2+, Pb2+, and Fe3+) on the fluorescence intensity of both low and high molecular weight fluorophores.
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Wang SQ, Gao Y, Wang HY, Zheng XX, Shen SL, Zhang YR, Zhao BX. Synthesis, X-ray crystal structure and optical properties of novel 1,3,5-triarylpyrazoline derivatives and the fluorescent sensor for Cu2+. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 106:110-117. [PMID: 23376266 DOI: 10.1016/j.saa.2012.12.062] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 11/29/2012] [Accepted: 12/13/2012] [Indexed: 06/01/2023]
Abstract
A series of novel 1,3,5-triarylpyrazoline derivatives was synthesized by the reaction of chalcone and 5-aryl-2-hydrazinyl-1,3,4-thiadiazole in 43.3-84.7% yields. The structures of compounds were characterized using IR, (1)H NMR and HRMS spectroscopy and X-ray diffraction analysis. The absorption and fluorescence characteristics of the compounds were investigated in dichloromethane, toluene, acetonitrile, N,N-dimethylformamide and tetrahydrofuran. The results showed that the absorption maxima of the compounds vary from 366 to 370nm depending on the group bound to benzene rings. The maximum emission spectra of the compounds in dichloromethane were dependent on nature of groups in benzene ring. Furthermore, the compound 3b can be used to determine Cu(2+) ion with high selectivity and a low detection limit in the DMF:H2O=1:1 (v/v) solution.
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Affiliation(s)
- Sheng-Qing Wang
- Institute of Organic Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China
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Theoretical investigation into optical and electronic properties of 1,8-naphthalimide derivatives. J Mol Model 2013; 19:1685-93. [DOI: 10.1007/s00894-012-1734-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2012] [Accepted: 12/13/2012] [Indexed: 10/27/2022]
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20
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Stoyanov S, Petrov P, Stoyanova M, Dangalov M, Shivachev B, Nikolova R, Petkov I. 4-Amino-3-nitro naphthalimides—Structures and spectral properties. J Photochem Photobiol A Chem 2012. [DOI: 10.1016/j.jphotochem.2012.10.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Ma L, Qian J, Tian H, Lan M, Zhang W. A colorimetric and fluorescent dual probe for specific detection of cysteine based on intramolecular nucleophilic aromatic substitution. Analyst 2012; 137:5046-50. [PMID: 22970425 DOI: 10.1039/c2an35624d] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
4-Nitro-1,8-naphthalic anhydride (NNA) was used to distinguish cysteine from homocysteine and other potentially interfering thiols through a novel sequential substitution mechanism. The discrimination involves a blue-fluorescent thioether formation via nucleophilic aromatic substitution of the nitro group by thiol, followed by a second intramolecular nucleophilic aromatic substitution of alkylthio with the amino group to give the green-fluorescent 4-amino derivative. NNA is highly selective towards Cys, and the detection limit of Cys by this method is 0.3 μM.
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Affiliation(s)
- Limin Ma
- Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, PR China
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Zheng LW, Gong ZL, Liu WL, Liu YR, Zhao BX. Synthesis, X-ray crystal structure and fluorescent spectra of novel pyrazolo[1,5-a]pyrazin-4(5H)-one derivatives. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 81:372-379. [PMID: 21733750 DOI: 10.1016/j.saa.2011.06.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2011] [Revised: 06/05/2011] [Accepted: 06/13/2011] [Indexed: 05/31/2023]
Abstract
A series of fluorescent compounds, containing pyrazolo[1,5-a]pyrazin-4(5H)-one moiety, were designed and synthesized from ethyl 1-(2-oxo-2-phenylethyl)-3-phenyl-1H-pyrazole-5-carboxylates. The structures of the compounds have been confirmed by IR, (1)H NMR, HRMS and X-ray crystal diffraction. The optical properties of the compounds were investigated by UV-vis absorption and fluorescence spectroscopy. The effect of pH on the UV-vis absorption of compound 2a in methanol-H(2)O solutions was studied and interpreted by theory calculation. The pK(a) value of compound 2a was determined by the absorption spectra.
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Affiliation(s)
- Liang-Wen Zheng
- Institute of Organic Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China
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