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Rohman MA, Phanrang PT, Chamlagai D, Mitra S. Deciphering Spectroscopic and Structural Insights into the Photophysical Behavior of 2,2'-Dipyridylamine: An Efficient Environment Sensitive Fluorescence Probe. J Phys Chem A 2021; 125:6964-6975. [PMID: 34372657 DOI: 10.1021/acs.jpca.1c04772] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Excited state deactivation properties and the effects of solvent hydrogen bonding (HB) on the photophysical behavior of 2,2'-dypyridylamine (DPyA) were investigated by steady state and time-resolved fluorescence experiments, molecular docking, and density functional theory (DFT) calculations. In addition to the polarity effect, the contributions of solvent HB donation (HBD) acidity and HB acceptance (HBA) basicity to modulate the solvatochromic spectral properties were estimated from multiparametric linear regression analysis using Kamlet-Taft (KT) and Catalán formalisms. The importance of C-N bond torsion, leading to the trans → cis conversion, was manifested by substantial increase in DPyA fluorescence yield in the presence of cyclodextrin (CD) and glycerol. The unusually low fluorescence yield in aqueous medium was explained on the basis of synergistic effect of solvent hydrogen bonding combined with excited state conformational isomerization, which renders DPyA to be an excellent environment sensitive fluorescence reporter. The experimental results were verified with structural insights obtained from DFT calculations at B3LYP/6-311++G(d,p) level and construction of potential energy surface (PES) in the ground state as well as in the excited states.
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Affiliation(s)
| | | | - Dipak Chamlagai
- Department of Chemistry, North-Eastern Hill University, Shillong-793022, India
| | - Sivaprasad Mitra
- Department of Chemistry, North-Eastern Hill University, Shillong-793022, India
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2
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Deng T, Hong P, Hao C, Fu Y. TDDFT investigation on the solvent effect of methanol on the electronic structure and luminescence of metal organic framework CdL2. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2019.03.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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3
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Quantum chemical approach for chemiluminescence characteristics of di-substituted luminol derivatives in polar solvents. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.01.110] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Rohman MA, Baruah P, Bhattacharjee D, Myrboh B, Mitra S. Fluorescence solvatochromism and modulated anticholinergic activity of novel coumarin compounds sequestered in human serum albumin nanocavities. NEW J CHEM 2019. [DOI: 10.1039/c9nj03293b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The antagonistic effect of the HSA matrix towards the acetylcholinesterase inhibition potencies of novel coumarin compounds is probed by multi-spectroscopic techniques.
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Affiliation(s)
- Mostofa Ataur Rohman
- Centre for Advanced Studies in Chemistry
- North-Eastern Hill University
- Shillong 793 022
- India
| | - Prayasee Baruah
- Centre for Advanced Studies in Chemistry
- North-Eastern Hill University
- Shillong 793 022
- India
| | | | - B. Myrboh
- Centre for Advanced Studies in Chemistry
- North-Eastern Hill University
- Shillong 793 022
- India
| | - Sivaprasad Mitra
- Centre for Advanced Studies in Chemistry
- North-Eastern Hill University
- Shillong 793 022
- India
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5
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Rohman MA, Baruah P, Yesylevskyy SO, Mitra S. Specific solvent effect on the photophysical behavior of substituted chromones: A combined fluorescence, DFT and MD study. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2018.09.042] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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6
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Sonu VK, Mitra S. Quenching of Luminol Fluorescence at Nano-Bio Interface: Towards the Development of an Efficient Energy Transfer System. J Fluoresc 2018; 29:165-176. [PMID: 30519975 DOI: 10.1007/s10895-018-2324-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 11/05/2018] [Indexed: 10/27/2022]
Abstract
Surface modified colloidal gold (Au) and silver (Ag) nanoparticles (NPs) were used as efficient quenchers of luminol (LH2) fluorescence either in homogeneous aqueous medium or its noncovalent assembly with bovine serum albumin (BSA). The mechanism as well as the extent of fluorescence quenching was found to be strongly dependent on the nature of the nanoparticles. While simple static type fluorescence quenching mechanism was perceived with AuNP, a more complex protocol involving quenching sphere model was envisaged for AgNP quenching. Nevertheless, the magnitude of Stern-Volmer (SV) quenching constant (KSV ~ 108-1010 M-1) was calculated to be ca. 104 times more for surface quoted NPs in comparison with BSA-NP bioconjugates system. On the other hand, a highly efficient (E ≈ 95%) energy transfer (ET) process was predicted for LH2 captured in the hydrophobic assembly with BSA in presence of AgNP as an acceptor. The ET efficiency is critically dependent on the concentration of BSA and nicely correlated with the extent of NP surface coverage. However, fluorescence quenching on AuNP surface is relatively less responsive towards protein concentration, primarily due to the difference in surface activity as well as the mode of interaction of the protein with NPs. Graphical Abstract Energy transfer from excited luminol to metal nanoparticles is strongly modulated in presence of serum albumins.
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Affiliation(s)
- Vikash Kumar Sonu
- Centre for Advanced Studies, Department of Chemistry, North-Eastern Hill University, Shillong, 793022, India
| | - Sivaprasad Mitra
- Centre for Advanced Studies, Department of Chemistry, North-Eastern Hill University, Shillong, 793022, India.
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Hessz D, Bojtár M, Mester D, Szakács Z, Bitter I, Kállay M, Kubinyi M. Hydrogen bonding effects on the fluorescence properties of 4'-diethylamino-3-hydroxyflavone in water and water-acetone mixtures. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 203:96-105. [PMID: 29860173 DOI: 10.1016/j.saa.2018.05.104] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 05/21/2018] [Accepted: 05/27/2018] [Indexed: 06/08/2023]
Abstract
The fluorescence properties of 4'-diethylamino-3-hydroxyflavone (FET), a dye probe sensitive to the polarity as well as the hydrogen bonding ability of its environment, have been studied in acetone-water mixtures by measuring spectra and decay curves over the whole composition range and analyzing the results on the basis of theoretical calculations. In acetone, like in most of organic solvents, the dye showed dual fluorescence, due to an excited state intramolecular proton transfer (ESIPT), in which a quasi-equilibrium between the two excited species, N* and T*, was reached. In acetone-water mixtures with lower molar fractions of water, where the water molecules are largely dispersed, only one type of hydrate could be detected, a complex with 1:1 composition, showing only N* emission, but with a high (0.45) fluorescence quantum yield. At higher water concentrations, the interaction of FET with the hydrogen-bonded water clusters resulted in fluorescence quenching. In neat water the fluorescence quantum yield fell to ~0.001. Theoretical calculations on a FET-acetone complex, a FET-water complex and a FET-water-acetone triple complex (the latter as model for the samples with low water concentrations) concluded that ESIPT was energetically favored in all the models, but the E(N*)-E(T*) energy difference for the water complexes was much lower. The kinetic barrier of ESIPT was found greatly higher in the FET-water complex than in the isolated solute. The intermolecular hydrogen bonds in the water complexes became significantly stronger following the excitation, stabilizing the N* form of the hydrated dye.
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Affiliation(s)
- Dóra Hessz
- Institute of Materials and Environmental Chemistry, Research Center for Natural Sciences, Hungarian Academy of Sciences, 1519 Budapest, P.O. Box 286, Hungary
| | - Márton Bojtár
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - Dávid Mester
- MTA-BME Lendület Quantum Chemistry Research Group, Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - Zoltán Szakács
- Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - István Bitter
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - Mihály Kállay
- MTA-BME Lendület Quantum Chemistry Research Group, Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - Miklós Kubinyi
- Institute of Materials and Environmental Chemistry, Research Center for Natural Sciences, Hungarian Academy of Sciences, 1519 Budapest, P.O. Box 286, Hungary; Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, 1521 Budapest, Hungary.
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An enzymatic calculation system based on electrochemiluminescence and fluorescence of luminol and cyclic voltammetry of ferrocene methanol. Biosens Bioelectron 2018; 118:44-50. [DOI: 10.1016/j.bios.2018.07.043] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 07/12/2018] [Accepted: 07/18/2018] [Indexed: 12/16/2022]
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9
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Khan SA, Asiri AM, Al-Dies AAM, Osman OI, Asad M, Zayed ME. One-pot synthesis, physicochemical and photophysical properties of deep blue light-emitting highly fluorescent pyrene-imidazole dye: A combined experimental and theoretical study. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.06.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Wang M, Xie W, Li A, Xu S. Structural Basis and Mechanism of Chiral Benzedrine Molecules Interacting With Third Dopamine Receptor. Chirality 2016; 28:674-85. [PMID: 27581600 DOI: 10.1002/chir.22630] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 07/12/2016] [Accepted: 07/15/2016] [Indexed: 11/09/2022]
Abstract
In order to investigate the chiral benzedrine molecules corresponding to their different characteristics in biochemical systems, we studied their interaction with D3 R using the docking method, molecular dynamic simulation, and quantum chemistry. The obtained results indicate that the active residues for R-benzedrine (RAT) bound with D3 R are Ala132, Asp133, and Tyr55, while Asn57, Asp133, Asp168, Cys172, Gly54, Trp24, and Vall136 act as the active residues for S-benzedrine (SAT). The different active pockets are observed for ART or SAT because they possess different active residues. The binding energies between RAT and SAT with D3 R were determined to be -44.0 kJ.mol(-1) and -71.2 kJ.mol(-1) , respectively. These results demonstrate that SAT within the studied pocket of D3 R has a stronger capability of binding with D3 R, while it is more feasible for RAT to leave from the interior positions of D3 R. In addition, the results suggest that the D3 R protein can recognize chiral benzedrine molecules and influence their different addictive and pharmacological effects in biochemical systems. Chirality 28:674-685, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Ming Wang
- Key Laboratory of Education Ministry for Medicinal Chemistry of Natural Resource, College of Chemical Science and Technology, Yunnan University, Kunming, China
| | - Wei Xie
- Key Laboratory of Education Ministry for Medicinal Chemistry of Natural Resource, College of Chemical Science and Technology, Yunnan University, Kunming, China
| | - Aijing Li
- Key Laboratory of Education Ministry for Medicinal Chemistry of Natural Resource, College of Chemical Science and Technology, Yunnan University, Kunming, China
| | - Sichuan Xu
- Key Laboratory of Education Ministry for Medicinal Chemistry of Natural Resource, College of Chemical Science and Technology, Yunnan University, Kunming, China.
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11
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Singh N, Khan IM, Ahmad A, Javed S. Synthesis, spectrophotometric and thermodynamic studies of charge transfer complex of 5,6-dimethylbenzimidazole with chloranilic acid at various temperatures in acetonitrile and methanol solvents. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.06.081] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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12
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Zhang H, Zhou G, Fan R, Wang X, Yang Y. Two Novel Cu/Mn Metal-Organic Framework Based on Aromatic Dicarboxylic Acid: Synthesis, Crystal Structure, Thermal Stability, and Luminescence Properties. ACTA ACUST UNITED AC 2016. [DOI: 10.1080/15533174.2015.1004444] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Huijie Zhang
- Department of Chemistry, Harbin Institute of Technology, Harbin, P. R. China
| | - Guangpeng Zhou
- College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, P. R. China
| | - Ruiqing Fan
- Department of Chemistry, Harbin Institute of Technology, Harbin, P. R. China
| | - Xinming Wang
- Department of Chemistry, Harbin Institute of Technology, Harbin, P. R. China
| | - Yulin Yang
- Department of Chemistry, Harbin Institute of Technology, Harbin, P. R. China
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13
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Phukan S, Saha M, Pal AK, Bhasikuttan A, Mitra S. Intramolecular charge transfer in coumarin based donor-acceptor systems: Formation of a new product through planar intermediate. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2015.02.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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14
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Chi S, Xie W, Zhang J, Xu S. Theoretical insight into the structural mechanism for the binding of vinblastine with tubulin. J Biomol Struct Dyn 2015; 33:2234-54. [PMID: 25588192 DOI: 10.1080/07391102.2014.999256] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Vinblastine (VLB) is one of vinca alkaloids with high cytotoxicity toward cancer cells approved for clinical use. However, because of drug resistance, toxicity, and other side effects caused from the use of VLB, new vinca alkaloids with higher cytotoxicity toward cancer cells and other good qualities need to develop. One strategy is to further study and better understand the essence why VLB possesses the high cytotoxicity toward cancer cells. In present work, by using molecular simulation, molecular docking, density functional calculation, and the crystal structure of α,β-tubulin complex, we find two modes labeled in catharanthine moiety (CM) and vindoline moiety (VM) modes of VLB bound with the interface of α,β-tubulin to probe the essence why VLB has the high cytotoxicity toward cancer cells. In the CM mode, nine key residues B-Ser178, B-Asp179, B-Glu183, B-Tyr210, B-Asp226, C-Lys326, C-Asp327, C-Lys336, and C-Lys352 from the α,β-tubulin complex are determined as the active sites for the interaction of VLB with α,β-tubulin. Some of them such as B-Ser178, B-Glu183, B-Tyr210, B-Asp226, C-Lys326, C-Asp327, and C-Lys336 are newly identified as the active sites in present work. The affinity between VLB and the active pocket within the interface of α,β-tubulin is -60.8 kJ mol(-1) in the CM mode. In the VM mode, that is a new mode established in present paper, nine similar key residues B-Lys176, B-Ser178, B-Asp179, B-Glu183, B-Tyr210, B-Asp226, C-Lys326, C-Asp327, and C-Lys336 from the α,β-tubulin complex are found as the active sites for the interaction with VLB. The difference is from one key residue C-Lys352 in the CM mode changed to the key residue B-Lys176 in the VM mode. The affinity between VLB and the active pocket within the interface of α,β-tubulin is -96.3 kJ mol(-1) in the VM mode. Based on the results obtained in present work, and because VLB looks like two faces, composed of CM and VM both to have similar polar active groups, to interact with the active sites, we suggest double-faces sticking mechanism for the binding of VLB to the interface of α,β-tubulin. The double-faces sticking mechanism can be used to qualitatively explain high cytotoxicity toward cancer cells of vinca alkaloids including vinblastine, vincristine, vindestine, and vinorelbine approved for clinical use and vinflunine still in a phase III clinical trial. Furthermore, this mechanism will be applied to develop novel vinca alkaloids with much higher cytotoxicity toward cancer cells.
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Affiliation(s)
- Shaoming Chi
- a Key Laboratory of Education Ministry for Medicinal Chemistry of Natural Resource , College of Chemical Science and Technology, Yunnan University , Kunming 650091 , China
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15
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Wang XM, Fan RQ, Wang P, Qiang LS, Yang YL, Wang YL. Auxiliary ligand-assisted two novel one-dimensional indium coordination polymers: Synthesis, crystal structures and photoluminescence characterization effected by solvent and temperature. INORG CHEM COMMUN 2015. [DOI: 10.1016/j.inoche.2014.11.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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16
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Kwon MS, Jang G, Bilby D, Milián-Medina B, Gierschner J, Lee TS, Kim J. Design principles of chemiluminescence (CL) chemodosimeter for self-signaling detection: luminol protective approach. RSC Adv 2014. [DOI: 10.1039/c4ra08182j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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17
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Chen S, Fan R, Wang X, Yang Y. A novel blue-emitting indium(III) complex: Synthesis, crystal structure, and effect of solvents and temperature on the luminescent properties. INORG CHEM COMMUN 2014. [DOI: 10.1016/j.inoche.2014.03.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Gao S, Fan RQ, Qiang LS, Wang P, Chen S, Wang XM, Yang YL. Effects of solvents and temperature on the luminescence properties of Cd-isonicotinic acid frameworks based on mono-, bi-, and trinuclear cluster units. CrystEngComm 2014. [DOI: 10.1039/c3ce42216j] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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19
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Vijaya Pandiyan B, Deepa P, Kolandaivel P. On the nature of non-covalent interactions in isomers of 2,5-dichloro-1,4-benzoquinone dimers – ground- and excited-state properties. Phys Chem Chem Phys 2014; 16:19928-40. [DOI: 10.1039/c4cp02484b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Impact of intermolecular NCIs (C–H⋯O, C–H⋯Cl, C–Cl⋯O, C–Cl⋯Cl–C, C–O⋯C, C–Cl⋯C and C–O⋯π) on chirality arrangement in the isomers of the 2,5-dichloro-1,4-benzoquinone (DCBQ) dimer.
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Affiliation(s)
| | - P. Deepa
- Department of Computational Chemistry
- Institute of Organic Chemistry and Biochemistry of the Academy of Sciences of the Czech Republic
- 166 10 Prague 6, Czech Republic
| | - P. Kolandaivel
- Department of Physics
- Bharathiar University
- Coimbatore, India
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21
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Wang XM, Qiang LS, Fan RQ, Wang P, Yang YL. A blue-green-emitting 3D supramolecular compound: synthesis, crystal structure and effect of solvents and temperature on the luminescent properties. Supramol Chem 2013. [DOI: 10.1080/10610278.2013.792340] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Xin-Ming Wang
- a Department of Chemistry , Harbin Institute of Technology , Harbin , 150001 , P.R. China
| | - Liang-Sheng Qiang
- a Department of Chemistry , Harbin Institute of Technology , Harbin , 150001 , P.R. China
| | - Rui-Qing Fan
- a Department of Chemistry , Harbin Institute of Technology , Harbin , 150001 , P.R. China
| | - Ping Wang
- a Department of Chemistry , Harbin Institute of Technology , Harbin , 150001 , P.R. China
| | - Yu-Lin Yang
- a Department of Chemistry , Harbin Institute of Technology , Harbin , 150001 , P.R. China
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Moyon NS, Gashnga PM, Phukan S, Mitra S. Specific solvent effect on lumazine photophysics: A combined fluorescence and intrinsic reaction coordinate analysis. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.05.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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Fluorescence modulation and associative behavior of lumazine in hydrophobic domain of micelles and bovine serum albumin. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2013; 121:37-45. [DOI: 10.1016/j.jphotobiol.2013.02.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Revised: 02/13/2013] [Accepted: 02/13/2013] [Indexed: 11/21/2022]
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24
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On the Fluorescence of Luminol in a Silver Nanoparticles Complex. J Fluoresc 2013; 23:569-74. [DOI: 10.1007/s10895-013-1204-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Accepted: 02/24/2013] [Indexed: 10/27/2022]
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25
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Singla N, Chowdhury P. Role of hydrogen bonding in excited state intramolecular proton transfer of Indole-7-Carboxaldehyde: A theoretical and experimental study. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.08.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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26
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Phukan S, Mitra S. Fluorescence behavior of ethidium bromide in homogeneous solvents and in presence of bile acid hosts. J Photochem Photobiol A Chem 2012. [DOI: 10.1016/j.jphotochem.2012.06.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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27
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Investigation of contrasting hydrogen bonding pattern of 3-(phenylamino)-cyclohexen-1-one with solvents in the ground and excited states. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2012.01.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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28
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Sancho MI, Almandoz MC, Blanco SE, Castro EA. Spectroscopic study of solvent effects on the electronic absorption spectra of flavone and 7-hydroxyflavone in neat and binary solvent mixtures. Int J Mol Sci 2011; 12:8895-912. [PMID: 22272110 PMCID: PMC3257107 DOI: 10.3390/ijms12128895] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Revised: 11/05/2011] [Accepted: 11/14/2011] [Indexed: 11/17/2022] Open
Abstract
The solvatochromic characteristics of flavone and 7-hydroxyflavone were investigated in neat and binary solvent mixtures. The spectral shifts of these solutes were correlated with the Kamlet and Taft parameters (α, β and π*) using linear solvation energy relationships. The multiparametric analysis indicates that both specific hydrogen bond donor ability and non-specific dipolar interactions of the solvents play an important role in absorption maxima of flavone in pure solvents. The hydrogen bond acceptor ability of the solvent was the main parameter affecting the absorption maxima of 7-hydroxyflavone. The simulated absorption spectra using a TD-DFT method were in good agreement with the experimental ones for both flavones. Index of preferential solvation was calculated as a function of solvent composition. Preferential solvation by ethanol was detected in cyclohexane-ethanol and acetonitrile-ethanol mixtures for flavone and in acetonitrile-ethanol mixtures for 7-hydroxyflavone. These results indicate that intermolecular hydrogen bonds between solute and solvent are responsible for the non-linear variation of the solvatochromic shifts on the mole fraction of ethanol in the analyzed binary mixtures.
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Affiliation(s)
- Matias I. Sancho
- Physical Chemistry Laboratory, Faculty of Chemistry, Biochemistry and Pharmacy, San Luis National University, 5700 San Luis, Argentina; E-Mails: (M.I.S.); (M.C.A.); (S.E.B.)
- Multidisciplinary Institute of Biological Investigations (IMIBIO-SL) CONICET, 5700 San Luis, Argentina
| | - Maria C. Almandoz
- Physical Chemistry Laboratory, Faculty of Chemistry, Biochemistry and Pharmacy, San Luis National University, 5700 San Luis, Argentina; E-Mails: (M.I.S.); (M.C.A.); (S.E.B.)
| | - Sonia E. Blanco
- Physical Chemistry Laboratory, Faculty of Chemistry, Biochemistry and Pharmacy, San Luis National University, 5700 San Luis, Argentina; E-Mails: (M.I.S.); (M.C.A.); (S.E.B.)
- Multidisciplinary Institute of Biological Investigations (IMIBIO-SL) CONICET, 5700 San Luis, Argentina
| | - Eduardo A. Castro
- INIFTA, Chemistry Department, Faculty of Exact Sciences, La Plata National University, 1900 Buenos Aires, Argentina
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Al-Ahmary KM, Habeeb MM, Al-Solmy EA. Spectroscopic studies of the hydrogen bonded charge transfer complex of 2-aminopyridine with π-acceptor chloranilic acid in different polar solvents. J Mol Liq 2011. [DOI: 10.1016/j.molliq.2011.06.015] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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Moyon NS, Mitra S. Luminol Fluorescence Quenching in Biomimicking Environments: Sequestration of Fluorophore in Hydrophobic Domain. J Phys Chem B 2011; 115:10163-72. [DOI: 10.1021/jp204424w] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Sivaprasad Mitra
- Department of Chemistry, North-Eastern Hill University, Shillong 793 022, India
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Moyon NS, Mitra S. Fluorescence solvatochromism in lumichrome and excited-state tautomerization: a combined experimental and DFT study. J Phys Chem A 2011; 115:2456-64. [PMID: 21388154 DOI: 10.1021/jp1102687] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fluorescence solvatochromism of lumichrome (LC) was studied by steady-state and time-resolved fluorescence spectroscopy. The excited-state properties of LC do not show any correlation with solvent polarity, however, reasonably good correlation with solvent E(T)(30) parameter was observed. A quantitative estimation of contribution from different solvatochromic parameters, like solvent polarizability (π*), hydrogen bond donor (α), and hydrogen bond acceptor (β) ability of the solvent, was made using linear free energy relationship on the basis of Kamlet-Taft equation. The analysis reveals that hydrogen bond donating ability (acidity) of the solvent is the most important parameter that characterizes the excited-state behavior of lumichrome. Quantum mechanical calculations using density functional theory (DFT) were done to study the most stable structure and excited-state tautomerization process of LC toward the formation of isoalloxazines. Charge localization in the excited state and formation of hydrogen-bonded cluster through solvent hydrogen bond donation on the N10 atom of alloxazine moiety were predicted to be the key step toward this water-catalyzed tautomerization process.
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Al-Ahmary KM, Habeeb MM, Al-Solmy EA. Spectroscopic investigation on proton transfer reaction in the complex of 2-aminopyridine with 2, 6-dichloro-4-nitrophenol in different solvents. J Mol Liq 2011. [DOI: 10.1016/j.molliq.2010.11.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Lee HS, Kim HJ, Kang JG. Luminescence properties of 4-hydroxy-5-phenylpyrido[3,2,1-jk]carbazol-6-one: solvatochromism and sensitivity to amine solution. Photochem Photobiol Sci 2011; 10:1338-45. [DOI: 10.1039/c1pp05045a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Hyo-Sung Lee
- Department of Chemistry, Chungnam National University, Daejeon, 305-764, Republic of Korea
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Moyon NS, Mitra S. On the interaction of luminol with human serum albumin: Nature and thermodynamics of ligand binding. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.08.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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