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Shishkanova TV, Pospíšilová E, Trchová M, Broncová G. Zwitterionic oligomers of 3-aminobenzoic acid on screen-printed electrodes: structure, properties and forensic application. Analyst 2024; 149:1121-1131. [PMID: 38205618 DOI: 10.1039/d3an01700a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2024]
Abstract
The popularity and rapid spread of new psychoactive substances is why there is an urgent need for their fast monitoring in saliva in the field with electrodes modified with a selective receptor. Oligomers of electrochemically oxidized 3-aminobenzoic acid that are deposited on the surface of a graphite screen-printed electrode (o-3ABA/G/SPE) is proposed as a selector for the analyte of forensic interest. The oligomeric structure and existence of the zwitterionic form of o-3ABA on the G/SPE surface was confirmed using scanning electron microscopy, Raman spectroscopy and cyclic voltammetry techniques. The equilibrium adsorption constants between o-3ABA and 2-aminoindane (primary amine: Kads(2-AI) = 5.31 × 104) and selected synthetic cathinones (secondary amine: Kads(butylone) = 6.12 × 105, tertiary amines: Kads(MDPV) = 3.41 × 104 and Kads(naphyrone) = 1.01 × 104) were estimated using the electrochemical impedance spectroscopy (EIS) technique. The EIS technique was applied for determining a 1.0 μM concentration of 2-AI (RSD 3.5-4.0%) and butylone (RSD 4.9-6.4%) in the model and oral fluid samples.
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Affiliation(s)
- Tatiana V Shishkanova
- Department of Analytical Chemistry, University of Chemistry and Technology Prague, Technická 5, 16628 Prague 6, Czech Republic. eva.pospisilovavscht.cz
| | - Eva Pospíšilová
- Department of Analytical Chemistry, University of Chemistry and Technology Prague, Technická 5, 16628 Prague 6, Czech Republic. eva.pospisilovavscht.cz
| | - Miroslava Trchová
- Central Laboratory, University of Chemistry and Technology Prague, Technická 5, 16628 Prague 6, Czech Republic
| | - Gabriela Broncová
- Department of Analytical Chemistry, University of Chemistry and Technology Prague, Technická 5, 16628 Prague 6, Czech Republic. eva.pospisilovavscht.cz
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2
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Spectral characteristics of 3, 5-diaminobenzoic acid in pure and mixed solvents: Experimental and theoretical study. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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3
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Complexation of Cyclodextrins with Benzoic Acid in Water-Organic Solvents: A Solvation-Thermodynamic Approach. Molecules 2021; 26:molecules26154408. [PMID: 34361559 PMCID: PMC8348358 DOI: 10.3390/molecules26154408] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 07/08/2021] [Accepted: 07/13/2021] [Indexed: 11/29/2022] Open
Abstract
The aim of this research is to obtain new data about the complexation between β-cyclodextrin (β-CD) and benzoic acid (BA) as a model reaction of the complex formation of hydrophobic molecules with cyclodextrins (CDs) in various media. This research may help developing cyclodextrin-based pharmaceutical formulations through the choice of the appropriate solvent mixture that may be employed in the industrial application aiming to control the reactions/processes in liquid phase. In this paper, NMR results for the molecular complex formation between BA and β-CD ([BA⊂β-CD]) in D2O-DMSO-d6 and in D2O-EtOH have shown that the stability of the complex in the H2O-DMSO-d6 varies within the experimental error, while decreases in H2O-EtOH. Changes in the Gibbs energy of BA resolvation in water and water–dimethylsulfoxide mixtures have been obtained and have been used in the analysis of the reagent solvation contributions into the Gibbs energy changes of the [BA⊂β-CD] molecular complex formation. Quantum chemical calculations of the interaction energy between β-CD and BA as well as the structure of the [BA⊂β-CD] complex and the energy of β-CD and BA interaction in vacuum and in the medium of water, methanol and dimethylsulfoxide solvents are carried out. The stability of [BA⊂β-CD] complex in H2O-EtOH and H2O-DMSO solvents, obtained by different methods, are compared. The thermodynamic parameters of the [BA⊂β-CD] molecular complexation as well as the reagent solvation contributions in H2O-EtOH and H2O-DMSO mixtures were analyzed by the solvation-thermodynamic approach.
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4
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Spectroscopic and DFT evaluation of the positional effect of amino group on the properties of aminobenzenesulphonic acid: solvents interactions. CHEMICAL PAPERS 2021. [DOI: 10.1007/s11696-020-01497-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Husain S, Mehata MS, Pandey N, Mishra H, Pant S. Reinvestigation of the photophysics of 3-aminobenzoic acid in neat and mixed binary solvents. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 247:119100. [PMID: 33212332 DOI: 10.1016/j.saa.2020.119100] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 10/10/2020] [Accepted: 10/13/2020] [Indexed: 06/11/2023]
Abstract
The present study elucidates the reinvestigation of the photophysical behavior of 3-aminobenzoic acid (3ABA) in solvents of different polarities using the steady-state spectroscopic techniques. Kamlet-Taft and Catalan solvatochromic models have been used to analyze the solvatochromic changes in neat solvents. The hydrogen bond donating ability of the solvent was found to be the main parameter affecting the spectral behavior of 3ABA. The solvatochromic characteristics of 3ABA have also been examined in binary solvent mixtures viz. acetonitrile (ACN)-methanol (MeOH) and benzene (BEN)-MeOH using the concept of preferential solvation. The preferential solvation of 3ABA shows unusual behavior for BEN-MeOH binary mixture and described unnoticed sigmoidal behavior in the ground state and synergistic impact in the excited state. Besides, the 3ABA was studied theoretically by quantum chemical calculations using (HF) Hartree-Fock and (DFT/B3LYP) density functional theories and its electronic absorption bands have been assigned by time-dependent density functional theory (TD-DFT). The effect of solvents on 3ABA was considered using a IEF-PCM-TDDFT (integral equation formalism of the polarizable continuum model- TDDFT) method. Thus, the theoretical results were found to be closer to the experimental results.
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Affiliation(s)
- Shahid Husain
- Photophysics Laboratory, Department of Physics, Centre of Advanced Study, DSB Campus, Kumaun University, Nainital 263002, India
| | - Mohan Singh Mehata
- Laser Spectroscopy Laboratory, Department of Applied Physics, Delhi Technological University, Bawana Road, Delhi 110042, India.
| | - Nupur Pandey
- Photophysics Laboratory, Department of Physics, Centre of Advanced Study, DSB Campus, Kumaun University, Nainital 263002, India
| | - Hirdyesh Mishra
- Physics Section, M.M.V., Banaras Hindu University (B.H.U.), Varanasi 221005, India
| | - Sanjay Pant
- Photophysics Laboratory, Department of Physics, Centre of Advanced Study, DSB Campus, Kumaun University, Nainital 263002, India
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6
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Fuchi Y, Umeno T, Abe Y, Ikeno K, Yamasaki R, Okamoto I, Usui K, Karasawa S. Characterization of Push-Pull-Type Benzo[X]quinoline Derivatives (X = g or f): Environmentally Responsive Fluorescent Dyes with Multiple Functions. J Org Chem 2020; 85:13177-13190. [PMID: 32940474 DOI: 10.1021/acs.joc.0c01878] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Benzo[X]quinoline (X = g or f: BQX) derivatives bearing bis-trifluoromethyl and amine groups have been designed as push-pull-type fluorescent dyes. Through the synthesis of BQX derivatives from 2,7-diaminonaphthalene, linear-type (BQL) and angular-type (BQA) structural isomers were obtained. X-ray structures of single crystals from six given BQX derivatives revealed that the BQL and BQA series adopt planar- and bowl-shaped structures. In the fluorescence spectra, interestingly, the BQL series emitted in the near-infrared region over 700 nm in polar solvents. Based on the visible absorptions and base properties related to the amine moiety, the ammonia responsiveness was investigated using an ion-exchange reaction by the BQX-HCl salt. By exploiting the environmentally responsive fluorescence probe, cell imaging through confocal laser microscopy was conducted using HeLa and 3T3-L1 cells, emitting specific lipid droplets. The results indicate that BQX derivatives have multiple functions and may be applied in materials chemistry and biochemistry.
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Affiliation(s)
- Yasufumi Fuchi
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3-3165 Higashi-tamagawagakuen, Machida 194-8543, Japan
| | - Tomohiro Umeno
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3-3165 Higashi-tamagawagakuen, Machida 194-8543, Japan
| | - Yuichiro Abe
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-Ku, Fukuoka 812-8582, Japan
| | - Keita Ikeno
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3-3165 Higashi-tamagawagakuen, Machida 194-8543, Japan
| | - Ryu Yamasaki
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3-3165 Higashi-tamagawagakuen, Machida 194-8543, Japan
| | - Iwao Okamoto
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3-3165 Higashi-tamagawagakuen, Machida 194-8543, Japan
| | - Kazuteru Usui
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3-3165 Higashi-tamagawagakuen, Machida 194-8543, Japan
| | - Satoru Karasawa
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3-3165 Higashi-tamagawagakuen, Machida 194-8543, Japan
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Wei Z, Liu H, Yu L, Xiao S, Hou Y, Chen X. Delocalized aromatic molecules with matched electron‐donating and electron‐withdrawing groups enhancing insulating performance of polyethylene blends. J Appl Polym Sci 2020. [DOI: 10.1002/app.49185] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Zuojun Wei
- Key Laboratory of Biomass Chemical Engineering of the Ministry of EducationCollege of Chemical and Biological Engineering, Zhejiang University Hangzhou China
- Institute of Zhejiang University‐Quzhou Quzhou China
| | - Haiyan Liu
- Key Laboratory of Biomass Chemical Engineering of the Ministry of EducationCollege of Chemical and Biological Engineering, Zhejiang University Hangzhou China
- Institute of Zhejiang University‐Quzhou Quzhou China
| | - Linwei Yu
- Zhejiang Provincial Key Laboratory of Electrical Machine SystemsCollege of Electrical Engineering, Zhejiang University Hangzhou China
| | - Shuwen Xiao
- Key Laboratory of Biomass Chemical Engineering of the Ministry of EducationCollege of Chemical and Biological Engineering, Zhejiang University Hangzhou China
- Institute of Zhejiang University‐Quzhou Quzhou China
| | - Yaxin Hou
- Key Laboratory of Biomass Chemical Engineering of the Ministry of EducationCollege of Chemical and Biological Engineering, Zhejiang University Hangzhou China
- Institute of Zhejiang University‐Quzhou Quzhou China
| | - Xiangrong Chen
- Zhejiang Provincial Key Laboratory of Electrical Machine SystemsCollege of Electrical Engineering, Zhejiang University Hangzhou China
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8
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Singh MP, Tarai A, Baruah JB. Neutral, Zwitterion, Ionic Forms of 5‐Aminoisophthalic Acid in Cocrystals, Salts and Their Optical Properties. ChemistrySelect 2019. [DOI: 10.1002/slct.201901111] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Munendra Pal Singh
- Department of ChemistryIndian Institute of Technology Guwahati, Guwahati - 781 039 Assam India
| | - Arup Tarai
- Department of ChemistryIndian Institute of Technology Guwahati, Guwahati - 781 039 Assam India
| | - Jubaraj Bikash Baruah
- Department of ChemistryIndian Institute of Technology Guwahati, Guwahati - 781 039 Assam India
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9
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Synthesis and properties of microenvironment-sensitive oligonucleotides containing a small fluorophore, 3-aminobenzonitrile or 3-aminobenzoic acid. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.10.062] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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10
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3D-Supramolecular Coordination Polymer Nanoparticles Based on Cd(II) and Mixed Ligands: Single Crystal X-Ray Structure, Luminescence and Photocatalytic Properties. J Inorg Organomet Polym Mater 2017. [DOI: 10.1007/s10904-017-0755-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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11
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Terekhova I, Kumeev R, Alper G, Chakraborty S, Pérez-Sánchez H, Núñez-Delicado E. Molecular recognition of aromatic carboxylic acids by hydroxypropyl-γ-cyclodextrin: experimental and theoretical evidence. RSC Adv 2016. [DOI: 10.1039/c6ra06340c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Inclusion complex formation of hydroxypropyl-γ-cyclodextrin with benzoic, nicotinic and isomeric aminobenzoic acids in water was studied by calorimetry, 1H NMR, densimetry and molecular modeling.
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Affiliation(s)
- Irina Terekhova
- G. A. Krestov Institute of Solution Chemistry of Russian Academy of Sciences
- 153045 Ivanovo
- Russia
| | - Roman Kumeev
- G. A. Krestov Institute of Solution Chemistry of Russian Academy of Sciences
- 153045 Ivanovo
- Russia
| | - Gennady Alper
- G. A. Krestov Institute of Solution Chemistry of Russian Academy of Sciences
- 153045 Ivanovo
- Russia
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12
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Tsaryuk V, Vologzhanina A, Zhuravlev K, Kudryashova V, Szostak R, Zolin V. Structures and manifestation of ortho-, meta-, and para-NH2-substitution in the optical spectra of europium and terbium aminobenzoates. J Photochem Photobiol A Chem 2014. [DOI: 10.1016/j.jphotochem.2014.04.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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13
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Paramasivaganesh K, Srinivasan K, Manivel A, Anandan S, Sivakumar K, Radhakrishnan S, Stalin T. Studies on inclusion complexation between 4,4′-dihydroxybiphenyl and β-cyclodextrin by experimental and theoretical approach. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2013.04.072] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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14
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α-Cyclodextrin/aminobenzoic acid binding in salt solutions at different pH: Dependence on guest structure. Int J Biol Macromol 2013; 57:255-8. [DOI: 10.1016/j.ijbiomac.2013.03.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 02/11/2013] [Accepted: 03/09/2013] [Indexed: 11/19/2022]
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15
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Antony Muthu Prabhu A, Subramanian VK, Rajendiran N. Excimer formation in inclusion complexes of β-cyclodextrin with salbutamol, sotalol and atenolol: spectral and molecular modeling studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 96:95-107. [PMID: 22659277 DOI: 10.1016/j.saa.2012.04.044] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Revised: 03/20/2012] [Accepted: 04/07/2012] [Indexed: 06/01/2023]
Abstract
The inclusion complexation behavior of salbutamol, sotalol and atenolol drugs with β-cyclodextrin (β-CD) were investigated by UV-visible, fluorometry, time resolved fluorescence, FT-IR, (1)H NMR, SEM and PM3 methods. The above drugs gave a single emission maximum in water where as dual emission in β-CD. In β-CD solutions the shorter wavelength fluorescence intensity was regularly decreased and longer wavelength fluorescence intensity increased. Addition of β-CD to aqueous solutions of drugs resulted into excimer emission. The excimer emission is concluded to be due to a 1:2 inclusion complex between β-CD and drug. Nanosecond time-resolved studies indicated that all drugs exhibited biexponential decay in solvents and triexponential decay in CD. Investigations of thermodynamic and electronic properties confirmed the stability of the inclusion complex.
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Affiliation(s)
- A Antony Muthu Prabhu
- Department of Chemistry, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu, India
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16
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Prabhu AAM, Sankaranarayanan RK, Venkatesh G, Rajendiran N. Dual Fluorescence of Fast Blue RR and Fast Violet B: Effects of Solvents and Cyclodextrin Complexation. J Phys Chem B 2012; 116:9061-74. [DOI: 10.1021/jp302162g] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- A. Antony Muthu Prabhu
- Department of Chemistry, Annamalai University, Annamalai Nagar, 608 002 Tamilnadu,
India
| | - R. K. Sankaranarayanan
- Department of Chemistry, Annamalai University, Annamalai Nagar, 608 002 Tamilnadu,
India
| | - G. Venkatesh
- Department of Chemistry, Annamalai University, Annamalai Nagar, 608 002 Tamilnadu,
India
| | - N. Rajendiran
- Department of Chemistry, Annamalai University, Annamalai Nagar, 608 002 Tamilnadu,
India
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Elasaad K, Norberg B, Wouters J. Crystallographic, UV spectroscopic and computational studies of the inclusion complex of α-cyclodextrin with p-aminobenzoic acid. Supramol Chem 2012. [DOI: 10.1080/10610278.2012.658392] [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: 10/28/2022]
Affiliation(s)
- Kossay Elasaad
- a Department of Chemistry , University of Namur , rue de Bruxelles, 61, B-5000 , Namur , Belgium
- b Ministry of Higher Education in Syrian Arab Republic , 9251, Mezzeh Gamarik Square, Damascus , Syria
| | - Bernadette Norberg
- a Department of Chemistry , University of Namur , rue de Bruxelles, 61, B-5000 , Namur , Belgium
| | - Johan Wouters
- a Department of Chemistry , University of Namur , rue de Bruxelles, 61, B-5000 , Namur , Belgium
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18
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Gao F, Ye X, Li H, Zhong X, Wang Q. Evidence for Two-Photon Absorption-Induced ESIPT of Chromophores Containing Hydroxyl and Imino Groups. Chemphyschem 2012; 13:1313-24. [DOI: 10.1002/cphc.201100885] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2011] [Indexed: 11/09/2022]
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19
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Sustained-release of flutamide from radiation-crosslinked poly(4-acryloyl morpholine-acrylic acid) hydrogels. Macromol Res 2012. [DOI: 10.1007/s13233-012-0037-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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20
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Yang PJ, Chu HC, Chen TC, Lin HC. Recoverable fluorescence chemosensors for Ni2+ ions based on hydrogen-bonded side-chain copolymers presenting pendent benzoic acid and pyridyl receptor units. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31367g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Nakajima H, Yasuda M, Shimizu K, Toyoshima N, Tsukahara Y, Kobayashi T, Nakamura S, Chiba K, Baba A. Stabilization of Excited State Using Through-Space Interaction between Independent π-Systems Mediated by aperi-Substituted Hydroxy Group in 1-Arylnaphthalenes: Unexpected Blue Emission of 1,3,5-Tris(peri-hydroxynaphthyl)benzene. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2011. [DOI: 10.1246/bcsj.20110139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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22
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Bakkialakshmi S, Menaka T. A study of the interaction between rhodamine 6g and hydroxy propyl β-cyclodextrin by steady state fluorescence. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 81:8-13. [PMID: 21724451 DOI: 10.1016/j.saa.2011.04.082] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Revised: 03/18/2011] [Accepted: 04/29/2011] [Indexed: 05/31/2023]
Abstract
The binding of rhodamine 6G and hydroxy propyl β-cyclodextrin (Hβ-CD) was investigated measuring fluorescence and absorption at pH 7.0. The solid inclusion complex of Rh6G and Hβ-CD has been studied by Ultraviolet (UV) spectroscopy, Fluorimetry, Fourier Transform Infrared (FTIR), (1)H Nuclear Magnetic Resonance ((1)HNMR) and in the Scanning Electron Microscope (SEM). Association constant K(g) and K(e) were determined by the enhancement of the fluorescence of rhodamine 6G in the presence of Hβ-CD. Fluorescence of Rh6G is generally enhanced, in complexes of Rh6G and β-Cyclodextrin in aqueous solutions. The free energy change for the ground state (ΔG(g)) and for the excited state (ΔG(e)) have also been determined. The experimental results indicated that the inclusion process is an exothermic and spontaneous.
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Affiliation(s)
- S Bakkialakshmi
- Department of Physics, Annamalai University, Annamalainagar-608 002, TamilNadu, India.
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23
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Srinivasan K, Kayalvizhi K, Sivakumar K, Stalin T. Study of inclusion complex of β-cyclodextrin and diphenylamine: photophysical and electrochemical behaviors. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:169-178. [PMID: 21459035 DOI: 10.1016/j.saa.2011.02.030] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2010] [Revised: 02/06/2011] [Accepted: 02/16/2011] [Indexed: 05/30/2023]
Abstract
The photophysical, electrochemical and photoprototropic behaviors of diphenylamine (DPA) in aqueous β-cyclodextrin (β-CD) solution have been investigated using absorption spectroscopy and cyclic voltammetric techniques. Absorption of the neutral and cationic form of DPA is enhanced due to the formation of a 1:1 complex with β-CD. The formation of this complex has been confirmed by Benesi-Hildebrand plot and docking studies by RasMol tool methods. The solid complex of β-CD with DPA is investigated by FT-IR, XRD and AFM methods. The thermodynamic parameters (ΔG, ΔH and ΔS) of inclusion process are also determined. The pK(a) values of neutral-monocation equilibria have been determined with absorption (conjugate acid-base) titrations. A mechanism is proposed to explain the inclusion process.
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Affiliation(s)
- K Srinivasan
- Department of Industrial Chemistry, Alagappa University, Karaikudi, Tamilnadu, India
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Fleisher AJ, Morgan PJ, Pratt DW. High-resolution electronic spectroscopy studies of meta-aminobenzoic acid in the gas phase reveal the origins of its solvatochromic behavior. Chemphyschem 2011; 12:1808-15. [PMID: 21557435 DOI: 10.1002/cphc.201100038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2011] [Indexed: 11/10/2022]
Abstract
A theoretical and experimental investigation of meta-aminobenzoic acid (MABA) in the gas phase is presented, with the goal of understanding counterintuitive observations on the solvatochromism of this "push-pull" molecule. The adiabatic excitation energies, transition moments, and excited-state structures are examined using the complete active space self-consistent field approach (CASSCF and CASPT2), which shows the first excited electronic state of MABA to be of greater charge transfer character than was found in the para-isomer (PABA). The rotationally resolved electronic spectrum of MABA reveals the existence of two rotamers, owing to asymmetry in the carboxylic acid functional group. Stark measurements in a molecular beam show the change in permanent dipole moment upon excitation to be Δμ≈3.5 D for both rotamers, more than three times larger than that found in PABA. The excited state measurements reported here, along with supporting data from theory, clearly demonstrate how the meta-directing effects of asymmetric substitution in aniline derivatives can drive charge transfer pathways in the isolated molecule.
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Affiliation(s)
- Adam J Fleisher
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15217, USA
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Azonium-Ammonium Tautomerism and Inclusion Complexation of 1-(2,4-diamino phenylazo) Naphthalene and 4-aminoazobenzene. J Fluoresc 2011; 21:1485-97. [DOI: 10.1007/s10895-011-0835-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2010] [Accepted: 01/10/2011] [Indexed: 10/18/2022]
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26
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Srinivasan K, Vaheethabanu J, Manisankar P, Stalin T. Study of inclusion complex of β-cyclodextrin and Ortho-Anisidine; photophysical and electrochemical behaviors. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2010.12.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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27
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Effect of Solvents and pH on β-Cyclodextrin Inclusion Complexation of 2,4-Dihydroxyazobenzene and 4-Hydroxyazobenzene. J SOLUTION CHEM 2011. [DOI: 10.1007/s10953-010-9639-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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28
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Antony Muthu Prabhu A, Sankaranarayanan RK, Siva S, Subramanian VK, Rajendiran N. Spectral characteristics of 2-amino-3-benzyloxy pyridine: Effects of solvents, pH, and β-cyclodextrin. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2010. [DOI: 10.1134/s0036024410130121] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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30
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Paul BK, Samanta A, Kar S, Guchhait N. Lactim–lactam tautomerism is favoured over enol–keto tautomerism in 2-hydroxy-5-(4-fluorophenyl)nicotinic acid: Experimental and quantum chemical approach. J Photochem Photobiol A Chem 2010. [DOI: 10.1016/j.jphotochem.2010.06.028] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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31
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32
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Laser-induced fluorescence and dispersed fluorescence studies of the donor–acceptor system 4-amino 3-methyl benzoic acid methyl ester and its solvated clusters: Evidence of excited-state charge-transfer reaction. J Photochem Photobiol A Chem 2010. [DOI: 10.1016/j.jphotochem.2010.05.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Intramolecular Charge Transfer Effects on Flutamide Drug. J Fluoresc 2010; 20:809-20. [DOI: 10.1007/s10895-010-0623-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2009] [Accepted: 02/08/2010] [Indexed: 10/19/2022]
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34
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Roik NV, Belyakova LA. Influence of β-cyclodextrin on the protolytic and complexing ability of p-aminobenzoic acid. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2010. [DOI: 10.1134/s0036024410030143] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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35
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Iglesias-García I, Brandariz I, Iglesias E. Fluorescence study of tetracaine–cyclodextrin inclusion complexes. Supramol Chem 2010. [DOI: 10.1080/10610270903304400] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Iván Iglesias-García
- a Departamento de Química Física e E. Q. I. Facultad de Ciencias , Universidad de La Coruña , La Corunña, Spain
| | - Isabel Brandariz
- a Departamento de Química Física e E. Q. I. Facultad de Ciencias , Universidad de La Coruña , La Corunña, Spain
| | - Emilia Iglesias
- a Departamento de Química Física e E. Q. I. Facultad de Ciencias , Universidad de La Coruña , La Corunña, Spain
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36
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Sankaranarayanan RK, Siva S, Antony Muthu Prabhu A, Rajendiran N. A study on the inclusion complexation of 3,4,5-trihydroxybenzoic acid with β-cyclodextrin at different pH. J INCL PHENOM MACRO 2010. [DOI: 10.1007/s10847-009-9729-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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37
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Ghosh S, Chakraborty A, Kar S, Guchhait N. Photoinduced properties of methyl ester of 2,6-dimethyl-1-amino-4-benzoic acid: evidence of charge transfer emission from a weak primary amino donor. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 75:320-324. [PMID: 19942474 DOI: 10.1016/j.saa.2009.10.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2009] [Revised: 10/12/2009] [Accepted: 10/26/2009] [Indexed: 05/28/2023]
Abstract
Photophysical properties of methyl ester of 2,6-dimethyl-1-amino-4-benzoic acid (M26DMB) have been investigated using steady state absorption and emission spectroscopy and time-resolved emission spectroscopy. Interestingly, not only in polar solvents, the molecule M26DMB having a weak primary amino donor group shows broad red-shifted emission band even in non-polar environment which in all probability arises from closely spaced local and charge transfer (CT) states. Clear dual fluorescence in polar protic solvents comprises of less intense local emission band and strong red-shifted CT band. The position of the red-shifted emission band is dependent on both the polarity and the hydrogen-bonding ability of the solvent.
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Affiliation(s)
- Shalini Ghosh
- Department of Chemistry, University of Calcutta, Kolkata, India
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38
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Singh RB, Mahanta S, Guchhait N. Spectral modulation of charge transfer fluorescence probe encapsulated inside aqueous and non-aqueous β-cyclodextrin nanocavities. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2009.10.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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39
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Anton Smith A, Manavalan R, Kannan K, Rajendiran N. Spectral characteristics of tramadol in different solvents and beta-cyclodextrin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 74:469-477. [PMID: 19665424 DOI: 10.1016/j.saa.2009.06.047] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2008] [Revised: 06/18/2009] [Accepted: 06/23/2009] [Indexed: 05/28/2023]
Abstract
Effect of solvents and beta-cyclodextrin on the absorption and fluorescence spectra of tramadol drug has been investigated and compared with anisole. The solid inclusion complex of tramadol with beta-CD is investigated by FT-IR, (1)H NMR, scanning electron microscope (SEM), DSC and semiempirical methods. The thermodynamic parameter (DeltaG) of inclusion process is determined. A solvent study shows (i) the spectral behaviour of both tramadol and anisole molecules is similar to each other and (ii) the cyclohexanol group in tramadol is not effectively conjugated with anisole group. However, in beta-CD, due to space restriction of the CD cavity, a weak interaction is present between the above groups in tramadol. beta-Cyclodextrin studies show that tramadol forms 1:2 inclusion complex with beta-CD. A mechanism is proposed for the inclusion process.
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Affiliation(s)
- A Anton Smith
- Department of Pharmacy, Annamalai University, Annamalai Nagar 608002, Tamilnadu, India
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40
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Antony Muthu Prabhu A, Sankaranarayanan RK, Siva S, Rajendiran N. Unusual spectral shifts on fast violet-B and benzanilide: Effect of solvents, pH and beta-cyclodextin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 74:484-497. [PMID: 19628426 DOI: 10.1016/j.saa.2009.06.049] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2008] [Revised: 06/18/2009] [Accepted: 06/23/2009] [Indexed: 05/28/2023]
Abstract
The absorption and fluorescence spectra of fast violet-B (FVB) and benzanilide (BA) have been analysed in different solvents, pH and beta-cyclodextrin. The inclusion complex of FVB with beta-CD is investigated by UV-visible, fluorimetry, AM 1, FTIR and SEM. The absorption maximum of FVB (anilino substitution) is red shifted than that of BA, but the benzoyl substitution hardly changed the ground state structure of BA. Compared to BA, the emission maxima of FVB largely blue shifted in cyclohexane and aprotic solvents, but red shifted in protic solvents and the longer wavelength maxima in FVB is due to the intramolecular charge transfer (TICT). In BA, the normal emission originates from a locally excited state and the longer wavelength band due to intramolecular proton transfer in non-polar/aprotic solvents and in protic solvents it is due to TICT state. beta-CD studies reveal that, FVB forms 1:2 complex from 1:1 complex and BA forms 1:2 complex with beta-CD.
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Affiliation(s)
- A Antony Muthu Prabhu
- Department of Chemistry, Annamalai University, Annamalai Nagar 608002, Tamilnadu, India
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41
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Prabhu AAM, Siva S, Sankaranarayanan RK, Rajendiran N. Intramolecular Proton Transfer Effects on 2,6-diaminopyridine. J Fluoresc 2009; 20:43-54. [DOI: 10.1007/s10895-009-0520-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2008] [Accepted: 07/08/2009] [Indexed: 11/29/2022]
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42
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Solvent Effects in Optical Spectra of ortho-Aminobenzoic Acid Derivatives. J Fluoresc 2009; 19:1053-60. [DOI: 10.1007/s10895-009-0505-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2009] [Accepted: 06/05/2009] [Indexed: 10/20/2022]
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43
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Terekhova IV. Volumetric and calorimetric study on complex formation of cyclodextrins with aminobenzoic acids. MENDELEEV COMMUNICATIONS 2009. [DOI: 10.1016/j.mencom.2009.03.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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44
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Fluorimetric study on the charge transfer behavior of trans-ethyl-(p-dimethylamino cinnamate) and its derivative in cyclodextrin cavities. J INCL PHENOM MACRO 2009. [DOI: 10.1007/s10847-008-9527-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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45
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Shanmugam M, Ramesh D, Nagalakshmi V, Kavitha R, Rajamohan R, Stalin T. Host-guest interaction of L-tyrosine with beta-cyclodextrin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 71:125-132. [PMID: 18243779 DOI: 10.1016/j.saa.2007.10.054] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2007] [Accepted: 10/30/2007] [Indexed: 05/25/2023]
Abstract
The inclusion complexes of beta-cyclodextrin (beta-CD) with L-tyrosine (L-TYN) were investigated by using spectrophotometers. The absorption and fluorescence enhancement occurs with beta-CD and L-TYN forms 1:1 inclusion complex. The unusual blue shift of hydroxyl ion in the beta-CD medium confirms OH groups present in the interior part of the beta-CD cavity and -COOH group present in the upper part of the beta-CD cavity. A mechanism is proposed to explain inclusion process. The inclusion interaction was examined and the thermodynamic parameters of inclusion process DeltaG, DeltaH and DeltaS were determined. The results indicated that the inclusion process was an exergonic and spontaneous process. Stable solid inclusion complexes were established and characterized by FT-IR, scanning electron microscope (SEM) methods.
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Affiliation(s)
- M Shanmugam
- Department of Chemistry, Muthayammal College of Arts and Science, Rasipuram, Namakkal 637408, Tamilnadu, India
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46
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Inclusion complex of charge transfer probe 4-amino-3-methyl benzoic acid methyl ester (AMBME) with β-CD in aqueous and non-aqueous medium: medium dependent stoichiometry of the complex and orientation of probe molecule inside β-CD nanocavity. J INCL PHENOM MACRO 2008. [DOI: 10.1007/s10847-008-9442-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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47
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Sancho MI, Jubert AH, Blanco SE, Ferretti FH, Castro EA. Determination of dissociation constants of p-hydroxybenzophenone in aqueous organic mixtures – Solvent effects. CAN J CHEM 2008. [DOI: 10.1139/v08-040] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The apparent acidity constant of p-hydroxybenzophenone, which is a practically insoluble drug in water but of great pharmaceutical interest, was determined by reversed-phase high-performance liquid chromatography in organic solvent – water mixtures (acetonitrile–water, ethanol–water, and methanol–water), varying the reaction medium permittivity in the interval 56 to 70, at constant ionic strength (0.050) and temperature (30 °C). A combined glass electrode calibrated with aqueous standard buffers was used to obtain pH readings based on the concentration scale (swpH). The pKa values from chromatographic data were obtained using the Hardcastle–Jano equation. Moreover, excellent linear relationships between the pKa values and solvation properties of the reaction medium (relative permittivity and Acity) were used to derive acid dissociation constants in aqueous solution. It has been concluded that the pKa values extrapolated from such solvent–water mixtures are consistent with each other and with previously reported measurements. In addition, the molecular structures of all the chemical species involved in the acid–base dissociation equilibrium studied were calculated with a B3LYP/6–311++G(d,p) method that makes use of the polarizable continuum model (PCM). Taking into account the theoretical pKa values, the conclusions obtained match our experimental determinations.Key words: solvent effects, p-hydroxybenzophenone, acidity constant, solvation parameters, structure, DFT calculation.
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48
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Rajendiran N, Balasubramanian T. Intramolecular charge transfer effects on 4-hydroxy-3-methoxybenzaldehyde. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 69:822-9. [PMID: 17625956 DOI: 10.1016/j.saa.2007.04.035] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2007] [Accepted: 04/20/2007] [Indexed: 05/16/2023]
Abstract
The absorption and fluorescence spectral characteristics of 4-hydroxy-3-methoxybenzaldehyde (HMB) have been studied in different solvents, pH and beta-cyclodextrin (beta-CD) and compared with 4-hydroxy-3,5-dimethoxybenzaldehyde (HDMB). The inclusion complex of HMB with beta-CD is analysed by UV-vis, fluorimetry, FT-IR, (1)H NMR, SEM and AM1 methods. In HMB, the normal emission (B band) is originates from a locally excited state and the longer emission (A band) is due to intramolecular charge transfer state (ICT). The OH group of HMB is present in the interior part of the beta-CD cavity and aldehyde group present in the upper part of the beta-CD cavity.
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Affiliation(s)
- N Rajendiran
- CAS in Marine Biology, Annamalai University, Parangipettai 608502, Tamilnadu, India.
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49
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Photoinduced intramolecular charge transfer in methyl ester of N,N′-Dimethylaminonaphthyl-(acrylic)-acid: Spectroscopic measurement and quantum chemical calculations. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2007.08.030] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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50
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Spectroscopic study of excited state intramolecular charge transfer in ethyl ester of N,N′-Dimethylaminonaphthyl-(acrylic)-acid. Chem Phys 2007. [DOI: 10.1016/j.chemphys.2007.09.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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