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Rajendiran N, Antony Muthu Prabhu A, Mohandoss T, Thulasidhasan J, Baskaran R. Spectral and Theoretical Investigation of Inclusion Complex between Cinnamic Acid and Hydroxycinnamic Acids with Native Cyclodextrins. Polycycl Aromat Compd 2022. [DOI: 10.1080/10406638.2020.1869794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- N. Rajendiran
- Department of Chemistry, Annamalai University, Annamalainagar, Tamil Nadu, India
| | - A. Antony Muthu Prabhu
- Department of PG Chemistry, Aditanar College of Arts and Science, Tiruchendur, Tamil Nadu, India
| | - T. Mohandoss
- Department of Chemistry, Annamalai University, Annamalainagar, Tamil Nadu, India
| | - J. Thulasidhasan
- Department of Chemistry, Annamalai University, Annamalainagar, Tamil Nadu, India
| | - R. Baskaran
- Department of Chemistry, Annamalai University, Annamalainagar, Tamil Nadu, India
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2
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Maniyazagan M, Chakraborty S, Pérez-Sánchez H, Stalin T. Encapsulation of triclosan within 2-hydroxypropyl–β–cyclodextrin cavity and its application in the chemisorption of rhodamine B dye. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.02.113] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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3
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Sonaimuthu M, Balakrishnan SB, Kuppu SV, Veerakanellore GB, Thambusamy S. Spectral and proton transfer behavior of 1,4-dihydroxylanthraquinone in aqueous and confined media; molecular modelling strategy. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.03.042] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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4
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Asiri AM, Osman OI, Al-Thaqafy SH, Khan SA. Optical properties and fluorescence quenching of carbazole containing (D–π–A) push–pull chromophores by silver nanoparticles: a detailed insight via an experimental and theoretical approach. RSC Adv 2017. [DOI: 10.1039/c6ra25741k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
(4Z)-4-[(9-Ethyl-9H-carbazol-3-yl)methylidene]-2-phenyl-1,3-oxazol-5(4H)-one (ECPO) was prepared by the one-pot multi-component reaction of 9-ethyl-9H-carbazole-3-carbaldehyde, hippuric acid, anhydrous sodium acetate and acetic anhydride under microwave irradiation.
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Affiliation(s)
- Abdullah M. Asiri
- Department of Chemistry
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
| | - Osman I. Osman
- Department of Chemistry
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
| | - Saad H. Al-Thaqafy
- Department of Chemistry
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
| | - Salman A. Khan
- Department of Chemistry
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
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Santos GTAD, Santos PSM, Duarte AC. Vanillic and syringic acids from biomass burning: Behaviour during Fenton-like oxidation in atmospheric aqueous phase and in the absence of light. JOURNAL OF HAZARDOUS MATERIALS 2016; 313:201-208. [PMID: 27085101 DOI: 10.1016/j.jhazmat.2016.04.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 03/13/2016] [Accepted: 04/05/2016] [Indexed: 06/05/2023]
Abstract
Biomass combustion is a threat to the environment since it emits to the atmosphere organic compounds, which may react and originate others more aggressive. This work studied the behaviours of vanillic and syringic acids, small aromatic tracers of biomass burning, during Fenton-like oxidation in aqueous phase and absence of light. For both compounds, the extent of oxidation increased with pH decrease from neutral to acid in atmospheric waters, but for vanillic acid the neutral pH was not able of promoting the oxidation. With the oxidation of both acids were formed chromophoric compounds, and the formation rate increased with the degree of electron-donator substituents in benzene ring. The initial and produced compounds were not totally degraded up to 24h of reaction at pH 4.5, suggesting that the night period may be not sufficient for their full degradation in atmospheric waters. The major compounds formed were the 3,4-dihydroxybenzoic acid for vanillic acid, and the 1,4-dihydroxy-2,6-dimethoxybenzene for syringic acid. These findings suggest the occurrence of an ipso attack by the hydroxyl radical preferential to the methoxy and carboxyl groups of vanillic and syringic acids, respectively. It is important to highlight that for both aromatic acids the main compounds produced are also small aromatic compounds.
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Affiliation(s)
- Gabriela T A D Santos
- CESAM (Centre for Environmental and Marine Studies) & Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Patrícia S M Santos
- CESAM (Centre for Environmental and Marine Studies) & Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
| | - Armando C Duarte
- CESAM (Centre for Environmental and Marine Studies) & Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
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Rajendiran N, Jude Jenita M. Encapsulation of 4-hydroxy-3-methoxy benzoic acid and 4-hydroxy-3,5-dimethoxy benzoic acid with native and modified cyclodextrins. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 136 Pt C:1349-1357. [PMID: 25459693 DOI: 10.1016/j.saa.2014.09.139] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 09/22/2014] [Accepted: 09/25/2014] [Indexed: 06/04/2023]
Abstract
Inclusion complex formation of 4-hydroxy-3-methoxybenzoic acid (HMBA) and 4-hydroxy-3,5-dimethoxybenzoic acid (HDMBA) with α-CD, β-CD, HP-α-CD and HP-β-CD were studied by absorption, steady state fluorescence, time resolved fluorescence, FT-IR, (1)H NMR and molecular modeling methods. The effect of the CDs with HMBA and HDMBA were studied in pH∼1, pH∼7 and pH∼10 buffer solutions. The study revealed that both hydroxybenzoic acids formed 1:1 complex with the four CDs. The theoretical values suggest that both guests are partially encapsulated into the CDs cavity. The hydroxy group is present in the interior part of the CD cavity and carboxyl group is present in the hydrophilic part of the CD cavity. Molecular modeling studies proved that (i) the negative Gibbs energy and enthalpy changes for the inclusion complexes indicated that the formation of these complexes were spontaneous and exothermic, (ii) hydrogen bonding interactions played a major role in the inclusion process, (iii) the dipole moment values for guests increased when they entered into the CDs cavities which is an indication of the increase of the polarity and the formation of complex and (iv) differences in binding energy and enthalpy change suggest that the β-CD formed more stable complex than α-CD.
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Affiliation(s)
- N Rajendiran
- Department of Chemistry, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu, India.
| | - M Jude Jenita
- Department of Chemistry, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu, India
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7
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Antony Muthu Prabhu A, Suresh Kumar GS. Inclusion complexation of phenoxyaliphatic acid derivatives of 3,3'-bis(indolyl)methanes with β-cyclodextrin. J Fluoresc 2014; 24:925-31. [PMID: 24619770 DOI: 10.1007/s10895-014-1373-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 02/24/2014] [Indexed: 10/25/2022]
Abstract
The inclusion complexation behavior of phenoxyaliphatic acid derivatives of 3,3'-bis(indolyl)methane (BIMs 1-5) with β-cyclodextrin (β-CD) were investigated in both solution and solid state by means of UV-Visible, fluorescence spectroscopy, FT-IR and (1)H NMR techniques. The nature of the host-guest inclusion complex between BIMs and β-CD has been elucidated. The experimental results confirmed the existence of 1:1 inclusion complex of BIMs with β-CD. The binding constants describing the extent of formation of the complexes have been determined using Benesi-Hildebrand plots using UV-Vis and fluorescence spectroscopy. BIMs exhibited an affinity for β-CD. The spectral studies suggested the phenyl ring along with alkyl substitutions of BIMs is present inside of β-CD cavity.
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Affiliation(s)
- A Antony Muthu Prabhu
- Department of Chemistry, Manonmaniam Sundaranar University, Tirunelveli, 627 012, Tamilnadu, India,
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8
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Rajendiran N, Venkatesh G. Inclusion complexation of 4,4′-dihydroxybenzophenone and 4-hydroxybenzophenone with α- and β-cyclodextrins. Supramol Chem 2014. [DOI: 10.1080/10610278.2013.873125] [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: 10/25/2022]
Affiliation(s)
- N. Rajendiran
- Department of Chemistry, Annamalai University, Annamalainagar 608 002, TamilnaduIndia
| | - G. Venkatesh
- Department of Chemistry, Annamalai University, Annamalainagar 608 002, TamilnaduIndia
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Spectral and molecular modeling studies on hydroxybenzaldehydes with native and modified cyclodextrins. J Fluoresc 2013; 24:695-707. [PMID: 24310479 DOI: 10.1007/s10895-013-1340-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Accepted: 11/27/2013] [Indexed: 10/25/2022]
Abstract
The inclusion complexation of 2-hydroxy-3-methoxybenzaldehyde (2HMB), 4-hydroxy-3-methoxybenzaldehyde (4HMB), 3,4-dimethoxybenzaldehyde (DMB) and 4-hydroxy-3,5-dimethoxybenzaldehyde (HDMB) with α-CD, β-CD, HP-α-CD and HP-β-CD were carried out by UV-Visible, steady-state and time-resolved fluorescence and PM3 methods. All the benzaldehydes shows dual fluorescence in aqueous and CD mediums and 1:1 inclusion complexes were formed with CDs. PM3 geometry optimizations results indicate that the HDMB/CD complex is significantly more favorable than the other complexes. The negative enthalpy changes suggest that the inclusion complexation processes are spontaneous. The geometry of the most stable complex shows that methoxy/OH group of HMBs is entrapped in the less polar CD cavities, while the aldehyde group present in the upper part of the CDs cavities.
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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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11
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Oztürk G, Karabıyık H, Aygün M, Alp S, Ozçelik S. Tuning photoinduced intramolecular electron transfer by electron accepting and donating substituents in oxazolones. J Fluoresc 2013; 23:733-44. [PMID: 23494168 DOI: 10.1007/s10895-013-1198-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2012] [Accepted: 02/24/2013] [Indexed: 11/25/2022]
Abstract
The solvatochromic and spectral properties of oxazolone derivatives in various solvents were reported. Fluorescence spectra clearly showed positive and negative solvatochromism depending on substituents. The solvatochromic plots and quantum chemical computations at DFT-B3LYP/6-31 + G(d,p) level were used to assess dipole moment changes between the ground and the first excited singlet-states. The electron accepting nitro substituent at the para-position increased the π-electron mobility, however, the 3,5-dinitro substituent decreased the π-electron mobility as a result of inverse accumulation of the electronic density as compared with that of its ground state. Experimental and computational studies proved that the photoinduced intramolecular electron transfer (PIET) is responsible for the observed solvatochromic effects. We demonstrate that PIET can be finely tailored by the position of the electron accepting and donating substituents in the phenyl ring of the oxazolone derivatives. We propose that the photoactive CPO derivatives are new molecular class of conjugated push-pull structures using azlactone moiety as the π-conjugated linker and may find applications in photovoltaic cells and light emitting diodes.
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Affiliation(s)
- Gülsiye Oztürk
- Department of Chemistry, Dokuz Eylül University, 35160, Izmir, Turkey
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12
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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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Sankaranarayanan R, Siva S, Venkatesh G, Muthu Prabhu AA, Rajendiran N. Dual fluorescence of dothiepin, doxepin drugs—effect of solvents and β-cyclodextrin. J Mol Liq 2011. [DOI: 10.1016/j.molliq.2011.04.016] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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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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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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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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17
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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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18
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Chakraborty S, Basu S, Lahiri A, Basak S. Inclusion of chrysin in β-cyclodextrin nanocavity and its effect on antioxidant potential of chrysin: A spectroscopic and molecular modeling approach. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2010.05.030] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Unusual Spectral Shifts of Imipramine and Carbamazepine Drugs. J Fluoresc 2010; 20:1199-210. [DOI: 10.1007/s10895-010-0669-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2009] [Accepted: 04/26/2010] [Indexed: 11/27/2022]
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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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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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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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24
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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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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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26
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Song LX, Wang HM, Xu P, Yang Y, Zhang ZQ. Experimental and Theoretical Studies on the Inclusion Complexation of Syringic Acid with .ALPHA.-, .BETA.-, .GAMMA.- and Heptakis(2,6-di-O-methyl)-.BETA.-cyclodextrin. Chem Pharm Bull (Tokyo) 2008; 56:468-74. [DOI: 10.1248/cpb.56.468] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Le Xin Song
- Department of Chemistry, University of Science and Technology of China
| | - Hai Ming Wang
- Department of Chemistry, University of Science and Technology of China
| | - Peng Xu
- Department of Chemistry, University of Science and Technology of China
| | - Yan Yang
- Department of Chemical Engineering, Anhui University of Science and Technology
| | - Zi Qiang Zhang
- Department of Chemistry, University of Science and Technology of China
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Rajendiran N, Balasubramanian T. Dual fluorescence of syringaldazine. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 68:894-904. [PMID: 17317290 DOI: 10.1016/j.saa.2007.01.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2006] [Accepted: 12/07/2006] [Indexed: 05/14/2023]
Abstract
The absorption and fluorescence spectra of syringaldazine (SYAZ) has been recorded in solvents of different polarity, pH and beta-cyclodextrin (beta-CD) and compared with syringaldehyde (SYAL). The inclusion complex of SYAZ with beta-CD is investigated by UV-vis, fluorimetry, AM 1, FT-IR, (1)H NMR and scanning electron microscope (SEM). DeltaG value suggests the inclusion process is an exothermic and spontaneous. In all solvents a dual fluorescence is observed for SYAZ, whereas, SYAL shows a dual luminescence only in polar solvents. The excitation spectra for the 410 nm is different from 340 nm indicate two different species present in this molecule. In pH solutions: (i) a large red shifted maxima is observed in the dianion and is due to large interactions between the aromatic ring and (ii) the large blue shift at pH approximately 4.5, is due to dissociation of azine group and formation of aldehyde. beta-CD studies reveal that, SYAZ forms a 1:2 complex from 1:1 complex with beta-CD.
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Affiliation(s)
- N Rajendiran
- CAS in Marine Biology, Annamalai University, Parangipettai 608502, Tamilnadu, India.
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Rajendiran N, Balasubramanian T. Dual fluorescence of N-phenylanthranilic acid: Effect of solvents, pH and beta-cyclodextrin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 68:867-76. [PMID: 17433768 DOI: 10.1016/j.saa.2006.12.072] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2006] [Accepted: 12/05/2006] [Indexed: 05/14/2023]
Abstract
Spectral characteristics of N-phenylanthranilic acid (NPAA) have been studied in different solvents, pH and beta-cyclodextrin (beta-CD) and compared with anthranilic acid (2-aminobenzoic acid, 2ABA). In all solvents a dual fluorescence is observed in NPAA, whereas 2ABA gives single emission. Combining the results observed in the absorption, fluorescence emission and fluorescence excitation spectra, it is found that strong intramolecular hydrogen bonding (IHB) interactions present in NPAA molecule. The inclusion complex of NPAA with beta-CD is analysed by UV-vis, fluorimetry, FT-IR, (1)H NMR, scanning electron microscope and AM 1 method. The above spectral studies show that NPAA forms a 1:1 inclusion complex with beta-CD and COOH group present in the beta-CD cavity. A mechanism is proposed to explain the inclusion process.
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Affiliation(s)
- N Rajendiran
- CAS in Marine Biology, Annamalai University, Parangipettai 608502, Tamil Nadu, India.
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Smith AA, Kannan K, Manavalan R, Rajendiran N. Spectral Characteristics of Bicalutamide Drug in Different Solvents and β-Cyclodextrin. J INCL PHENOM MACRO 2006. [DOI: 10.1007/s10847-006-9138-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Intramolecular charge transfer associated with hydrogen bonding effects on 2-aminobenzoic acid. J Photochem Photobiol A Chem 2006. [DOI: 10.1016/j.jphotochem.2006.02.002] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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