1
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Yaroshenko NS, Kostjukova LO, Kostjukov VV. Excited states of six oxazine 1 conformers in aqueous solution: TD-DFT/DFT study. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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2
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Haley RM, Gottardi R, Langer R, Mitchell MJ. Cyclodextrins in drug delivery: applications in gene and combination therapy. Drug Deliv Transl Res 2021; 10:661-677. [PMID: 32077052 DOI: 10.1007/s13346-020-00724-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Gene therapy is a powerful tool against genetic disorders and cancer, targeting the source of the disease rather than just treating the symptoms. While much of the initial success of gene delivery relied on viral vectors, non-viral vectors are emerging as promising gene delivery systems for efficacious treatment with decreased toxicity concerns. However, the delivery of genetic material is still challenging, and there is a need for vectors with enhanced targeting, reduced toxicity, and controlled release. In this article, we highlight current work in gene therapy which utilizes the cyclic oligosaccharide molecule cyclodextrin (CD). With a number of unique abilities, such as hosting small molecule drugs, acting as a linker or modular component, reducing immunogenicity, and disrupting membranes, CD is a valuable constituent in many delivery systems. These carriers also demonstrate great promise in combination therapies, due to the ease of assembling macromolecular structures and wide variety of chemical derivatives, which allow for customizable delivery systems and co-delivery of therapeutics. The use of combination and personalized therapies can result in improved patient health-modular systems, such as those which incorporate CD, are more conducive to these therapy types. Graphical abstract.
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Affiliation(s)
- Rebecca M Haley
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Riccardo Gottardi
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, 19104, USA.,Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA.,Fondazione Ri.MED, Palermo, Italy
| | - Robert Langer
- Department of Chemical Engineering and Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Michael J Mitchell
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, 19104, USA. .,Abramson Cancer Center, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA. .,Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA. .,Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA. .,Institute for Regenerative Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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3
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Host assisted molecular recognition by human serum albumin: Study of molecular recognition controlled protein/drug mimic binding in a microfluidic channel. Int J Biol Macromol 2021; 176:137-144. [PMID: 33548310 DOI: 10.1016/j.ijbiomac.2021.02.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 01/29/2021] [Accepted: 02/01/2021] [Indexed: 11/21/2022]
Abstract
Human serum albumin (HSA) plays a pivotal role in drug release from its delivery vehicles such as cyclodextrins (CDs) by binding to the drugs. Here molecular recognition and binding of a drug mimic (CD1) to HSA have been explored in a microfluidic channel when CD1 is encapsulated in β-cyclodextrin (βCD) and heptakis(2,3,6-tri-O-methyl)-β-cyclodextrin (TRIMEB), respectively, to investigate whether change of the host vehicle modulate the rate of drug binding to the serum protein. Molecular recognition of βCD encapsulated CD1 by HSA occurs by the conformational selection fit mechanism leading to rapid binding of CD1 to HSA (k1 ~ 700 s-11) when the βCD/CD1 complex interacts with HSA. In contrary, HSA recognizes CD1 encapsulated in TRIMEB by an induced fit mechanism leading to a significantly slower binding rate (k1 ~ 20.8 s-1) of the drug mimic to the protein. Thus molecular recognition controls the rate of HSA binding by CD1 which in turn modulates the rate of delivery of the drug mimic from its macrocyclic hosts. The remarkable change in the molecular recognition pathway of CD1 by HSA, upon change of the host from βCD to TRIMEB, originates from significantly different conformational flexibility of the host/drug mimic complexes.
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4
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Erdős M, Hartkamp R, Vlugt TJH, Moultos OA. Inclusion Complexation of Organic Micropollutants with β-Cyclodextrin. J Phys Chem B 2020; 124:1218-1228. [PMID: 31976678 PMCID: PMC7037149 DOI: 10.1021/acs.jpcb.9b10122] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
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Recently, β-cyclodextrin
(βCD)-based polymers with
enhanced adsorption kinetics and high removal capacity of organic
micropollutants (OMPs) and uptake rates have been synthesized and
tested experimentally. Although the exact physical–chemical
mechanisms via which these polymers capture the various types of OMPs
are not yet fully understood, it is suggested that the inclusion complex
formation of OMPs with βCD is very important. In this study,
the inclusion complex formation of OMPs with βCD in an aqueous
solution is investigated by using the well-established attach–pull–release
method in force field-based molecular dynamics simulations. A representative
set of OMPs is selected based on the measured occurrences in surface
and ground waters and the directives published by the European Union.
To characterize the formation of the inclusion complex, the binding
free energies, enthalpies, and entropies are computed and compared
to experimental values. It is shown that computations using the q4md-CD/GAFF/Bind3P
force field combination yield binding free energies that are in reasonable
agreement with the experimental results for all OMPs studied. The
binding enthalpies are decomposed into the main contributing interaction
types. It is shown that, for all studied OMPs, the van der Waals interactions
are favorable for the inclusion complexion and the hydrogen bond formation
of the guest with the solvent and βCD plays a crucial role in
the binding mechanism. Our findings show that MD simulations can adequately
describe the inclusion complex formation of βCD with OMPs, which
is the first step toward understanding the underlying mechanisms via
which the βCD-based polymers capture OMPs.
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Affiliation(s)
- Máté Erdős
- Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering , Delft University of Technology , Leeghwaterstraat 39 , 2628CB Delft , Netherlands
| | - Remco Hartkamp
- Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering , Delft University of Technology , Leeghwaterstraat 39 , 2628CB Delft , Netherlands
| | - Thijs J H Vlugt
- Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering , Delft University of Technology , Leeghwaterstraat 39 , 2628CB Delft , Netherlands
| | - Othonas A Moultos
- Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering , Delft University of Technology , Leeghwaterstraat 39 , 2628CB Delft , Netherlands
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5
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Yadav N, Chowdhury PK, Ganguli AK. Mechanistic Insights into the Growth of Anisotropic Nanostructures Inside Reverse Micelles: A Solvation Perspective. J Phys Chem B 2019; 123:5324-5336. [PMID: 31242745 DOI: 10.1021/acs.jpcb.9b02459] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Reverse micelles (RMs) as soft templates have been successfully used in tailoring the structural characteristics (size and morphology) of nanomaterials that in turn have been used in various applications. In this work, we have focused on the local perturbations in the different interior domains of the cetyltrimethylammonium bromide-reverse micelle-based soft template en route to nanorod formation by monitoring the solvation response of coumarin-based solvatochromic probes (C343 and C153). We have observed an appreciable retardation of the solvent coordinate during the initial phases of nanorod growth, which we have attributed to the reorientational motion of the water molecules lodged in the interfacial region. Moreover, these rigid nanostructures leave their imprints on the soft interfacial layer as was observed from the direct correlation in the solvation response of RM-containing nanostructures and respective surfactant aggregates in supernatant solution. Supporting data from time-resolved anisotropy studies further reinforced our conclusions from the solvation experiments. Our study proves that the hydration dynamics can be a promising tool in tracking the heterogeneous growth evolution of nanostructure formation in RMs since solvent reorganization provides insights into the intrinsic, molecular-level features of the micellar assemblies.
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Affiliation(s)
- Nitin Yadav
- Department of Chemistry , Indian Institute of Technology , Hauz Khas, New Delhi 110016 , India
| | - Pramit K Chowdhury
- Department of Chemistry , Indian Institute of Technology , Hauz Khas, New Delhi 110016 , India
| | - Ashok K Ganguli
- Department of Chemistry , Indian Institute of Technology , Hauz Khas, New Delhi 110016 , India
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6
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Cheng JG, Yu HJ, Chen Y, Liu Y. Selective binding and controlled release of anticancer drugs by polyanionic cyclodextrins. Bioorg Med Chem 2018; 26:2287-2290. [DOI: 10.1016/j.bmc.2018.03.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 03/08/2018] [Accepted: 03/08/2018] [Indexed: 02/06/2023]
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7
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Csepregi R, Lemli B, Kunsági-Máté S, Szente L, Kőszegi T, Németi B, Poór M. Complex Formation of Resorufin and Resazurin with Β-Cyclodextrins: Can Cyclodextrins Interfere with a Resazurin Cell Viability Assay? Molecules 2018; 23:molecules23020382. [PMID: 29439432 PMCID: PMC6017802 DOI: 10.3390/molecules23020382] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 02/07/2018] [Accepted: 02/08/2018] [Indexed: 01/15/2023] Open
Abstract
Resazurin (or Alamar Blue) is a poorly fluorescent dye. During the cellular reduction of resazurin, its highly fluorescent product resorufin is formed. Resazurin assay is a commonly applied method to investigate viability of bacterial and mammalian cells. In this study, the interaction of resazurin and resorufin with β-cyclodextrins was investigated employing spectroscopic and molecular modeling studies. Furthermore, the influence of β-cyclodextrins on resazurin-based cell viability assay was also tested. Both resazurin and resorufin form stable complexes with the examined β-cyclodextrins (2.0–3.1 × 103 and 1.3–1.8 × 103 L/mol were determined as binding constants, respectively). Cells were incubated for 30 and 120 min and treated with resazurin and/or β-cyclodextrins. Our results suggest that cyclodextrins are able to interfere with the resazurin-based cell viability assay that presumably results from the following mechanisms: (1) inhibition of the cellular uptake of resazurin and (2) enhancement of the fluorescence signal of the formed resorufin.
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Affiliation(s)
- Rita Csepregi
- Department of Laboratory Medicine, University of Pécs, Medical School, Pécs H-7624, Hungary; (R.C.); (T.K.)
- János Szentágothai Research Center, University of Pécs, Pécs H-7624, Hungary; (B.L.); (S.K.-M.)
| | - Beáta Lemli
- János Szentágothai Research Center, University of Pécs, Pécs H-7624, Hungary; (B.L.); (S.K.-M.)
- Department of General and Physical Chemistry, University of Pécs, Pécs H-7624, Hungary
- Department of Pharmaceutical Chemistry, University of Pécs, Faculty of Pharmacy, Pécs H-7624, Hungary
| | - Sándor Kunsági-Máté
- János Szentágothai Research Center, University of Pécs, Pécs H-7624, Hungary; (B.L.); (S.K.-M.)
- Department of General and Physical Chemistry, University of Pécs, Pécs H-7624, Hungary
- Department of Pharmaceutical Chemistry, University of Pécs, Faculty of Pharmacy, Pécs H-7624, Hungary
| | - Lajos Szente
- CycloLab Cyclodextrin Research & Development Laboratory, Ltd., Budapest H-1097, Hungary;
| | - Tamás Kőszegi
- Department of Laboratory Medicine, University of Pécs, Medical School, Pécs H-7624, Hungary; (R.C.); (T.K.)
- János Szentágothai Research Center, University of Pécs, Pécs H-7624, Hungary; (B.L.); (S.K.-M.)
| | - Balázs Németi
- Department of Pharmacology, University of Pécs, Faculty of Pharmacy, Pécs H-7624, Hungary;
| | - Miklós Poór
- János Szentágothai Research Center, University of Pécs, Pécs H-7624, Hungary; (B.L.); (S.K.-M.)
- Department of Pharmacology, University of Pécs, Faculty of Pharmacy, Pécs H-7624, Hungary;
- Correspondence: ; Tel.: +36-72-536-000 (ext. 31646)
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8
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Thorave RG, Lande DN, Athare SV, Gejji SP, Gonnade RG, Malkhede DD. X-ray structure, spectral characteristics, thermal and redox behavior of quinoline encapsulated in sulfonatocalix[4]arene. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.09.061] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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9
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Awasthi AA, Singh PK. Excited-State Proton Transfer on the Surface of a Therapeutic Protein, Protamine. J Phys Chem B 2017; 121:10306-10317. [PMID: 29032681 DOI: 10.1021/acs.jpcb.7b07151] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Proton transfer reactions on biosurfaces play an important role in a myriad of biological processes. Herein, the excited-state proton transfer reaction of 8-hydroxypyrene-1,3,6-trisulfonate (HPTS) has been investigated in the presence of an important therapeutic protein, Protamine (PrS), using ground-state absorption, steady-state, and detailed time-resolved emission measurements. HPTS forms a 1:1 complex with Protamine with a high association constant of 2.6 × 104 M-1. The binding of HPTS with Protamine leads to a significant modulation in the ground-state prototropic equilibrium causing a downward shift of 1.1 unit in the acidity constant (pKa). In contrast to a large number of reports of slow proton transfer of HPTS on biosurfaces, interestingly, HPTS registers a faster proton transfer event in the presence of Protamine as compared to that of even the bulk aqueous buffer medium. Furthermore, the dimensionality of the proton diffusion process is also significantly reduced on the surface of Protamine that is in contrast to the behavior of HPTS in the bulk aqueous buffer medium, where the proton diffusion process is three-dimensional. The effect of ionic strength on the binding of HPTS toward PrS suggests a predominant role of electrostatic interaction between anionic HPTS and cationic Protamine, which is further supported by molecular docking simulations which predict that the most preferable binding site for HPTS on the surface of Protamine is surrounded by multiple cationic arginine residues.
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Affiliation(s)
| | - Prabhat K Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400085, India.,Homi Bhabha National Institute , Training School Complex, Anushaktinagar, Mumbai 400094, India
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10
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Majhi D, Pabbathi A, Sarkar M. Probing the Aggregation Behavior of Neat Imidazolium-Based Alkyl Sulfate (Alkyl = Ethyl, Butyl, Hexyl, and Octyl) Ionic Liquids through Time Resolved Florescence Anisotropy and NMR and Fluorescence Correlation Spectroscopy Study. J Phys Chem B 2015; 120:193-205. [DOI: 10.1021/acs.jpcb.5b10137] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Debashis Majhi
- School
of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar, Orissa 751005, India
| | - Ashok Pabbathi
- Department
of Chemistry, University of Hyderabad, Hyderabad, Telangana 500046, India
| | - Moloy Sarkar
- School
of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar, Orissa 751005, India
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11
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Huang K, Li L, Wang J, Zhou Z, Guo X. Tunable double-stranded inclusion complexes of γ-cyclodextrin threaded onto non-modified poly(ethylene glycol). Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3788-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Trencanova MG, Jane E, Szocs V, Halaszova S, Jerigova M, Haizer L, Velic D. Fluorescence Dynamics of Monocyclodextrin- and Bis(thiol-cyclodextrin)-Coumarin C153 Complexes. Chemphyschem 2015; 16:2466-73. [DOI: 10.1002/cphc.201500119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 04/25/2015] [Indexed: 11/08/2022]
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13
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Sayed M, Sundararajan M, Mohanty J, Bhasikuttan AC, Pal H. Photophysical and Quantum Chemical Studies on the Interactions of Oxazine-1 Dye with Cucurbituril Macrocycles. J Phys Chem B 2015; 119:3046-57. [DOI: 10.1021/jp509243j] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Mahesh Sundararajan
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Jyotirmayee Mohanty
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Achikanath C. Bhasikuttan
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Haridas Pal
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
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14
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Shaikh M, Mohanty J, Sundararajan M, Bhasikuttan AC, Pal H. Supramolecular Host–Guest Interactions of Oxazine-1 Dye with β- and γ-Cyclodextrins: A Photophysical and Quantum Chemical Study. J Phys Chem B 2012; 116:12450-9. [DOI: 10.1021/jp3087368] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Mhejabeen Shaikh
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India
| | - Jyotirmayee Mohanty
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India
| | - Mahesh Sundararajan
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India
| | - Achikanath C. Bhasikuttan
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India
| | - Haridas Pal
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India
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15
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Balomenou I, Kaloudi-Chantzea A, Karakostas N, Yannakopoulou K, Mavridis IM, Pistolis G. Controlling the stereospecificity of a volume-conserving adiabatic photoisomerization within a nanotubular self-assembled cage: a reversible light-heat torque converter. J Phys Chem B 2011; 115:10665-81. [PMID: 21812460 DOI: 10.1021/jp2037608] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present herein a host-guest supramolecular system by which we were able to obtain precise control of the stereospecificity of a new and unusual adiabatic photoisomerization reaction capable of restoring reversibly the original configuration. The host-guest system is composed of (a) a naphthalene ring linked centrosymmetrically-via sp(2) hybridized oxygen atoms-with methoxytriethyleneglycol chains (1) and (b) a nanotubular cage formed by four self-assembled face-to-face β-cyclodextrins threaded onto the long "axle" of 1. The compound 1 can exist in distinct cis,cis, cis,trans, and trans,trans conformations that are spectrally distinguishable (see Scheme 1 ). Spectroscopic and kinetic manifestations of the torsional isomerization of 1 in the lowest excited singlet state both in solution and within the tubular cage were investigated. The results provide clear evidence that the compact cavity completely blocks the photoisomerization pathway manifested in common solution (cis,cis* → cis,trans*), allowing observation of stereospecific, volume-conserving turning of the naphthalene ring about the two "quasidouble" bonds C(Naph)-O by φ ≈ 180° (cis,cis* → trans,trans*). The photoisomerization is purely adiabatic, and the encaged molecule restores its original configuration by generating torque thermally, when relaxing to the ground state.
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Affiliation(s)
- Ioanna Balomenou
- NCSR Demokritos Institute of Physical Chemistry, 153 10 Athens, Greece
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16
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Gilani AG, Moghadam M, Zakerhamidi MS. Estimation of ground- and excited-state dipole moments of oxazine 1 in liquid and liquid crystalline media. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:148-155. [PMID: 21440491 DOI: 10.1016/j.saa.2011.02.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2010] [Revised: 02/08/2011] [Accepted: 02/16/2011] [Indexed: 05/30/2023]
Abstract
The absorption and fluorescence spectra of a laser dye, oxazine-1 (OX1), in liquid and liquid crystalline media were studied at room temperature. The solvatochromic method was used to determine the ground- and excited-state dipole moments by means of Lippert-Mataga, Bakshiev, Kawski-Chamma-Viallet polarity functions. The solvent polarity has no large and regular effect on the spectral behavior of OX1, and thus it might be considered as a poor solvatochromic indicator dye. In addition, applicability of solvatochromic method for this dye in anisotropic media was investigated. On the other hand, nature and degree of the solute-solvent interactions were characterized using correlation of multi-parameter solvent polarity scales. Due to the theoretical restrictions and the dye molecular structure, deviations from the solvatochromic correlation were observed.
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17
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Marchena M, Gil M, Martín C, Organero JA, Sanchez F, Douhal A. Stability and Photodynamics of Lumichrome Structures in Water at Different pHs and in Chemical and Biological Caging Media. J Phys Chem B 2011; 115:2424-35. [DOI: 10.1021/jp110134f] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Maria Marchena
- Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Departamento de Quimica Fisica, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N. 45071 Toledo, Spain
- Facultad de Quimica, Departamento de Quimica Fisica, Universidad de Sevilla, Calle Profesor Garcia Gonzalez, S.N. 41012 Sevilla, Spain
| | - Michał Gil
- Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Departamento de Quimica Fisica, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N. 45071 Toledo, Spain
| | - Cristina Martín
- Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Departamento de Quimica Fisica, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N. 45071 Toledo, Spain
| | - Juan Angel Organero
- Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Departamento de Quimica Fisica, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N. 45071 Toledo, Spain
| | - Francisco Sanchez
- Facultad de Quimica, Departamento de Quimica Fisica, Universidad de Sevilla, Calle Profesor Garcia Gonzalez, S.N. 41012 Sevilla, Spain
| | - Abderrazzak Douhal
- Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Departamento de Quimica Fisica, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N. 45071 Toledo, Spain
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18
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Structural characterization of the Brooker’s merocyanine/β-cyclodextrin complex using NMR spectroscopy and molecular modeling. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2009.11.034] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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19
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Jana M, Bandyopadhyay S. Microscopic investigation of the hydration properties of cyclodextrin and its substituted forms. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:13084-91. [PMID: 19739659 DOI: 10.1021/la902003y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Substitution of the hydroxyl (OH) groups of cyclodextrins (CDs) by methoxy (OCH(3)) groups is likely to influence the microscopic properties of water inside the cavities of these molecules and in the surrounding hydration layers. We have performed atomistic molecular dynamics (MD) simulations of aqueous solutions of beta-cyclodextrin (BCD) and its two methyl-substituted forms, dimethyl beta-cyclodextrin (DIMEB) and trimethyl beta-cyclodextrin (TRIMEB). The calculations reveal that the translational and rotational motions of water present either in the hydration layers or in the cavities of these macrocyclic molecules are slower than that of pure bulk water. Interestingly, it is noticed that the effect of confinement inside the cavity increases with substitution of the OH groups of the BCD molecule. Most importantly, it is revealed that the time scale of relaxation of the CD-water (CW) and water-water (WW) hydrogen bonds are correlated with the microscopic dynamics of water and their degree of confinement within the cavities of these molecules.
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Affiliation(s)
- Madhurima Jana
- Molecular Modeling Laboratory, Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India
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20
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Sahoo D, Bhattacharya P, Chakravorti S. On the Spectral Behavior of an Ionic Styryl Dye: Effect of Micelle−Polyethylene-block-polyethylene Glycol Diblock Copolymer Assembly. J Phys Chem B 2009; 113:13560-5. [DOI: 10.1021/jp906221k] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dibakar Sahoo
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Prosenjit Bhattacharya
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Sankar Chakravorti
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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21
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Mallick A. Rotational relaxation dynamics of a β-carboline analogue in cyclodextrin nanocavity: How does the cavity size barricade the molecular rotation? J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2009.06.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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22
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Ghanadzadeh A, Zeini A, Kashef A, Moghadam M. Solvent polarizability and anisotropy effects on the photophysical behavior of oxazine 1: an appropriate polarizability indicator dye. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 73:324-329. [PMID: 19324588 DOI: 10.1016/j.saa.2009.02.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2008] [Revised: 02/13/2009] [Accepted: 02/19/2009] [Indexed: 05/27/2023]
Abstract
The spectroscopic features of a laser dye, oxazine 1 (OX1), were investigated in liquid and in liquid crystalline solutions as a function of the solvent polarity and polarizability. The nature of spectral shift was investigated by studying the absorption spectra of the dye in different solvents. The spectral shifts were correlated by the solvent polarity and polarizability. As a result, the solvent polarity has no large and regular effect on the spectral behavior of the dye, and thus it might be considered as a poor solvatochromic dye. In contrast, an excellent linear correlation was observed between the solvent polarizability and the spectral properties of the dye, and therefore, this dye might be considered as a good indicator for measuring the solvent polarizability. The absorption and fluorescence spectra of the dye were investigated in nematic solvents with high birefringence. In nematic solvents, anisotropy of polarizability has a major contribution to the shaping of the absorbance and emission spectra of OX1.
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Affiliation(s)
- A Ghanadzadeh
- Department of Chemistry, Faculty of Science, University of Guilan, Rash 41335, Iran.
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23
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Mahata A, Sarkar D, Bose D, Ghosh D, Das P, Chattopadhyay N. Photophysics and rotational relaxation dynamics of a β-carboline based fluorophore in cationic alkyltrimethylammonium bromide micelles. J Colloid Interface Sci 2009; 335:234-41. [DOI: 10.1016/j.jcis.2009.03.086] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Revised: 02/28/2009] [Accepted: 03/02/2009] [Indexed: 10/20/2022]
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24
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Mahata A, Sarkar D, Bose D, Ghosh D, Girigoswami A, Das P, Chattopadhyay N. Photophysics and Rotational Dynamics of a β-Carboline Analogue in Nonionic Micelles: Effect of Variation of Length of the Headgroup and the Tail of the Surfactant. J Phys Chem B 2009; 113:7517-26. [DOI: 10.1021/jp900575e] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Atanu Mahata
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Deboleena Sarkar
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Debosreeta Bose
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Debanjana Ghosh
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | | | - Paramita Das
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
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25
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Andrade-Dias C, Lima S, Teixeira-Dias JJC, Teixeira J. Why Do Methylated and Unsubstituted Cyclodextrins Interact So Differently with Sodium Decanoate Micelles in Water? J Phys Chem B 2008; 112:15327-32. [DOI: 10.1021/jp807167h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cristiano Andrade-Dias
- CICECO, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal, and Laboratoire Léon Brillouin (UMR12 CEA-CNRS), Saclay, France
| | - Sérgio Lima
- CICECO, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal, and Laboratoire Léon Brillouin (UMR12 CEA-CNRS), Saclay, France
| | - José J. C. Teixeira-Dias
- CICECO, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal, and Laboratoire Léon Brillouin (UMR12 CEA-CNRS), Saclay, France
| | - José Teixeira
- CICECO, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal, and Laboratoire Léon Brillouin (UMR12 CEA-CNRS), Saclay, France
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26
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Organero JA, Martin C, Cohen B, Douhal A. Chemical and biological caging effects on the relaxation of a proton-transfer dye. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:10352-10357. [PMID: 18702475 DOI: 10.1021/la801256h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report studies of the interaction between a proton-transfer dye (1'-hydroxy,2'-acetonaphthone, HAN), with the human serum albumin (HSA) protein and a beta-cyclodextrin derivative (DM-beta-CD) in neutral water solutions. We used steady-state and picosecond time-resolved emission spectroscopy to follow the structural changes of HAN due to the hydrophobicity and confinement effect of these nanocavities. Upon encapsulation, the fluorescence intensity of the 1:1 inclusion complex in both cavities increases, and the emission lifetimes become longer. For the DM-beta-CD complexes, we obtained 430 and 920 ps, whereas for the HSA complexes we obtained 630 ps and 2 ns. Picosecond anisotropy measurements show strong confinement due to protein docking. The rotational time for the CD complex is 660 ps, whereas for the protein complex we find 6 ns. The process of energy transfer from the excited triptophan 214 (Trp214) of HSA to the trapped HAN occurs with high efficiency (71%), and the calculated distance between both chromophores is 17 A. We believe that the results are important for a better understanding of the processes occurring in inclusion complexes such as those in nanopharmacodynamics.
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Affiliation(s)
- Juan Angel Organero
- Departamento de Química Física, Sección de Químicas, Facultad del Medio Ambiente, Universidad de Castilla La Mancha, Avenida Carlos III, S.N., Campus Tecnológico de Toledo, Toledo, Spain
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27
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Rodriguez J, Martí J, Guàrdia E, Laria D. Exploring the Picosecond Time Domain of the Solvation Dynamics of Coumarin 153 within β-Cyclodextrins. J Phys Chem B 2008; 112:8990-8. [DOI: 10.1021/jp8023765] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Javier Rodriguez
- Departamento de Física, Comisión Nacional de Energia Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina, Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departament de Fısica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B4-B5 Campus Nord 08034, Barcelona, Spain
| | - Jordi Martí
- Departamento de Física, Comisión Nacional de Energia Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina, Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departament de Fısica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B4-B5 Campus Nord 08034, Barcelona, Spain
| | - Elvira Guàrdia
- Departamento de Física, Comisión Nacional de Energia Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina, Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departament de Fısica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B4-B5 Campus Nord 08034, Barcelona, Spain
| | - Daniel Laria
- Departamento de Física, Comisión Nacional de Energia Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina, Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departament de Fısica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B4-B5 Campus Nord 08034, Barcelona, Spain
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28
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Das P, Sarkar D, Chattopadhyay N. Photophysics of a β-carboline based non-ionic probe in anionic and zwitterionic liposome membranes. Chem Phys Lipids 2008; 154:38-45. [DOI: 10.1016/j.chemphyslip.2008.03.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2007] [Revised: 02/27/2008] [Accepted: 03/03/2008] [Indexed: 10/22/2022]
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29
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Rodriguez J, Hernán Rico D, Domenianni L, Laria D. Confinement of Polar Solvents within β-Cyclodextrins. J Phys Chem B 2008; 112:7522-9. [DOI: 10.1021/jp711609q] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Javier Rodriguez
- Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departamento de Física, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina
| | - Daniel Hernán Rico
- Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departamento de Física, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina
| | - Luis Domenianni
- Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departamento de Física, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina
| | - Daniel Laria
- Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departamento de Física, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina
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30
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Ghanadzadeh A, Zeini A, Kashef A, Moghadam M. Concentration effect on the absorption spectra of oxazine1 and methylene blue in aqueous and alcoholic solutions. J Mol Liq 2008. [DOI: 10.1016/j.molliq.2007.09.005] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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31
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Kornievskaya VS, Kruppa AI, Polyakov NE, Leshina TV. Effect of glycyrrhizic acid on lappaconitine phototransformation. J Phys Chem B 2007; 111:11447-52. [PMID: 17824688 DOI: 10.1021/jp0739770] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
1H NMR and CIDNP methods were used to demonstrate that triterpene glycoside (glycyrrhizic acid, GA) can substantially change the efficiency and direction of phototransformation of alkaloid lappaconitine (LA) due to both its solubilization in GA micelles and protonation of LA amine nitrogen in water-alcohol solutions. The LA solubilization in the GA micelle suppresses the process of deacylation.
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Affiliation(s)
- Valeria S Kornievskaya
- Institute of Chemical Kinetics and Combustion, Institutskaya str. 3, Novosibirsk, 630090, Russia.
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32
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Das P, Chakrabarty A, Haldar B, Mallick A, Chattopadhyay N. Effect of cyclodextrin nanocavity confinement on the photophysics of a beta-carboline analogue: a spectroscopic study. J Phys Chem B 2007; 111:7401-8. [PMID: 17530799 DOI: 10.1021/jp072142m] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Interaction of a beta-carboline based biologically active molecule, 3-acetyl-4-oxo-6,7-dihydro-12H indolo-[2,3-a] quinolizine (AODIQ), with alpha-, beta-, and gamma-cyclodextrins (CDs) in aqueous solution has been studied using steady state and time-resolved fluorescence and steady-state fluorescence anisotropy techniques. Polarity dependent intramolecular charge transfer (ICT) process is responsible for the remarkable sensitivity of this biological fluorophore to the CD environments. Upon encapsulation, the CT fluorescence exhibits hypsochromic shift along with enhancements in the fluorescence yield, fluorescence anisotropy (r), and fluorescence lifetime. The reduction in the nonradiative deactivation rate of the fluorophore within the CD nanocavities leads to an increase in both fluorescence yield and lifetime. Among the three CDs, gamma-CD shows the most spectacular confinement effect. The results establish the formation of 1:1 AODIQ:CD inclusion complexes in alpha- and beta-CDs. In aqueous gamma-CD solutions, however, depending on the concentration of the gamma-CD, formation of both 1:1 and 1:2 complexes have been revealed. Hydrodynamic radii of the 1:1 and 1:2 probe-gamma-CD supramolecular complexes have also been determined.
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Affiliation(s)
- Paramita Das
- Department of Chemistry, Jadavpur University, Calcutta, India
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33
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Mondal SK, Sahu K, Ghosh S, Sen P, Bhattacharyya K. Excited-State Proton Transfer from Pyranine to Acetate in γ-Cyclodextrin and Hydroxypropyl γ-Cyclodextrin. J Phys Chem A 2006; 110:13646-52. [PMID: 17181316 DOI: 10.1021/jp063436v] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Excited-state proton transfer (ESPT) from pyranine (8-hydroxypyrene-1,3,6-trisulfonate, HPTS) to acetate has been studied by picosecond and femtosecond emission spectroscopy in gamma-cyclodextrin (gamma-CD) and 2-hydroxypropyl-gamma-cyclodextrin (HP-gamma-CD) cavities. In both the CDs, ESPT from HPTS to acetate is found to be very much slower (90 and 200 ps) than that in bulk water (0.15 and 6 ps). From molecular modeling, it is shown that in the cyclodextrin cavity the acetate is separated from the OH group of HPTS by water bridges. As a result, proton transfer in the cavity requires rearrangement of the hydrogen-bond network involving the cyclodextrin. This is responsible for the marked slowdown of ESPT. ESPT of HPTS in substituted gamma-CD is found to be slower than that in the unsubstituted one. This is attributed to the hydroxypropyl groups, which prevent close approach of acetate to HPTS.
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Affiliation(s)
- Sudip Kumar Mondal
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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34
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Nishikawa S, Kondo M. Kinetic Study for the Inclusion Complex of Carboxylic Acids with Cyclodextrin by the Ultrasonic Relaxation Method. J Phys Chem B 2006; 110:26143-7. [PMID: 17181269 DOI: 10.1021/jp068081u] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ultrasonic absorption coefficients in the frequency range of 0.8-95 MHz were measured in aqueous solutions containing both beta-cyclodextrin (beta-CD) (host) and butanoic acid (in its dissociated form and undissociated one) (guest). A single relaxational phenomenon was observed only when the solutes were coexisting, although no relaxation was found in the beta-CD solution or in the acid solutions. The absorption was also measured in a solution of pentanoic acid (dissociated form) with beta-CD, and single relaxation was detected. The ultrasonic relaxation observed in these solutions was due to a perturbation of a chemical equilibrium related to a reaction of an inclusion complex formed by the host and guest. The equilibrium constant was obtained from the dependence of the maximum absorption per wavelength on the guest concentration. The rate constant for the inclusion process of the guest into a cavity of beta-CD and that for the leaving process from the cavity were determined from the obtained relaxation frequency and the equilibrium constant. The standard volume change of the reaction was also computed from the maximum absorption per wavelength. These results were compared with those in solutions containing both beta-CD and different guest molecules. It was found that the hydrophobicity of guest molecules played an important role in the formation of the inclusion complex and also that the charge on the carboxylic group had a considerable effect on the kinetic characteristics of the complexation reaction.
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Affiliation(s)
- Sadakatsu Nishikawa
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Saga, 840-8502, Japan. nishikas@ cc.saga-u.ac.jp
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35
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Ghosh S, Mondal SK, Sahu K, Bhattacharyya K. Ultrafast Electron Transfer in a Nanocavity. Dimethylaniline to Coumarin Dyes in Hydroxypropyl γ-Cyclodextrin. J Phys Chem A 2006; 110:13139-44. [PMID: 17149826 DOI: 10.1021/jp064412r] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Photoinduced electron transfer (PET) from N,N-dimethylaniline (DMA) to four coumarin dyes (C151, C481, C153, and C480) inside the cavity of hydroxypropyl gamma-cyclodextrin (hpCD) is studied using femtosecond upconversion. The rate of PET is found to be nonexponential and to vary significantly with the coumarin dyes. The rate for C481 is 100 times faster than that for C480. The PET rate displays a bell-shaped dependence on the free energy change and thus reveals a Marcus-type inverted region. The anisotropy decay of the four dyes in hpCD are found to be very similar, and hence the observed variation in the rate of PET is not due to variation in rotational diffusion of the acceptors (coumarin dyes).
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Affiliation(s)
- Subhadip Ghosh
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata - 700 032, India
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36
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Pistolis G, Balomenou I. Cyclodextrin Cavity Size Effect on the Complexation and Rotational Dynamics of the Laser Dye 2,5-Diphenyl-1,3,4-oxadiazole: From Singly Occupied Complexes to Their Nanotubular Self-Assemblies. J Phys Chem B 2006; 110:16428-38. [PMID: 16913774 DOI: 10.1021/jp062003p] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The general complexation scheme as well as the dynamic features of the supramolecular structures resulting from the interaction of the laser dye 2,5-diphenyl-1,3,4-oxadiazole (PPD) with the naturally occurring alpha-, beta-, and gamma-cyclodextrins in water are studied by means of fluorescence spectroscopy, both steady-state (SS) and time-resolved (TR). PPD interacts weakly, from a thermodynamic point of view, with alpha-cyclodextrin (alpha-CD), forming 1:1 complexes with an association constant of K(11) = 85 +/- 4 M(-1). However, the local motion of the substrate (PPD) with respect to the ligand (CD) in the complexed form is hindered; namely, dynamically, they are strongly coupled and only a global tumbling motion, = 370 +/- 30 ps, of the whole adduct is observed. The next homologue beta-CD also forms 1:1 entities with PPD, but although the binding strength of reactants (K(11) = 682 +/- 60 M(-1)) is almost an order of magnitude greater than the former case with the alpha-CD, these are dynamically weakly coupled. In fact, two independent motions are detected: one is that of the whole nanostructure motion (1:1, PPD/beta-CD) with a global rotational relaxation time of = 480 +/- 30 ps, and the other is an internal librational motion of the dye inside the host cavity with an average angular displacement of theta approximately 27 degrees . Finally, the interaction of PPD with the wider and more flexible cavity of the gamma-CD "triggers" a self-associative scheme of the initially formed supramolecular building blocks, namely, singly occupied complexes, leading to the formation of nanotubular superstructures. It is found that these linear arrays are constituted from more than 17 gamma-CD units which are held together with the aid of dimers of PPD. Interestingly, our results supported that two distinct dimeric forms of PPD play the role of the "shaft" between adjacent cyclodextrin units. The topology of the dimers in the interlinking space of gamma-CD units is such that PPD molecules are held in suitable proximity, resulting, upon excitation, in the observation of dual excimer emission.
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Affiliation(s)
- George Pistolis
- NCSR Demokritos Institute of Physical Chemistry, 153 10 Athens, Greece.
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Chakraborty A, Seth D, Chakrabarty D, Sarkar N. Photoinduced intermolecular electron transfer from dimethyl aniline to 7-amino coumarin dyes in the surface of beta-cyclodextrin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 64:801-8. [PMID: 16458585 DOI: 10.1016/j.saa.2005.08.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2005] [Revised: 07/15/2005] [Accepted: 08/16/2005] [Indexed: 05/06/2023]
Abstract
The photoinduced electron-transfer reaction between Coumarin dyes and N,N-dimethylaniline has been investigated using steady-state and Time-resolved fluorescence spectroscopy in the surface of beta-cyclodextrin in dimethyl formamide (DMF) solvent. The electron-transfer rate constant has been correlated with the free-energy change during the process. We have observed a diffusion-controlled ET process in pure DMF by showing a normal Marcus region. However, the picture is different in presence of cyclodextrin. Here the ET is retarded at higher free-energy region. This unusual feature in bimolecular electron-transfer reaction is assumed to be arising from the different binding possibility of the Coumarin molecules to the cyclodextrin moity.
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Affiliation(s)
- Anjan Chakraborty
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, West Bengal, India
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38
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Affiliation(s)
- Gerhard Wenz
- Organische Makromolekulare Chemie, Saarland University, Geb. C4.2, D-66123 Saarbrücken, Germany.
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Sen P, Roy D, Mondal SK, Sahu K, Ghosh S, Bhattacharyya K. Fluorescence Anisotropy Decay and Solvation Dynamics in a Nanocavity: Coumarin 153 in Methyl β-Cyclodextrins. J Phys Chem A 2005; 109:9716-22. [PMID: 16833284 DOI: 10.1021/jp051607a] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Fluorescence anisotropy decay and solvation dynamics of coumarin 153 (C153) are studied in dimethyl beta-cyclodextrin (DIMEB) and trimethyl beta-cyclodextrin (TRIMEB) nanocavity in water. C153 binds to DIMEB and TRIMEB to form both 1:1 and 1:2 (C153:cyclodextrin) complexes. The anisotropy decays of C153 in DIMEB and TRIMEB are found to be biexponential. The fast component of anisotropy decay (approximately 1000 ps) is attributed to the 1:1 complex and the slower one (approximately 2500 ps) to the 1:2 complex. From the components of the anisotropy decay, the length of the 1:1 and 1:2 complexes are estimated. Solvation dynamics of C153 in DIMEB exhibits a very fast (2.4 ps) component (41%) and two slower components of 50 ps (29%) and 1450 ps (30%). Solvation dynamics in TRIMEB is described by three slow components of 10.3 ps (24%), 240 ps (45%), and 2450 ps (31%). Possible origins of the ultraslow components are discussed.
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Affiliation(s)
- Pratik Sen
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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40
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Theoretical Investigations and Mechanisms of the Inclusion Processes of bi(3-sulfonatophenyl) (4-tert-butylphenyl) phosphine in the β-cyclodextrin. J INCL PHENOM MACRO 2005. [DOI: 10.1007/s10847-005-1762-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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41
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Tormo L, Organero JA, Douhal A. Effect of Nanocavity Confinement on the Relaxation of Anesthetic Analogues: Relevance to Encapsulated Drug Photochemistry. J Phys Chem B 2005; 109:17848-54. [PMID: 16853289 DOI: 10.1021/jp0512457] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report on UV-vis absorption and picosecond emission studies of methyl 2-amino-4,5-dimethoxy benzoate in neutral water and complexed to alpha-, beta-, and gamma-cyclodextrin (CD). Upon encapsulation, the emission intensity and the fluorescence lifetime increase, indicating a hydrophobic effect of the nanocages on the photophysical behavior of the guest. beta-CD confinement shows the largest effect. The time-dependent frequency shift of the emission (approximately 720 cm(-1)) in beta-CD nanocavity is larger than the one observed in water (approximately 490 cm(-1)) due to the hydrophobic and polarity effect of the nanocage and reflects a strengthening of the intramolecular H-bond of the encapsulated dye upon electronic excitation. Anisotropy measurements indicate a free motion of the guest into the nanocavity. The observed results are relevant to the hydrophobic as well as hydrophilic interactions which govern photochemistry and photophysics of caged drugs, organic, and biological systems.
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Affiliation(s)
- Laura Tormo
- Departamento de Química Física, Sección de Químicas, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avda. Carlos III, S.N., 45071, Toledo, Spain
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Roy D, Mondal SK, Sahu K, Ghosh S, Sen P, Bhattacharyya K. Temperature Dependence of Anisotropy Decay and Solvation Dynamics of Coumarin 153 in γ-Cyclodextrin Aggregates. J Phys Chem A 2005; 109:7359-64. [PMID: 16834102 DOI: 10.1021/jp0520143] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Effect of temperature on the fluorescence anisotropy decay and the ultraslow component of solvation dynamics of coumarin 153 (C153) in a gamma-cyclodextrin (gamma-CD) nanocavity are studied using a picosecond set up. The steady-state anisotropy (0.13 +/- 0.01) and residual anisotropy (0.14 +/- 0.01) in fluorescence anisotropy decay in an aqueous solution containing 7 microM C153 and 40 mM gamma-CD are found to be quite large. This indicates formation of large linear nanotube aggregates of gamma-CD linked by C153. It is estimated that >53 gamma-CD units are present in each aggregate. In these aggregates with rise in temperature, the average solvation time (<tau(s)>(obs)) decreases markedly from 680 ps at 278 K to 160 ps at 318 K. The dynamic Stokes shift is found to decrease from 800 cm(-1) at 278 K to 250 cm(-1) at 318 K. The fraction of dynamic Stokes shift (f(d)) detected in a picosecond set up is calculated using the Fee-Maroncelli procedure. The corrected solvation time (<tau(s)>(corr) = f(d)<(tau(s)>(obs)) displays an Arrhenius type temperature dependence. From the temperature variation, the activation energy and entropy of the solvation process are determined to be 12.5 kcal M(-1) and 28 cal M(-1) K(-1), respectively. The ultraslow component and its temperature dependence are ascribed to a dynamic exchange between bound and free water molecules.
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Affiliation(s)
- Durba Roy
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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Hromadová M, Pospísil L, Fanelli N, Giannarelli S. Models of pesticides inside cavities of molecular dimensions. A role of the guest inclusion in the dechlorination process. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:1923-1930. [PMID: 15723490 DOI: 10.1021/la048021k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The reduction mechanism of the pesticide vinclozoline (3-(3,5-dichlorophenyl)-5-methyl-5-vinyl-1,3-oxazolidine-2,4-dione) was studied in nonaqueous solvents in the confined environment of a cyclodextrin (CD) cavity. The effect of the cavity dimensions on the mechanism of the redox process was evaluated using glucose as a reference and using three cyclodextrin molecules of different cavity sizes, namely, alphaCD, betaCD, and gammaCD. In the absence of CD the main reduction product of vinclozoline in the first reduction step is dichloroaniline. An addition of glucose leads to a quantitative change of mechanism with 10 products in total. Addition of CD, however, leads exclusively to dechlorination of the phenyl ring. The degree of dechlorination depends strongly on the choice of cyclodextrin molecule. The importance of the complex formation equilibria in the change of the mechanism is supported by a series of semiempirical AM1 quantum-mechanical calculations. Very good correlation (correlation coefficient 0.995) was obtained between the complex stabilization energy of the inclusion complex and the degree of pesticide dechlorination. Additionally, we were able to show that the complexes are stabilized by the formation of intermolecular hydrogen bonds between the host and guest species. CD molecules do not simply act as proton donors in a nonaqueous environment, but also protect parts of the molecule included within the cavity and steer the degradation process toward fewer products.
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Affiliation(s)
- Magdaléna Hromadová
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 18223 Prague, Czech Republic
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Kubinyi M, Vidóczy T, Varga O, Nagy K, Bitter I. Absorption and fluorescence spectroscopic study on complexation of Oxazine 1 Dye by calix[8]arenesulfonate. APPLIED SPECTROSCOPY 2005; 59:134-139. [PMID: 15720749 DOI: 10.1366/0003702052940477] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
It has been established by combined absorption and fluorescence measurements that the cationic dye Oxazine 1 (OX) and the polyvalent anionic host calix[8]arenesulfonate (SCA8) form two complexes in simultaneous reactions: OX + SCA8 <--> OX.SCA8 (1), and OX.SCA8 + OX <--> OX(2).SCA8 (2). The equilibrium constants for the two reactions, as functions of the ionic strength (I), and the absorption and fluorescence spectra of the two complex species have been determined by a least-squares fitting method from the experimental data. The variations of the binding constants with the ionic strength could be described on the basis of Debye-Huckel theory. The equilibrium constants are large; their values extrapolated to I = 0 are K(1) = 5.5 x 10(6) M(-1) and K(2) = 4.4 x 10(5) M(-1). The fluorescence of OX undergoes a strong static quenching upon complexation. These results indicate that the complexes are held together by strong electrostatic forces. The addition of non-fluorescent tetramethylammonium chloride to OX-SCA8 mixtures results in a dramatic fluorescent enhancement, which demonstrates the potential applicability of this supramolecular system in fluorescence assays.
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Affiliation(s)
- Miklós Kubinyi
- Department of Physical Chemistry, Budapest University of Technology and Economics, 1521 Budapest, Hungary.
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Tang B, Zhang L, Zhang J, Chen ZZ, Wang Y. Synthesis of a novel host molecule of cross-linking-polymeric-beta-cyclodextrin-o-vanillin furfuralhydrazone and spectrofluorimetric analysis of its identifying cadmium. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2004; 60:2425-2431. [PMID: 15249035 DOI: 10.1016/j.saa.2003.12.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2003] [Accepted: 12/11/2003] [Indexed: 05/24/2023]
Abstract
A novel host inclusion complex of cross-linking-polymeric-beta-cyclodextrin-o-vanillin furfuralhydrazone (beta-CDP-OVFH) was synthesized and characterized with IR and 1H NMR spectra to confirm its structure. The coordination reaction of the host reagent with Cd(2+) was studied and the optimum reacting conditions were observed carefully. A highly selective and sensitive spectrofluorimetric determination of trace amount of cadmium was proposed based on the reaction of Cd(2+) with beta-CDP-OVFH in ammonia water-ammonium acetate buffer medium of pH = 11.0. The molar ratio of beta-CDP-OVFH to Cd(2+) was 1:1. The maximum excitation and emission wavelengths were 393 and 494 nm, respectively. The linear range of this method was from 3.0 to 500 microg l(-1) with a detection limit of 0.80 microg l(-1). The effect of interferences in the determination of cadmium was investigated and the results showed that the host reagent had quite high capacity of identifying Cd(2+). The proposed method was successfully applied to the determination of trace amount of Cd(2+) in mussel and tea samples.
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Affiliation(s)
- Bo Tang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China.
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Hazra P, Chakrabarty D, Chakraborty A, Sarkar N. Intramolecular charge transfer and solvation dynamics of Nile Red in the nanocavity of cyclodextrins. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.02.078] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Affiliation(s)
- Abderrazzak Douhal
- Departamento de Química Física, Sección de Químicas, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N. 45071 Toledo, Spain.
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Petrova S, Kruppa A, Leshina T. Time-resolved photo-CIDNP of dibenzyl ketone-β-cyclodextrin inclusion complex. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2003.12.036] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Singh MK, Pal H, Koti ASR, Sapre AV. Photophysical Properties and Rotational Relaxation Dynamics of Neutral Red Bound to β-Cyclodextrin. J Phys Chem A 2004. [DOI: 10.1021/jp035075e] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. K. Singh
- Spectroscopy Division and Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India, and Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
| | - H. Pal
- Spectroscopy Division and Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India, and Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
| | - A. S. R. Koti
- Spectroscopy Division and Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India, and Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
| | - A. V. Sapre
- Spectroscopy Division and Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India, and Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
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