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Ghosh I, Mukhopadhyay A, Koner AL, Samanta S, Nau WM, Moorthy JN. Excited-state properties of fluorenones: influence of substituents, solvent and macrocyclic encapsulation. Phys Chem Chem Phys 2014; 16:16436-45. [DOI: 10.1039/c4cp01724b] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorescence and radiationless deactivation of methoxy-substituted fluorenones are strongly guided by location(s) of the substituent(s) in the fluorenone core.
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Affiliation(s)
| | - Arindam Mukhopadhyay
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016, India
| | | | - Subhas Samanta
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016, India
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2
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Gavvala K, Sasikala WD, Sengupta A, Dalvi SA, Mukherjee A, Hazra P. Modulation of excimer formation of 9-(dicyano-vinyl)julolidine by the macrocyclic hosts. Phys Chem Chem Phys 2013; 15:330-40. [DOI: 10.1039/c2cp43282j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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3
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Wagner BD. Hydrogen bonding of excited states in supramolecular host–guest inclusion complexes. Phys Chem Chem Phys 2012; 14:8825-35. [DOI: 10.1039/c2cp40310b] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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4
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Dsouza RN, Pischel U, Nau WM. Fluorescent dyes and their supramolecular host/guest complexes with macrocycles in aqueous solution. Chem Rev 2011; 111:7941-80. [PMID: 21981343 DOI: 10.1021/cr200213s] [Citation(s) in RCA: 805] [Impact Index Per Article: 61.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Roy N Dsouza
- School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany
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5
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Koivunen JT, Nissinen L, Käpylä J, Jokinen J, Pihlavisto M, Marjamäki A, Heino J, Huuskonen J, Pentikäinen OT. Fluorescent Small Molecule Probe to Modulate and Explore α2β1 Integrin Function. J Am Chem Soc 2011; 133:14558-61. [DOI: 10.1021/ja206086c] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
| | | | - Jarmo Käpylä
- Department of Biochemistry and Food Chemistry, University of Turku, Finland
| | - Johanna Jokinen
- Department of Biochemistry and Food Chemistry, University of Turku, Finland
| | | | | | - Jyrki Heino
- Department of Biochemistry and Food Chemistry, University of Turku, Finland
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6
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Abstract
The complexation dynamics of the triplet excited state of xanthone with β-cyclodextrin were studied at various temperatures between 10 and 50 °C. Association and dissociation rate constants were determined using the laser flash photolysis quenching methodology with Cu2+ as a quencher. The rate constants for the association and dissociation of triplet xanthone with β-cyclodextrin increased with temperature, while the equilibrium constant for the triplet excited state remained relatively constant. Equilibrium constants for the ground-state complexation of xanthone with β-cyclodextrin were determined from fluorescence studies at various temperatures. The ground-state binding efficiency decreased with temperature and was markedly greater than that of the triplet excited state at all temperatures. The enthalpy and entropy for the β-cyclodextrin complex formation of the ground and triplet excited states fall on the enthalpy–entropy compensation relationship previously established for cyclodextrin complexes. The activation enthalpies for the association and dissociation rate constants for triplet xanthone are similar. The activation entropy is favorable for the association process, whereas a negative activation entropy was measured for the dissociation process, suggesting that solvation plays a key role in the complex formation between xanthone and β-cyclodextrin.
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Affiliation(s)
- Tamara C. S. Pace
- Department of Chemistry, University of Victoria, PO Box 3065, Victoria, BC V8W 3V6, Canada
| | - Cornelia Bohne
- Department of Chemistry, University of Victoria, PO Box 3065, Victoria, BC V8W 3V6, Canada
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7
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Hamai S. Inclusion of Methyl 2-Naphthalenecarboxylate and Dimethyl 2,3-, 2,6-, and 2,7-Naphthalenedicarboxylates by Cyclodextrins in Aqueous Solution. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2010. [DOI: 10.1246/bcsj.20100214] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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8
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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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9
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Han Y, Tuccio B, Lauricella R, Villamena FA. Improved spin trapping properties by beta-cyclodextrin-cyclic nitrone conjugate. J Org Chem 2008; 73:7108-17. [PMID: 18707169 DOI: 10.1021/jo8007176] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Spin trapping using a nitrone and electron paramagnetic resonance (EPR) spectroscopy is commonly employed in the identification of transient radicals in chemical and biological systems. There has also been a growing interest in the pharmacological activity of nitrones, and there is, therefore, a pressing need to develop nitrones with improved spin trapping properties and controlled delivery in cellular systems. The beta-cyclodextrin (beta-CD)-cyclic nitrone conjugate, 5-N-beta-cyclodextrin-carboxamide-5-methyl-1-pyrroline N-oxide (CDNMPO) was synthesized and characterized. 1-D and 2-D NMR show two stereoisomeric forms (i.e., 5S- and 5R-) for CDNMPO. Spin trapping using CDNMPO shows distinctive EPR spectra for superoxide radical anion (O2(*-)) compared to other biologically relevant free radicals. Kinetic analysis of O2(*-) adduct formation and decay using singular value decomposition and pseudoinverse deconvolution methods gave an average bimolecular rate constant of k = 58 +/- 1 M(-1) s(-1) and a maximum half-life of t(1/2) = 27.5 min at pH 7.0. Molecular modeling was used to rationalize the long-range coupling between the nitrone and the beta-CD, as well as the stability of the O2(*-) adducts. This study demonstrates how a computational approach can aid in the design of spin traps with a relatively high rate of reactivity to O2(*-), and how beta-CD can improve adduct stability via intramolecular interaction with the O2(*-) adduct.
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Affiliation(s)
- Yongbin Han
- Department of Pharmacology, The Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, Ohio 43210, USA
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10
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Comparative Study of the Inclusion Complexation of Pizotifen and Ketotifen with Native and Modified Cyclodextrins. J SOLUTION CHEM 2007. [DOI: 10.1007/s10953-007-9234-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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11
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Guzzo MR, Uemi M, Donate PM, Nikolaou S, Machado AEH, Okano LT. Study of the complexation of fisetin with cyclodextrins. J Phys Chem A 2007; 110:10545-51. [PMID: 16956235 DOI: 10.1021/jp0613337] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this work, the interaction between fisetin (3,3',4',7-tetrahydroxyflavone) (Fis) and cyclodextrins (CDs) (alpha and beta) was studied through UV-vis absorption, steady-state fluorescence, induced circular dichroism, and (1)H NMR experiments with dependence on temperature and pH. Some experimental data were compared with quantum-mechanics studies based on the SAM1 (AMPAC) semiempirical model, as well as with the B3LYP and MPW1PW91 functional models from density functional theory using the 6-311G and 3-21G basis sets. The spectroscopic measurements show that Fis does not form stable complexes with alpha-CD. On the other hand, at pH 4.0 and 6.5, the complex Fis-beta-CD is formed in a Fis:beta-CD 1:1 stoichiometry and an equilibrium constant (K) of 900 +/- 100 M(-1). In basic medium (pH 11.5), K decreases to 240 +/- 90 M(-1) because Fis deprotonation leads to its better solubilization in water. Molecular modeling points out that Fis is not totally inserted into the inner cavity of beta-CD. The formation of the inclusion complex renders an environment that enhances intramolecular excited state proton transfer. The inclusion complex is formed preferentially via entry of the Fis phenyl group into beta-CD.
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Affiliation(s)
- Mariana R Guzzo
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901 Ribeirão Preto, SP, Brazil
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12
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Murphy RS, Bohne C. Use of Styrene Radical Cations as Probes for the Complexation Dynamics of Charged Guests with α- and β-Cyclodextrins. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2000)0710035uosrca2.0.co2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Sebök-Nagy K, Biczók L, Morimoto A, Shimada T, Inoue H. Energy Dissipation Processes of singlet-excited 1-Hydroxyfluorenone and its Hydrogen-bonded Complex with N-methylimidazole¶. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2004.tb00059.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Bohne C. Supramolecular dynamics studied using photophysics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:9100-11. [PMID: 17042517 DOI: 10.1021/la061227w] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Dynamics is an essential feature of supramolecular systems, and it's understanding will be central in achieving new chemical function. The methodology to obtain association and dissociation rate constants for fast binding of guests to host systems in real time is described. Examples are provided for binding of guests to cyclodextrins or bile salt aggregates with an emphasis on the type of information and mechanistic insight that can only be uncovered from kinetic studies and is not apparent in thermodynamic investigations.
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Affiliation(s)
- Cornelia Bohne
- Department of Chemistry, University of Victoria, PO Box 3065, Victoria, British Columbia, Canada.
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15
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Neugebauer J, Baerends EJ. Exploring the Ability of Frozen-Density Embedding to Model Induced Circular Dichroism. J Phys Chem A 2006; 110:8786-96. [PMID: 16836441 DOI: 10.1021/jp0622280] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
In this study, we present calculations of the circular dichroism (CD) spectra of complexes between achiral and chiral molecules. Nonzero rotational strengths for transitions of the nonchiral molecule are induced by interactions between the two molecules, which cause electronic and/or structural perturbations of the achiral molecule. We investigate if the chiral molecule (environment) can be represented only in terms of its frozen electron density, which is used to generate an effective embedding potential. The accuracy of these calculations is assessed in comparison to full supermolecular calculations. We can show that electronic effects arising from specific interactions between the two subsystems can reliably be modeled by the frozen-density representation of the chiral molecule. This is demonstrated for complexes of 2-benzoylbenzoic acid with (-)-(R)-amphetamine and for a nonchiral, artificial amino acid receptor system consisting of ferrocenecarboxylic acid bound to a crown ether, for which a complex with l-leucine is studied. Especially in the latter case, where multiple binding sites and interactions between receptor and target molecule exist, the frozen-density results compare very well with the full supermolecular calculation. We also study systems in which a cyclodextrin cavity serves as a chiral host system for a small, achiral molecule. Problems arise in that case because of the importance of excitonic couplings with excitations in the host system. The frozen-density embedding cannot describe such couplings but can only capture the direct effect of the host electron density on the electronic structure of the guest. If couplings play a role, frozen-density embedding can at best only partially describe the induced circular dichroism. To illustrate this problem, we finally construct a case in which excitonic coupling effects are much stronger than direct interactions of the subsystem densities. The frozen density embedding is then completely unsuitable.
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Affiliation(s)
- Johannes Neugebauer
- Theoretical Chemistry, Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands.
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16
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Spectroscopic properties of cyclophane/anthracene and cyclophane/9-fluorenone complexes in dichloromethane. Microchem J 2005. [DOI: 10.1016/j.microc.2004.09.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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18
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19
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A circular dichroism and structural study of the inclusion complex artemisinin-β-cyclodextrin. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2003.11.084] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Sebok-Nagy K, Biczók L, Morimoto A, Shimada T, Inoue H. Energy Dissipation Processes of Singlet-excited 1-Hydroxyfluorenone and its Hydrogen-bonded Complex with N-methylimidazole¶. Photochem Photobiol 2004; 80:119-26. [PMID: 15339210 DOI: 10.1562/2004-01-27ra-067.1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Effects of solvent, pH and hydrogen bonding with N-methylimidazole (MIm) on the photophysical properties of 1-hydroxyfluorenone (1HOF) have been studied. Fluorescence lifetime, fluorescence quantum yield and triplet yield measurements demonstrated that intersystem crossing was the dominant process in apolar media and its rate constant significantly diminished with increasing solvent polarity. The acceleration of internal conversion in alcohols paralleled the strength of intermolecular hydrogen bonding. The faster energy dissipation from the singlet-excited state in cyclohexane was attributed to intramolecular hydrogen bonding. The pK(a) of 1HOF decreased from 10.06 to 5.0 on light absorption, and H(3)O(+) quenched the singlet-excited molecules in a practically diffusion-controlled reaction. On addition of MIm in toluene, dual fluorescence was observed, which was attributed to reversible formation of excited hydrogen-bonded ion pair. Rate constants for the various deactivation pathways were derived from the combined analysis of the steady-state and the time-resolved fluorescence results.
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Affiliation(s)
- Krisztina Sebok-Nagy
- Chemical Research Center, Hungarian Academy of Sciences, Pusztaszeri út 59-67, 1025 Budapest, Hungary
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21
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Naka K, Sato H, Fujita T, Iyi N, Yamagishi A. Induction of Circular Dichroism by Coadsorption of Chiral and Achiral Metal Complexes on a Colloidal Clay. J Phys Chem B 2003. [DOI: 10.1021/jp022412v] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kazunari Naka
- Department of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higasi-Hiroshima 739-8526, Japan, Graduate School of Science, Department of Earth and Planetary Science, The University of Tokyo, Hongo, Tokyo 113-0033, Japan, CREST, Japan Science and Technology Corporation, Japan, and Aist, Tsukuba, Ibaraki 305-8561, Japan
| | - Hisako Sato
- Department of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higasi-Hiroshima 739-8526, Japan, Graduate School of Science, Department of Earth and Planetary Science, The University of Tokyo, Hongo, Tokyo 113-0033, Japan, CREST, Japan Science and Technology Corporation, Japan, and Aist, Tsukuba, Ibaraki 305-8561, Japan
| | - Taketoshi Fujita
- Department of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higasi-Hiroshima 739-8526, Japan, Graduate School of Science, Department of Earth and Planetary Science, The University of Tokyo, Hongo, Tokyo 113-0033, Japan, CREST, Japan Science and Technology Corporation, Japan, and Aist, Tsukuba, Ibaraki 305-8561, Japan
| | - Nobuo Iyi
- Department of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higasi-Hiroshima 739-8526, Japan, Graduate School of Science, Department of Earth and Planetary Science, The University of Tokyo, Hongo, Tokyo 113-0033, Japan, CREST, Japan Science and Technology Corporation, Japan, and Aist, Tsukuba, Ibaraki 305-8561, Japan
| | - Akihiko Yamagishi
- Department of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higasi-Hiroshima 739-8526, Japan, Graduate School of Science, Department of Earth and Planetary Science, The University of Tokyo, Hongo, Tokyo 113-0033, Japan, CREST, Japan Science and Technology Corporation, Japan, and Aist, Tsukuba, Ibaraki 305-8561, Japan
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22
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Sheepwash MAL, Ward TR, Wang Y, Bandyopadhyay S, Mitchell RH, Bohne C. Mechanistic studies on the photochromism of [e]-annelated dimethyldihydropyrenes. Photochem Photobiol Sci 2003; 2:104-12. [PMID: 12664969 DOI: 10.1039/b208952a] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photochemistry of several photochromic arene [e]-annelated dimethyldihydropyrenes (DHPs) was studied. These compounds have much larger photochemical ring opening quantum yields than the simple DHPs, making them potentially more useful as building blocks for photoswitchable materials.
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Affiliation(s)
- Molina A L Sheepwash
- University of Victoria, Department of Chemistry, PO Box 3065, Victoria, B.C., Canada, V8W 3V6
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23
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α- and β-cyclodextrin complexes with n-alkyl carboxylic acids and n-alkyl p-hydroxy benzoates. A molecular mechanics study of 1:1 and 1:2 associations. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0166-1280(02)00393-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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24
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Sheepwash MAL, Mitchell RH, Bohne C. Mechanistic insights into the photochromism of trans-10b,10c-dimethyl-10b,10c-dihydropyrene derivatives. J Am Chem Soc 2002; 124:4693-700. [PMID: 11971718 DOI: 10.1021/ja017229e] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of dimethyldihydropyrene derivatives was studied to elucidate the photochemical mechanism associated with the switching between the dimethyldihydropyrene (DHP, closed) and metacyclophanediene (CPD, open) forms of the molecule. Quantum yields of ring opening and closure, fluorescence quantum yields and lifetimes, as well as laser flash photolysis studies were performed to establish the effect of substituents on the switching efficiency. Ring opening of the DHPs occurs from the first singlet excited state. The low quantum yields for the ring opening reaction observed (< or =0.042) are a consequence of the low rate constant (< or =1.7 x 10(7) s(-1)) for this process. The quantum yields for ring closure of the CPD were determined for select compounds and were of the order of 0.1-0.4. These results show that the efficiency for ring opening of this class of compounds is intrinsically low, but can be modulated to some extent by the introduction of substituents. These properties should be taken into account when considering what type of photoswitching devices DHPs might be useful for.
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Affiliation(s)
- Molina A L Sheepwash
- Contribution from the Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC, Canada V8W 3V6
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25
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Tanatani A, Hughes TS, Moore JS. Foldamers as Dynamic Receptors: Probing the Mechanism of Molecular Association between Helical Oligomers and Rodlike Ligands. Angew Chem Int Ed Engl 2002. [DOI: 10.1002/1521-3757(20020118)114:2<335::aid-ange335>3.0.co;2-m] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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26
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Oana M, Tintaru A, Gavriliu D, Maior O, Hillebrand M. Spectral Study and Molecular Modeling of the Inclusion Complexes of β-Cyclodextrin with Some Phenoxathiin Derivatives. J Phys Chem B 2001. [DOI: 10.1021/jp012198v] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Melania Oana
- Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bd. Regina Elisabeta, No. 4-12, Bucharest, Romania, Institute of Physical Chemistry “I. G. Murgulescu”, Splaiul Independentei, No. 202, 77208 Bucharest, Romania, and Department of Organic Chemistry, Faculty of Chemistry, University of Bucharest, Sos. Panduri, No. 90-92, Bucharest, Romania
| | - Aura Tintaru
- Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bd. Regina Elisabeta, No. 4-12, Bucharest, Romania, Institute of Physical Chemistry “I. G. Murgulescu”, Splaiul Independentei, No. 202, 77208 Bucharest, Romania, and Department of Organic Chemistry, Faculty of Chemistry, University of Bucharest, Sos. Panduri, No. 90-92, Bucharest, Romania
| | - Daniela Gavriliu
- Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bd. Regina Elisabeta, No. 4-12, Bucharest, Romania, Institute of Physical Chemistry “I. G. Murgulescu”, Splaiul Independentei, No. 202, 77208 Bucharest, Romania, and Department of Organic Chemistry, Faculty of Chemistry, University of Bucharest, Sos. Panduri, No. 90-92, Bucharest, Romania
| | - Ovidiu Maior
- Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bd. Regina Elisabeta, No. 4-12, Bucharest, Romania, Institute of Physical Chemistry “I. G. Murgulescu”, Splaiul Independentei, No. 202, 77208 Bucharest, Romania, and Department of Organic Chemistry, Faculty of Chemistry, University of Bucharest, Sos. Panduri, No. 90-92, Bucharest, Romania
| | - Mihaela Hillebrand
- Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bd. Regina Elisabeta, No. 4-12, Bucharest, Romania, Institute of Physical Chemistry “I. G. Murgulescu”, Splaiul Independentei, No. 202, 77208 Bucharest, Romania, and Department of Organic Chemistry, Faculty of Chemistry, University of Bucharest, Sos. Panduri, No. 90-92, Bucharest, Romania
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27
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Biczók L, Cser A, Nagy K. Substituent and solvent effects on the photophysical properties of 3-azafluorenone derivatives. J Photochem Photobiol A Chem 2001. [DOI: 10.1016/s1010-6030(01)00597-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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28
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Song KS, Hou CR, Liu L, Li XS, Guo QX. A quantum-chemical study on the molecular recognition of β-cyclodextrin with ground and excited xanthones. J Photochem Photobiol A Chem 2001. [DOI: 10.1016/s1010-6030(01)00385-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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29
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Tanatani A, Mio MJ, Moore JS. Chain length-dependent affinity of helical foldamers for a rodlike guest. J Am Chem Soc 2001; 123:1792-3. [PMID: 11456794 DOI: 10.1021/ja003678n] [Citation(s) in RCA: 176] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A Tanatani
- Roger Adams Laboratory, Department of Chemistry and Materials Science & Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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30
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Okano LT, Barros TC, Chou DTH, Bennet AJ, Bohne C. Complexation Dynamics of Xanthone and Thioxanthone to β-Cyclodextrin Derivatives. J Phys Chem B 2001. [DOI: 10.1021/jp002622c] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- L. T. Okano
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada, V8W 3V6, and Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
| | - T. C. Barros
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada, V8W 3V6, and Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
| | - D. T. H. Chou
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada, V8W 3V6, and Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
| | - A. J. Bennet
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada, V8W 3V6, and Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
| | - C. Bohne
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada, V8W 3V6, and Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
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Nazarov VB, Avakyan VG, Vershinnikova TG, Alfimov MV. Excimer fluorescence and structures of the inclusion complexes of β-cyclodextrin with naphthalene and its derivatives. Russ Chem Bull 2000. [DOI: 10.1007/bf02496337] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Christoff M, Okano L, Bohne C. Dynamics of complexation of flavone and chromone to β-cyclodextrin. J Photochem Photobiol A Chem 2000. [DOI: 10.1016/s1010-6030(00)00262-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Die Ausrichtung eines Chromophors in einem chiralen Wirtmolekül liefert einen empfindlichen Test für die Orientierungs-Intensitäts-Regel des induzierten Circulardichroismus. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/(sici)1521-3757(20000204)112:3<555::aid-ange555>3.0.co;2-f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Murphy RS, Bohne C. Use of styrene radical cations as probes for the complexation dynamics of charged guests with alpha- and beta-cyclodextrins. Photochem Photobiol 2000; 71:35-43. [PMID: 10649887 DOI: 10.1562/0031-8655(2000)071<0035:uosrca>2.0.co;2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The complexation dynamics of radical cations with cyclodextrins (CD) was studied using photophysical techniques. Radical cations of 4-vinylanisole and trans-anethole were formed within alpha- and beta-CD cavities by two-photon photolysis of the respective styrene precursors. Exit of the radical cations from alpha-CD complexes with 1: 1 and 1:2 (guest: CD) stoichiometries and beta-CD complexes with 1:1 stoichiometries occurred with lifetimes shorter than 100 ns. Most of the radical cations formed escape from the CD cavities, but a small portion do react with alpha-CD when this host is present in high concentrations.
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Affiliation(s)
- R S Murphy
- Department of Chemistry, University of Victoria, B.C., Canada
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Okano LT, Ovans R, Zunic V, Moorthy JN, Bohne C. Effect of cyclodextrin complexation on the photochemistry of the lignin model α-guaiacoxyacetoveratrone. CAN J CHEM 1999. [DOI: 10.1139/v99-137] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The photodecomposition of α-guaiacoxyacetoveratrone (GAV) in homogeneous solvents and in aqueous cyclodextrin solutions was studied by following the fluorescence emission of the photoproducts formed. The same qualitative behavior as previously observed for the photodegradation quantum yield measurements was reproduced in the fluorescence studies in dry or wet methanol and acetonitrile. The yield for GAV photodegradation in water is smaller than in the organic solvents. Complexation of GAV to β- and γ-cyclodextrins leads to an increase in the photodecomposition yield, especially during the early part of the photodecomposition kinetics. The transients formed in the photolysis of GAV in water are similar to those observed in acetonitrile, and the lifetime of triplet GAV in water is 130 ns. In addition, solvated electrons were formed when GAV was photolyzed in water. Complexation of GAV to cyclodextrins leads to an increase in the triplet yield compared to the radical yield and a moderate shortening of the triplet lifetime.Key words: α-guaiacoxyacetoveratrone, cyclodextrin, excited singlet states, excited triplet states, radicals.
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