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Waly SMA, Benniston AC, Harriman A. Deducing the conformational space for an octa-proline helix. Chem Sci 2024; 15:1657-1671. [PMID: 38303943 PMCID: PMC10829019 DOI: 10.1039/d3sc05287g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Accepted: 12/20/2023] [Indexed: 02/03/2024] Open
Abstract
A molecular dyad, PY-P8-PER, comprising a proline octamer sandwiched between pyrene and perylene terminals has been synthesized in order to address the dynamics of electronic energy transfer (EET) along the oligo-proline chain. A simple pyrene-based control compound equipped with a bis-proline attachment serves as a reference for spectroscopic studies. The N-H NMR signal at the terminal pyrene allows distinction between cis and trans amides and, although the crystal structure for the control has the trans conformation, temperature-dependent NMR studies provide clear evidence for trans/cis isomerisation in D6-DMSO. Polar solvents tend to stabilise the trans structure for the pyrene amide group, even for longer oligo-proline units. Circular dichroism shows that the proline spacer for PY-P8-PER exists mainly in the all-trans geometry in methanol. Preferential excitation of the pyrene chromophore is possible at wavelengths in the 320-350 nm range and, for the dyad, is followed by efficacious EET to the perylene emitter. The probability for intramolecular EET, obtained from analysis of steady-state spectroscopic data, is ca. 80-90% in solvents of disparate polarity. Comparison with the Förster critical distance suggests the terminals are ca. 18 Å apart. Time-resolved fluorescence spectroscopy, in conjunction with DFT calculations, indicates the dyad exists as a handful of conformers displaying a narrow range of EET rates. Optimisation of a distributive model allows accurate simulation of the EET dynamics in terms of reasonable structures based on isomerisation of certain amide groups.
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Affiliation(s)
- Sara M A Waly
- Molecular Photonics Laboratory, Bedson Building, School of Natural and Environmental Sciences, Newcastle University Newcastle upon Tyne NE1 7RU UK
| | - Andrew C Benniston
- Molecular Photonics Laboratory, Bedson Building, School of Natural and Environmental Sciences, Newcastle University Newcastle upon Tyne NE1 7RU UK
| | - Anthony Harriman
- Molecular Photonics Laboratory, Bedson Building, School of Natural and Environmental Sciences, Newcastle University Newcastle upon Tyne NE1 7RU UK
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Chuang J, Chang C, Chang YJ, Chou P, Wen Y, Liu C, Chou T, Chow TJ. Synthesis of rod‐shaped dipolar compounds for the study of long‐range electronic interactions. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202100205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jay Chuang
- Department of Chemistry Chinese Culture University Taipei Taiwan
| | - Chun‐Wei Chang
- Department of Chemistry and Biochemistry National Chung Cheng University Chiayi Taiwan
| | - Yuan Jay Chang
- Department of Chemistry Tunghai University Taichung Taiwan
| | - Po‐Ting Chou
- Department of Chemistry Chinese Culture University Taipei Taiwan
| | - Yuh‐Sheng Wen
- Institute of Chemistry Academia Sinica Taipei Taiwan
| | - Ching‐Yang Liu
- Department of Chemistry Chinese Culture University Taipei Taiwan
| | - Teh‐Chang Chou
- Department of Chemistry and Biochemistry National Chung Cheng University Chiayi Taiwan
| | - Tahsin J. Chow
- Department of Chemistry Tunghai University Taichung Taiwan
- Institute of Chemistry Academia Sinica Taipei Taiwan
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Hossein-Nejad H, Olaya-Castro A, Scholes GD. Phonon-mediated path-interference in electronic energy transfer. J Chem Phys 2012; 136:024112. [DOI: 10.1063/1.3675844] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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4
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Excited state energy distributions in stereo selective white light emission of 1,2-dibenzthiazolyl ethylene isomers. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.03.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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5
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On the effect of nuclear bridge modes on donor–acceptor electronic coupling in donor–bridge–acceptor molecules. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2008.12.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Wang SM, Yu ML, Ding J, Tung CH, Wu LZ. Photoinduced Triplet−Triplet Energy Transfer via the 2-Ureido-4[1H]-pyrimidinone Self-Complementary Quadruple Hydrogen-Bonded Module. J Phys Chem A 2008; 112:3865-9. [DOI: 10.1021/jp711807s] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Su-Min Wang
- Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, Technical Institute of Physics and Chemistry and Graduate University, the Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Mao-Lin Yu
- Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, Technical Institute of Physics and Chemistry and Graduate University, the Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Jie Ding
- Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, Technical Institute of Physics and Chemistry and Graduate University, the Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Chen-Ho Tung
- Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, Technical Institute of Physics and Chemistry and Graduate University, the Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Li-Zhu Wu
- Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, Technical Institute of Physics and Chemistry and Graduate University, the Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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Kuznetz O, Davis D, Salman H, Eichen Y, Speiser S. Intramolecular electronic energy transfer in rhodamine–azulene bichromophoric molecule. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2007.04.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Chou TC, Liao KC, Lin JJ. Synthesis and luminescence properties of U-shaped polycyclic molecules containing syn-facial functionalized quinoxaline rings. Org Lett 2006; 7:4843-6. [PMID: 16235903 DOI: 10.1021/ol051707z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] Rigid U-shaped molecules containing syn-facially situated quinoxaline rings have been synthesized in three steps, by a combination of the Diels-Alder reaction, the ruthenium-catalyzed oxidation, and the Zn(OAc)(2)-catalyzed condensation of the resulting bis-alpha-diketones with benzene-1,2-diamines. The unsymmetric bis-quinoxalines, with electronically different substituents, and the quinoxaline ring-attached alpha-diketones were also prepared. Their luminescence properties were examined and described.
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Affiliation(s)
- Teh-Chang Chou
- Department of Chemistry and Biochemistry, National Chung Cheng University, Minsyong, Chiayi, Taiwan.
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Xu XH, Fu XG, Wu LZ, Chen B, Zhang LP, Tung CH, Ji HF, Schanze KS, Zhang RQ. Intramolecular Triplet Energy Transfer in Donor–Acceptor Molecules Linked by a Crown Ether Bridge. Chemistry 2006; 12:5238-45. [PMID: 16607672 DOI: 10.1002/chem.200501151] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Bichromophoric compounds BP-C-NP and BP-C-NBD were synthesized with benzophenone chromophore (BP) as the donor, and 2-naphthyl (NP) and norbornadiene group (NBD) as the acceptor, respectively. Their intramolecular triplet energy transfer was examined. The bridges linking the donor and acceptors in these molecules involve a crown ether moiety complexing a sodium ion. Phosphorescence quenching, flash photolysis and photosensitized isomerization experiments indicate that intramolecular triplet energy transfer occurs with rate constants of about 3.3 x 10(5) and 4.8 x 10(5) s(-1) and efficiencies of about 33 and 42 % for BP-C-NP and BP-C-NBD, respectively. Theoretical calculations indicate that these molecules adopt conformations below room temperature which allow their two-end chromophores conducive to through-space energy transfer.
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Affiliation(s)
- Xiao-He Xu
- Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing 100101, PR China
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Salman H, Eichen Y, Speiser S. A molecular scale full adder based on controlled intramolecular electron and energy transfer. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2006. [DOI: 10.1016/j.msec.2005.09.071] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Bhattacharya S, Pradhan TK, De A, Chaudhury SR, De AK, Ganguly T. Photophysical Processes Involved within the Anisole−Thioindoxyl Dyad System. J Phys Chem A 2006; 110:5665-73. [PMID: 16640361 DOI: 10.1021/jp056556w] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The photophysical properties and the nature of the photoinduced electron transfer (PET) reactions within a synthesized anisole (A)-thioindoxyl (T) dyad system (24MBTO) have been studied by electrochemical, steady-state, and time-resolved spectroscopic techniques. Computations on the dyad were performed both in gas phase as well as solvent environment by TD-DFT method with B3LYP density function. The geometry optimization calculation of 24MBTO was done by 6-311G(d,p) basis function set implemented in the Gaussian package. The theoretical values of singlet vertical excitation energies were found to correlate well with the experimentally observed ones. The electrochemical measurements indicate the possibility of occurrence of PET reactions within 24MBTO between the linked redox centers A and T. Both steady-state and time-resolved spectroscopic measurements on the novel synthesized 24MBTO dyad demonstrate the formations of the two types of isomeric species: Z- and E- forms, resulted from the charge separation reactions. From the detailed studies it reveals that the present thioaurone may behave as a versatile photoswitchable system. It has been hinted that the loss process (charge recombination) within 24MBTO could possibly be prevented by incorporating it within the hydrophobic cavity of beta-cyclodextrin (betaCD).
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Affiliation(s)
- Sudeshna Bhattacharya
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, West Bengal
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Venturi M, Marchioni F, Ferrer Ribera B, Balzani V, Opris DM, Schlüter AD. Photoinduced Energy- and Electron-Transfer Processes in Dinuclear RuII-OsII, RuII-OsIII, and RuIII-OsII Trisbipyridine Complexes Containing a Shape-Persistent Macrocyclic Spacer. Chemphyschem 2006; 7:229-39. [PMID: 16404769 DOI: 10.1002/cphc.200500323] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The PF6- salt of the dinuclear [(bpy)2Ru(1)Os(bpy)2]4+ complex, where 1 is a phenylacetylene macrocycle which incorporates two 2,2'-bipyridine (bpy) chelating units in opposite sites of its shape-persistent structure, was prepared. In acetonitrile solution, the Ru- and Os-based units display their characteristic absorption spectra and electrochemical properties as in the parent homodinuclear compounds. The luminescence spectrum, however, shows that the emission band of the Ru(II) unit is almost completely quenched with concomitant sensitization of the emission of the Os(II) unit. Electronic energy transfer from the Ru(II) to the Os(II) unit takes place by two distinct processes (k(en) = 2.0x10(8) and 2.2x10(7) s(-1) at 298 K). Oxidation of the Os(II) unit of [(bpy)2Ru(1)Os(bpy)2]4+ by Ce(IV) or nitric acid leads quantitatively to the [(bpy)2Ru(II)(1)Os(III)(bpy)2]5+ complex which exhibits a bpy-to-Os(III) charge-transfer band at 720 nm (epsilon(max) = 250 M(-1) cm(-1)). Light excitation of the Ru(II) unit of [(bpy)2Ru(II)(1)Os(III)(bpy)2]5+ is followed by electron transfer from the Ru(II) to the Os(III) unit (k(el,f) = 1.6x10(8) and 2.7x10(7) s(-1)), resulting in the transient formation of the [(bpy)2Ru(III)(1)Os(II)(bpy)2]5+ complex. The latter species relaxes to the [(bpy)2Ru(II)(1)Os(III)(bpy)2]5+ one by back electron transfer (k(el,b) = 9.1x10(7) and 1.2x10(7) s(-1)). The biexponential decays of the [(bpy)2*Ru(II)(1)Os(II)(bpy)2]4+, [(bpy)2*Ru(II)(1)Os(III)(bpy)2]5+, and [(bpy)2Ru(III)(1)Os(II)(bpy)2]5+ species are related to the presence of two conformers, as expected because of the steric hindrance between hydrogen atoms of the pyridine and phenyl rings. Comparison of the results obtained with those previously reported for other Ru-Os polypyridine complexes shows that the macrocyclic ligand 1 is a relatively poor conducting bridge.
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Affiliation(s)
- Margherita Venturi
- Università di Bologna, Dipartimento di Chimica G. Ciamician via Selmi 2, I-40126 Bologna, Italy.
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14
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Abu-Hilu M, Peskin U. Promotion of deep tunneling through molecular barriers by electronic-nuclear coupling. J Chem Phys 2005; 122:021103. [PMID: 15638565 DOI: 10.1063/1.1846673] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Deep electronic tunneling through molecular barriers in donor-bridge-acceptor complexes is studied using an analytically solvable model. The effective tunneling matrix element is formulated as a sum over vibronic tunneling pathways. For a symmetric system the frequency of tunneling oscillations is shown to increase with the strength of electronic-nuclear coupling at the bridge, the number of electronic-nuclear coupling sites, or the frequency of a bridge vibration. Acceleration by several orders of magnitude is demonstrated within the range of realistic molecular parameters.
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Affiliation(s)
- Musa Abu-Hilu
- Department of Chemistry and The Lise Meitner Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
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15
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Pal SK, Sahu T, Misra T, Mallick PK, Paddon-Row MN, Ganguly T. Experimental Investigation by Laser Flash Photolysis To Reveal the Optical and Electron-Donating Properties of Benzothiazole Derivatives and a Theoretical Approach by Using Time-Dependent Density Functional Theory. J Phys Chem A 2004. [DOI: 10.1021/jp047445k] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. K. Pal
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India, Department of Physics, University of Burdwan, Burdwan-713 104, India, and School of Chemistry, University of New South Wales, Sydney, NSW2052, Australia
| | - T. Sahu
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India, Department of Physics, University of Burdwan, Burdwan-713 104, India, and School of Chemistry, University of New South Wales, Sydney, NSW2052, Australia
| | - T. Misra
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India, Department of Physics, University of Burdwan, Burdwan-713 104, India, and School of Chemistry, University of New South Wales, Sydney, NSW2052, Australia
| | - P. K. Mallick
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India, Department of Physics, University of Burdwan, Burdwan-713 104, India, and School of Chemistry, University of New South Wales, Sydney, NSW2052, Australia
| | - M. N. Paddon-Row
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India, Department of Physics, University of Burdwan, Burdwan-713 104, India, and School of Chemistry, University of New South Wales, Sydney, NSW2052, Australia
| | - T. Ganguly
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India, Department of Physics, University of Burdwan, Burdwan-713 104, India, and School of Chemistry, University of New South Wales, Sydney, NSW2052, Australia
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Bhattacharya T, Pal SK, Misra T, Saini RD, Ganguly T. Primary electron-transfer dynamics in 2-phenylindole-9-cyanoanthracene system. A comparative study with 2-methylindole. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2004; 60:1957-1966. [PMID: 15248973 DOI: 10.1016/j.saa.2003.10.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2003] [Revised: 10/14/2003] [Accepted: 10/14/2003] [Indexed: 05/24/2023]
Abstract
Electrochemical measurements by cyclic voltammetry predict the possibility of occurrence of photoinduced electron-transfer (PET) reactions between the ground state of 2-phenylindole (2PI) (electron donor) and the excited singlet of 9-cyanoanthracene (9CNA) molecule acting as an electron acceptor. However, 2PI should be expected to behave as a relatively weaker electron donating agent than the structurally related donor 2-methylindole (2MI) as it possesses higher oxidation potential value. Both steady-state and time-resolved spectroscopic measurements in the polar acetonitrile (ACN) and ethanol (EtOH) solvents show that the fluorescence quenching phenomenon of 9CNA in presence of 2PI is primarily due to the involvement of dynamic process which in high probability should be PET. Nevertheless, in less polar tetrahydrofuran (THF) medium, the quenching of 9CNA results from the combined effect of dynamic and static modes. The transient absorption spectra, measured by using nanosecond laser flash photolysis, of 9CNA in presence of 2PI exhibit the signature of the bands of the anionic species of 9CNA, cation of the donor 2PI and the contact neutral radical. Observations of the transient absorption at the different delays infer that ion-recombination mechanism is responsible for production of the monomeric triplets of both 9CNA and 2PI. From the transient absorption decays in ACN medium, it has been demonstrated that the diffusional separation of ions from geminate ion-pair is facilitated in the case of 2MI-9CNA pair whereas for 2PI-9CNA system the energy wasting charge recombination dominates over the process of charge dissociation. From the above observations, the possibility of developing much potential photosynthetic model compounds with the donor 2MI, rather than with the other donor 2PI molecule has been hinted.
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Affiliation(s)
- T Bhattacharya
- Department of Spectroscopy, Indian Association for the Cultivation of Science, 2A B. Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India
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Roué S, Lapinte C, Bataille T. Organometallic Mixed-Valence Systems. Electronic Coupling through an Alkyndiyl Bridge Incorporating Methylene Groups. Organometallics 2004. [DOI: 10.1021/om034359i] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Séverine Roué
- Organométalliques et Catalyse: Chimie et Electrochimie Moléculaire, UMR CNRS 6509, Institut de Chimie de Rennes, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes, France
| | - Claude Lapinte
- Organométalliques et Catalyse: Chimie et Electrochimie Moléculaire, UMR CNRS 6509, Institut de Chimie de Rennes, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes, France
| | - Thierry Bataille
- Laboratoire de Chimie du Solide et Inorganique Moléculaire, UMR CNRS 6511, Institut de Chimie de Rennes, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes, France
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Imahori H, Kashiwagi Y, Endo Y, Hanada T, Nishimura Y, Yamazaki I, Araki Y, Ito O, Fukuzumi S. Structure and photophysical properties of porphyrin-modified metal nanoclusters with different chain lengths. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:73-81. [PMID: 15745002 DOI: 10.1021/la035435p] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Three-dimensional porphyrin-monolayer-protected gold clusters with different chain lengths (MPCs) have been prepared to examine the structure and photophysical properties, in comparison with self-assembled monolayers (SAMs) of the porphyrins on a flat gold surface. The three-dimensional porphyrin MPCs exhibit electrochemical and photophysical properties that are much closer to those of a porphyrin reference compound in solution than those of two-dimensional porphyrin SAMs on the flat gold surface. The three-dimensional architectures of porphyrin MPCs with large surface area have improved the light-harvesting efficiency relative to the corresponding porphyrin SAM on the two-dimensional flat gold surface. Time-resolved single photon counting fluorescence and transient absorption spectroscopic studies have demonstrated that undesirable quenching of the porphyrin excited singlet state via energy transfer to the gold surface of the three-dimensional MPCs is much suppressed, as compared to the quenching of the porphyrin SAMs on the two-dimensional flat gold surface. Both the quenching rate constants of the porphyrin excited singlet state by the surfaces of bulk gold and gold nanoclusters reveal weak chain length dependence of the energy transfer quenching.
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Affiliation(s)
- Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, PRESTO, Japan Science and Technology Agency (JST), Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
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Abu-Hilu M, Peskin U. Modulations of electronic tunneling rates through flexible molecular bridges by a dissipative superexchange mechanism. Chem Phys 2004. [DOI: 10.1016/j.chemphys.2003.09.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Pischel U, Huang F, Nau WM. Intramolecular singlet–singlet energy transfer in antenna-substituted azoalkanes. Photochem Photobiol Sci 2004; 3:305-10. [PMID: 14993948 DOI: 10.1039/b311416c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two novel azoalkane bichromophores and related model compounds have been synthesised and photophysically characterised. Dimethylphenylsiloxy (DPSO) or dimethylnaphthylsiloxy (DNSO) serve as aromatic donor groups (antenna) and the azoalkane 2,3-diazabicyclo[2.2.2]oct-2-ene (DBO) as the acceptor. The UV spectral window of DBO (250-300 nm) allows selective excitation of the donor. Intramolecular singlet-singlet energy transfer to DBO is highly efficient and proceeds with quantum yields of 0.76 with DPSO and 0.99 with DNSO. The photophysical and spectral properties of the bichromophoric systems suggest that energy transfer occurs through diffusional approach of the donor and acceptor within a van der Waals contact at which the exchange mechanism is presumed to dominate. Furthermore, akin to the behaviour of electron-transfer systems in the Marcus inverted region, a rate of energy transfer 2.5 times slower was observed for the system with the more favourable energetics, i.e. singlet-singlet energy transfer from DPSO proceeded slower than from DNSO, although the process is more exergonic for DPSO (-142 kJ mol(-1) for DPSO versus-67 kJ mol(-1) for DNSO).
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Affiliation(s)
- Uwe Pischel
- REQUIMTE/Department of Chemistry, Faculty of Sciences, University of Porto, R. Campo Alegre, 4169-007 Porto, Portugal
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Photoinduced electron transfer reaction tuned by donor–acceptor pairs via the rigid, linear spacer heptacyclo[6.6.0.02,6.03,13.04,11.05,9.010,14]tetradecane. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00881-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Zhang LP, Chen B, Wu LZ, Tung CH, Cao H, Tanimoto Y. Remote Activation of the Quadricyclane Group in a Quadricyclane−Steroid−{Dibenzoylmethanatoboron Difluoride} System by Intramolecular Electron Transfer. J Phys Chem A 2003. [DOI: 10.1021/jp026918p] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
The current state of understanding of molecular resonance energy transfer (RET) and recent developments in the field are reviewed. The development of more general theoretical approaches has uncovered some new principles underlying RET processes. This review brings many of these important new concepts together into a generalization of Förster's original theory. The conclusions of studies investigating the various approximations in Förster theory are summarized. Areas of present and future activity are discussed. The review covers Förster theory for donor-acceptor pairs and electronic coupling for singlet-singlet, triplet-triplet, and superexchange-mediated energy transfer. This includes the transition density picture of Coulombic coupling as well as electronic coupling between molecular aggregates (excitons). Spectral overlaps and ensemble energy transfer rates in disordered aggregates, the role of dielectric properties of the medium, weak versus strong coupling, and new models for energy transfer in complex molecular assemblies are also described.
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Affiliation(s)
- Gregory D Scholes
- Lash-Miller Chemical Laboratories, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6 Canada.
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Chen KY, Chow TJ, Chou PT, Cheng YM, Tsai SH. Photoinduced electron transfer reactions across rigid linear spacer groups of high symmetry. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01917-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Remacle F, Weinkauf R, Steinitz D, Kompa K, Levine R. Molecular logic by optical spectroscopy with output transfer by charge migration along a peptide. Chem Phys 2002. [DOI: 10.1016/s0301-0104(02)00448-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Smith TA, Lokan N, Cabral N, Davies SR, Paddon-Row MN, Ghiggino KP. Photophysics of novel donor–{saturated rigid hydrocarbon bridge}–acceptor systems exhibiting efficient excitation energy transfer. J Photochem Photobiol A Chem 2002. [DOI: 10.1016/s1010-6030(02)00003-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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28
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Affiliation(s)
- F. Remacle
- The Fritz Haber Research Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Département de Chimie, B6, Université de Liège, B4000 Liège, Belgium, Department of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel, and Department of Chemistry and Biochemistry, The University of California Los Angeles, Los Angeles, California 90095
| | - Shammai Speiser
- The Fritz Haber Research Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Département de Chimie, B6, Université de Liège, B4000 Liège, Belgium, Department of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel, and Department of Chemistry and Biochemistry, The University of California Los Angeles, Los Angeles, California 90095
| | - R. D. Levine
- The Fritz Haber Research Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Département de Chimie, B6, Université de Liège, B4000 Liège, Belgium, Department of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel, and Department of Chemistry and Biochemistry, The University of California Los Angeles, Los Angeles, California 90095
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Chiou NR, Chow TJ, Chen CY, Hsu MA, Chen HC. Heptacyclo[6.6.0.0 2,6 .0 3,13 .0 4,11 .0 5,9 .0 10,14 ]tetradecane: a new type of spacer for mediating electron transfer processes. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(00)01869-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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30
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Peskin U. Analysis of a dissipative resonant tunneling trap by temperature-dependent Langevin–Schrödinger equations. J Chem Phys 2000. [DOI: 10.1063/1.1313387] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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31
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Time-resolved analysis of intramolecular electronic energy transfer in methylenes-linked naphthalene–anthracene compounds. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)00485-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Yeow EKL, Ghiggino KP. Electronic Energy Transfer in Multichromophoric Arrays. The Effects of Disorder on Superexchange Coupling and Energy Transfer Rate. J Phys Chem A 2000. [DOI: 10.1021/jp994218n] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Edwin K. L. Yeow
- Photophysics Laboratory, School of Chemistry, The University of Melbourne, Parkville, Victoria 3052, Australia
| | - Kenneth P. Ghiggino
- Photophysics Laboratory, School of Chemistry, The University of Melbourne, Parkville, Victoria 3052, Australia
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