1
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Adsorption of nitrogenous inhibitor molecules on MoS2 and CoMoS hydrodesulfurization catalysts particles investigated by scanning tunneling microscopy. J Catal 2019. [DOI: 10.1016/j.jcat.2018.12.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2
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Bourikas K, Kordulis C, Lycourghiotis A. Titanium Dioxide (Anatase and Rutile): Surface Chemistry, Liquid–Solid Interface Chemistry, and Scientific Synthesis of Supported Catalysts. Chem Rev 2014; 114:9754-823. [DOI: 10.1021/cr300230q] [Citation(s) in RCA: 230] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Kyriakos Bourikas
- School
of Science and Technology, Hellenic Open University, Tsamadou
13-15, GR-26222 Patras, Greece
| | - Christos Kordulis
- Department
of Chemistry, University of Patras, GR-26500 Patras, Greece
- Institute of Chemical Engineering and High-Temperature Chemical Processes (FORTH/ICE-HT), P.O. Box 1414, GR-26500 Patras, Greece
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3
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Pang CL, Lindsay R, Thornton G. Structure of clean and adsorbate-covered single-crystal rutile TiO2 surfaces. Chem Rev 2013; 113:3887-948. [PMID: 23676004 DOI: 10.1021/cr300409r] [Citation(s) in RCA: 264] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Chi Lun Pang
- London Centre for Nanotechnology and Department of Chemistry, University College London, London WC1H 0AJ, United Kingdom
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4
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Vohs JM. Site requirements for the adsorption and reaction of oxygenates on metal oxide surfaces. Chem Rev 2012. [PMID: 23181433 DOI: 10.1021/cr300328u] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- John M Vohs
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
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5
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Busiakiewicz A, Klusek Z, Rogala M, Dabrowski P, Kowalczyk PJ, Datta PK. The new high-temperature surface structure on reduced TiO2(001). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:395501. [PMID: 21403230 DOI: 10.1088/0953-8984/22/39/395501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Scanning tunnelling microscopy, ultraviolet photoelectron spectroscopy and current imaging tunnelling spectroscopy (STM/UPS/CITS) were used to study the topographic and electronic structure of a high-temperature structure formed on the TiO(2)(001) surface after heating at 1173 K. The STM images revealed different domain-like ordering and periodicity on the surface in comparison to those observed previously. The UPS studies showed the presence of a surface state at energy about 1.1 eV below the Fermi level. This result was confirmed by the CITS data showing pronounced periodic maxima of the electron local density of states at energy around 1.1-1.2 eV below the Fermi level and located on top of every row of the new high-temperature structure. The CITS results recorded for small grains, which coexist with the observed structure, showed that their chemical composition is closer to the Ti(2)O(3) material than to TiO(2-x) for x << 1.
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Affiliation(s)
- A Busiakiewicz
- Division of Physics and Technology of Nanometre Structures, Department of Solid State Physics, University of Lodz, 90-236 Lodz, Pomorska 149/153, Poland.
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6
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Tero R, Ujihara T, Urisu T. Lipid bilayer membrane with atomic step structure: supported bilayer on a step-and-terrace TiO2(100) surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:11567-11576. [PMID: 18785710 DOI: 10.1021/la801080f] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The formation of a supported planar lipid bilayer (SPLB) and its morphology on step-and-terrace rutile TiO 2(100) surfaces were investigated by fluorescence microscopy and atomic force microscopy. The TiO 2(100) surfaces consisting of atomic steps and flat terraces were formed on a rutile TiO 2 single-crystal wafer by a wet treatment and annealing under a flow of oxygen. An intact vesicular layer formed on the TiO 2(100) surface when the surface was incubated in a sonicated vesicle suspension under the condition that a full-coverage SPLB forms on SiO 2, as reported in previous studies. However, a full-coverage, continuous, fluid SPLB was obtained on the step-and-terrace TiO 2(100) depending on the lipid concentration, incubation time, and vesicle size. The SPLB on the TiO 2(100) also has step-and-terrace morphology following the substrate structure precisely even though the SPLB is in the fluid phase and an approximately 1-nm-thick water layer exists between the SPLB and the substrate. This membrane distortion on the atomic scale affects the phase-separation structure of a binary bilayer of micrometer order. The interaction energy calculated including DLVO and non-DLVO factors shows that a lipid membrane on the TiO 2(100) gains 20 times more energy than on SiO 2. This specifically strong attraction on TiO 2 makes the fluid SPLB precisely follow the substrate structure of angstrom order.
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Affiliation(s)
- Ryugo Tero
- Division of Biomolecular Sensing, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan.
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7
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Lattice-work structure of a TiO2(001) surface studied by STM, core-level spectroscopies and DFT calculations. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.01.086] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Saab MA, Abdel-Malak R, Wishart JF, Ghaddar TH. Photocurrent generation in layer-by-layer assembled dendrimers with ruthenium tris-bipyridine peripheral groups and a viologen-like core. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:10807-15. [PMID: 17877379 DOI: 10.1021/la701574j] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The photophysical and photoelectrochemical properties of first- and second-generation dendrimers with ruthenium tris-bipyridine peripheral groups and a tri-viologen like core (Ru3V3 and Ru6V3) were investigated in solution and when embedded within assembled films. The stepwise assembly of these dendrimers on quartz and ITO surfaces utilizing the layer-by-layer approach was investigated. The amount of the assembled dendrimers was found to increase on going to the higher generation dendrimer. This dendrimer generation effect was evident from the UV-vis, atomic force microscopy, and electrochemical measurements of the dendrimers in either solution phase or when embedded in films. The anodic and cathodic photocurrent generation was seen upon visible light irradiation, with higher photocurrents for Ru6V3 than Ru3V3. This observation was attributed to better light-harvesting properties, thicker films, and slower charge recombination processes in Ru6V3 when compared to Ru3V3.
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Affiliation(s)
- Manal Abi Saab
- Department of Chemistry, American University of Beirut, Beirut 11-0236, Lebanon
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9
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Optimisation of accurate rutile TiO2 (110), (100), (101) and (001) surface models from periodic DFT calculations. Theor Chem Acc 2007. [DOI: 10.1007/s00214-006-0189-y] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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Imanishi A, Suzuki H, Murakoshi K, Nakato Y. Crystal-Face Dependence and Photoetching-Induced Increases of Dye-Sensitized Photocurrents at Single-Crystal Rutile TiO2 Surfaces. J Phys Chem B 2006; 110:21050-4. [PMID: 17048924 DOI: 10.1021/jp057538h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Dye-sensitized photocurrents at (100)-, (001)-, and (110)-cut TiO(2) rutile surfaces were increased by photoetching of TiO(2), but the increasing ratio strongly depended on the cut crystal faces and the illumination intensity for the photoetching. For the (110)-cut surface, the photocurrent increase was moderately large and in proportion to the increase in the surface area of TiO(2) induced by the photoetching, irrespective of the illumination intensity for the photoetching. On the other hand, the photocurrent increases for the (001)- and (100)-cut surfaces, especially that for the (001)-cut surface, were prominent and largely exceeded the increases in the surface area. The results were explained by taking into account the following factors: (1) The (001)- and (100)-cut surfaces were thermodynamically unstable in contrast to the (110)-cut surface and had thicker inactive surface layers (or higher densities of surface defects), produced by surface reconstruction during heat treatment of TiO(2) at 550 degrees C in a hydrogen atmosphere for getting n-type semiconductivity. (2) Photoetching not only increased the surface area through formation of nanoholes and grooves at the surface but also effectively removed the thin inactive surface layers (or surface defects).
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Affiliation(s)
- Akihito Imanishi
- Division of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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11
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Fukui KI, Sakai M. Formation of One-Dimensional C60 Rows on TiO2(110)-1 × 2-cross-link Structure and Their Local Polymerization. J Phys Chem B 2006; 110:21118-23. [PMID: 17048934 DOI: 10.1021/jp063305u] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Adsorption and growth of a C(60) monolayer on a TiO(2)(110)-1 x 2-cross-link structure were investigated by scanning tunneling microscopy (STM). Single C(60) molecules were preferentially anchored at the cross-link site due to interaction with undercoordinated Ti cations, and C(60) rows grew along the troughs between the 1 x 2-added rows. The C(60) monolayer structure is characterized by closely packed (r(C(60)-C(60)) = 1.0 nm) C(60) rows that are paired with every second added row (separation of paired rows is 1.1 nm). By applying a high negative bias voltage (-3.5 V) to an STM tip on the C(60) monolayer, C(60) oligomers were formed accompanied with the contraction of C(60)-C(60) distance along the C(60) row and bright contrast in the STM image.
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Affiliation(s)
- Ken-ichi Fukui
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Tokyo 152-8551, Japan.
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12
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Kubo T, Sayama K, Nozoye H. Microfaceting Explains Complicated Structures on Rutile TiO2 Surfaces. J Am Chem Soc 2006; 128:4074-8. [PMID: 16551116 DOI: 10.1021/ja0578808] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Surface structures on rutile TiO2 (001) have been studied by using scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and density functional calculations. Prior investigations have observed many kinds of complicated surface structures; however, detailed atomic structures and the mechanism of the reconstructions are still unknown. We evaluate the energetical stability of the surface structures. The calculational results suggest that a [111] microfaceting model is energetically stable compared with the unreconstructed (1 x 1) model. We propose microfaceting structural models that are in good agreement with atomically resolved STM images. This structural concept can be extended to other rutile TiO2 surfaces in general.
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Affiliation(s)
- Toshitaka Kubo
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5-2, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
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13
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Dossot M, Cremel S, Vandenborre J, Grausem J, Humbert B, Drot R, Simoni E. Sorption of uranyl cations on a rutile (001) single crystal monitored by surface second-harmonic generation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:140-7. [PMID: 16378412 DOI: 10.1021/la0519913] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The rotational anisotropy of second-harmonic generation at the surface of a (001) single-crystal rutile is obtained in the presence of uranyl cations sorbed at the surface from acidic solutions at various concentrations. Surface second-harmonic generation appears to be sensitive to the presence of uranyl cations on the rutile samples. Evolution of the anisotropy pattern with initial uranyl concentration is analyzed through a phenomenological model. The elements obtained for the nonlinear susceptibility tensor Chi(2) for each sample significantly constrain the geometry of the possible sorption complexes between uranyl cations and rutile and lead to the proposition of two sorption sites involving different oxygen atoms of the rutile surface.
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Affiliation(s)
- Manuel Dossot
- Laboratoire de Chimie Physique et Microbiologie pour l'Environnement LCPME, UMR CNRS-UHP 7564, F-54600 Villers-Les-Nancy, France.
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14
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Boubbou KH, Ghaddar TH. Electrostatic layer-by-layer deposition of photoactive dendrimers with triviologen-like cores on their surfaces. Synthesis and electrochemical and photocurrent generation measurements. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:8844-51. [PMID: 16142969 DOI: 10.1021/la051100r] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The stepwise assembly of Fréchet-type dendrimers with naphthalene peripheral groups and positively charged viologen-like cores on quartz and ITO surfaces utilizing the layer-by-layer approach was investigated. We were able to deposit only the (+6) charged dendrimers series on ITO. The number of assembled dendrimers was found to increase as we go to higher-generation dendrimers. This dendrimer generation effect was evident from the UV-vis and electrochemical measurements of the assembled dendrimers. The half-wave potentials (E1/2) of the dendrimers shift to less negative values as the dendrimer generation increases in acetonitrile and to more negative values when assembled on ITO. Anodic photocurrent generation was seen upon light irradiation of the second- and third-generation dendrimers, NB1V3+6 and NB2V3+6, assembled on ITO but not for the zero-generation one, NV3+6. This observation was attributed to a fast charge recombination process in NV3+6 when compared to that of NB1V3+6 and NB2V3+6 dendrimers.
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15
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De Schryver FC, Vosch T, Cotlet M, Van der Auweraer M, Müllen K, Hofkens J. Energy dissipation in multichromophoric single dendrimers. Acc Chem Res 2005; 38:514-22. [PMID: 16028885 DOI: 10.1021/ar040126r] [Citation(s) in RCA: 209] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Single-molecule spectroscopy of well-chosen dendritic multichromophoric systems allows investigation of fundamental photophysical processes such as energy or electron transfer in much greater detail than the respective ensemble measurements. In dendrimers with multiple chromophores, energy hopping and transfer to the chromophore with the energetically lowest S(1) state was observed. If more than one chromophore is in an excited state in one molecule, annihilation, either singlet-triplet or singlet-singlet, can occur. In the latter case, a higher singlet state is populated opening new deactivation pathways. In the presence of an electron donor, reversible electron transfer could be observed, and the rate constants of forward and backward electron transfer were established. The value of these rate constants fluctuates time-correlated with the rotational motion of the dendrimer arms and the mobility of the embedding matrix.
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Affiliation(s)
- F C De Schryver
- Department of Chemistry, KULeuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium.
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16
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Cotlet M, Vosch T, Habuchi S, Weil T, Müllen K, Hofkens J, De Schryver F. Probing Intramolecular Förster Resonance Energy Transfer in a Naphthaleneimide−Peryleneimide−Terrylenediimide-Based Dendrimer by Ensemble and Single-Molecule Fluorescence Spectroscopy. J Am Chem Soc 2005; 127:9760-8. [PMID: 15998080 DOI: 10.1021/ja042656o] [Citation(s) in RCA: 146] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report on the ensemble and single-molecule (SM) dynamics of Förster resonance energy transfer (FRET) in a multichromophoric rigid polyphenylenic dendrimer (triad) with spectrally different rylene chromophores featuring distinct absorption and emission spectra which cover the whole visible spectral range: a terrylenediimide (TDI) core, four perylenemonoimides (PMIs) attached at the scaffold, and eight naphthalenemonoimides (NMIs) at the rim. For FRET from PMI to TDI taking place with an efficiency of 99.5%, single triad molecules optically excited at 490 nm show fluorescence exclusively from the TDI side in the beginning of their emission. On 360-nm excitation, NMI chromophores transfer their excitation energy either directly or in a stepwise fashion to the core TDI, the latter case involving scaffold-substituted PMIs as intermediate acceptors. Indeed, SM experiments on 360-nm excitation evidence highly efficient FRET from NMI chromophores to the TDI core since individual triad molecules show fluorescence exclusively either from TDI or from an intermediate (oxidized) species but never from PMI. Because PMI and TDI are chromophores with high fluorescence quantum yields and high resistance to photobleaching compared to NMI, 360-nm excitation of a single triad molecule leads to bleaching of NMI chromophores with no chance for PMI to be observed. The spatial positioning and the spectral properties of the chosen rylene chromophores make this multichromophoric system an efficient light collector, able to capture light over the whole visible spectral range and to transfer it finally to the core TDI, the latter releasing it as red fluorescence.
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Affiliation(s)
- Mircea Cotlet
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, Heverlee B-3001, Belgium
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17
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Chao CC, Leung MK, Su YO, Chiu KY, Lin TH, Shieh SJ, Lin SC. Photophysical and Electrochemical Properties of 1,7-Diaryl-Substituted Perylene Diimides. J Org Chem 2005; 70:4323-31. [PMID: 15903307 DOI: 10.1021/jo050001f] [Citation(s) in RCA: 163] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Substituent effects on the photophysical and electrochemical properties of 1,7-diaryl-substituted perylene diimides (1,7-Ar(2)PDIs) have been carefully explored. Progressive red-shifts of the absorption and emission maxima were observed when the electron-donating ability of these substituents was increased. Linear Hammett correlations of 1/lambda(max) versus sigma(+) were observed in both spectral analyses. The positive slopes of the Hammett plots suggested that the electronic transitions carry certain amounts of photoinduced intramolecular charge-transfer (PICT) character from the aryl substituents to the perylene diimide core which leads to the reduction of the electron density on the substituents. The substituent electronic effects originated mainly from the perturbation of the core PDI HOMO energy level by the substituents. This conclusion was supported by PM3 analyses and confirmed by cyclic voltammetry experiments. More interestingly, the Ph(2)NC(6)H(4)-substituted PDI, 4i, showed an unusual dual-band absorption that spans from 450 to 750 nm. We tentatively assigned these two bands as the charge-transfer band and the PDI core absorption, respectively.
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Affiliation(s)
- Chun-Chieh Chao
- Department of Chemistry and Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan 106, ROC
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18
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Wang LQ, Ferris KF, Azad S, Engelhard MH. Adsorption and Reaction of Methanol on Stoichiometric and Defective SrTiO3(100) Surfaces. J Phys Chem B 2005; 109:4507-13. [PMID: 16851526 DOI: 10.1021/jp048338t] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The adsorption and reaction of methanol (CH(3)OH) on stoichiometric (TiO(2)-terminated) and reduced SrTiO(3)(100) surfaces have been investigated using temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), and first-principles density-functional calculations. Methanol adsorbs mostly nondissociatively on the stoichiometric SrTiO(3)(100) surface that contains predominately Ti(4+) cations. Desorption of a monolayer methanol from the stoichiometric surface is observed at approximately 250 K, whereas desorption of a multilayer methanol is found to occur at approximately 140 K. Theoretical calculations predict weak adsorption of methanol on TiO(2)-terminated SrTiO(3)(100) surfaces, in agreement with the experimental results. However, the reduced SrTiO(3)(100) surface containing Ti(3+) cations exhibits higher reactivity toward adsorbed methanol, and H(2), CH(4), and CO are the major decomposition products. The surface defects on the reduced SrTiO(3)(100) surface are partially reoxidized upon saturation exposure of CH(3)OH onto this surface at 300 K.
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Affiliation(s)
- Li-Qiong Wang
- Material Science Division and Environmental Molecular Science Laboratories, Pacific Northwest National Laboratory, Richland, Washington 99354, USA.
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19
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Métivier R, Kulzer F, Weil T, Müllen K, Basché T. Energy Transfer Rates and Pathways of Single Donor Chromophores in a Multichromophoric Dendrimer Built around a Central Acceptor Core. J Am Chem Soc 2004; 126:14364-5. [PMID: 15521750 DOI: 10.1021/ja047996o] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An artificial light-harvesting dendrimer showing highly efficient electronic excitation energy transfer from four peripheral donors to one central acceptor has been investigated by single-molecule spectroscopy at low temperatures. Confocal imaging in combination with frequency selective excitation spectroscopy gives direct access to energy transfer rates of individual donors and allows the determination of energy transfer pathways within a single multichromophoric aggregate.
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Affiliation(s)
- Rémi Métivier
- Institut für Physikalische Chemie, Johannes Gutenberg-Universität Mainz, Welderweg 11, 55099 Mainz, Germany
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20
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Uetsuka H, Henderson MA, Sasahara A, Onishi H. Formate Adsorption on the (111) Surface of Rutile TiO2. J Phys Chem B 2004. [DOI: 10.1021/jp049126z] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hiroshi Uetsuka
- Surface Chemistry Laboratory, Kanagawa Academy of Science and Technology, KSP, Sakado, Takatsu, Kawasaki, 213-0012 Japan, and Interfacial Chemistry and Engineering Group, Pacific Northwest National Laboratory, Richland, Washington 99352
| | - Michael A. Henderson
- Surface Chemistry Laboratory, Kanagawa Academy of Science and Technology, KSP, Sakado, Takatsu, Kawasaki, 213-0012 Japan, and Interfacial Chemistry and Engineering Group, Pacific Northwest National Laboratory, Richland, Washington 99352
| | - Akira Sasahara
- Surface Chemistry Laboratory, Kanagawa Academy of Science and Technology, KSP, Sakado, Takatsu, Kawasaki, 213-0012 Japan, and Interfacial Chemistry and Engineering Group, Pacific Northwest National Laboratory, Richland, Washington 99352
| | - Hiroshi Onishi
- Surface Chemistry Laboratory, Kanagawa Academy of Science and Technology, KSP, Sakado, Takatsu, Kawasaki, 213-0012 Japan, and Interfacial Chemistry and Engineering Group, Pacific Northwest National Laboratory, Richland, Washington 99352
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21
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Kaletaş BK, Dobrawa R, Sautter A, Würthner F, Zimine M, De Cola L, Williams RM. Photoinduced Electron and Energy Transfer Processes in a Bichromophoric Pyrene−Perylene Bisimide System. J Phys Chem A 2004. [DOI: 10.1021/jp0372688] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Başak Kükrer Kaletaş
- Molecular Photonic Materials, van 't Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Rainer Dobrawa
- Molecular Photonic Materials, van 't Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Armin Sautter
- Molecular Photonic Materials, van 't Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Frank Würthner
- Molecular Photonic Materials, van 't Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Mikhail Zimine
- Molecular Photonic Materials, van 't Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Luisa De Cola
- Molecular Photonic Materials, van 't Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - René M. Williams
- Molecular Photonic Materials, van 't Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
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22
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Wang LQ, Ferris KF, Azad S, Engelhard MH, Peden CHF. Adsorption and Reaction of Acetaldehyde on Stoichiometric and Defective SrTiO3(100) Surfaces. J Phys Chem B 2004. [DOI: 10.1021/jp030917v] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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23
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Cotlet M, Gronheid R, Habuchi S, Stefan A, Barbafina A, Müllen K, Hofkens J, De Schryver FC. Intramolecular Directional Förster Resonance Energy Transfer at the Single-Molecule Level in a Dendritic System. J Am Chem Soc 2003; 125:13609-17. [PMID: 14583059 DOI: 10.1021/ja036858g] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
We report on the directional Förster resonance energy transfer (FRET) process taking place in single molecules of a first (T1P4) and a second (T2P8) generation of a perylenemonoimide (P)-terrylenediimide (T)-based dendrimer in which the chromophores are separated by rigid polyphenylene arms. At low excitation powers, single-molecule detection and spectroscopy of T1P4 and T2P8 dendrimers point to a highly efficient directional FRET from P donors to the central T acceptor, optical excitation at 488 nm resulting in exclusively acceptor emission in the beginning of the detected fluorescence intensity. Donor emission is seen only upon the bleaching of the acceptor. High-resolution time-resolved single-molecule fluorescence data measured with a microchannel plate photomultiplier reveal, for T2P8, a broad range of FRET rates as a result of a broad range of distances and orientations experienced by the donor-acceptor dendrimers when immobilized in a polymer matrix. Single-molecule data from T2P8 on 488 nm excitation are indicative for the presence, after terrylenediimide bleaching, of a P-P excited dimer characterized by a broad emission spectrum peaking around 600 nm and by fluctuating fluorescence decay times. At high excitation powers, single T1P4 and T2P8 molecules display simultaneous emission from both donor and acceptor chromophores. The effect, called "exciton blockade", occurs due to the presence of multiple excitations in a single molecule.
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Affiliation(s)
- Mircea Cotlet
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, B-3001 Heverlee, Belgium
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