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Thanopulos I, Paspalakis E, Yannopapas V. Optical switching of electric charge transfer pathways in porphyrin: a light-controlled nanoscale current router. NANOTECHNOLOGY 2008; 19:445202. [PMID: 21832723 DOI: 10.1088/0957-4484/19/44/445202] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We introduce a novel molecular junction based on a thiol-functionalized porphyrin derivative with two almost energetically degenerate equilibrium configurations. We show that each equilibrium structure defines a pathway of maximal electric charge transfer through the molecular junction and that these two conduction pathways are spatially orthogonal. We further demonstrate computationally how to switch between the two equilibrium structures of the compound by coherent light. The optical switching mechanism is presented in the relevant configuration subspace of the compound, and the corresponding potential and electric dipole surfaces are obtained by ab initio methods. The laser-induced isomerization takes place in two steps in tandem, while each step is induced by a two-photon process. The effect of metallic electrodes on the electromagnetic irradiation driving the optical switching is also investigated. Our study demonstrates the potential for using thiol-functionalized porphyrin derivatives for the development of a light-controlled nanoscale current router.
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Affiliation(s)
- Ioannis Thanopulos
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Athens 11635, Greece
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Pradhan S, Ghosh D, Xu LP, Chen S. Interparticle Charge Transfer Mediated by π−π Stacking of Aromatic Moieties. J Am Chem Soc 2007; 129:10622-3. [PMID: 17696534 DOI: 10.1021/ja072597p] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Sulolit Pradhan
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, USA
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Remacle F, Levine RD. Electrical transport in saturated and conjugated molecular wires. Faraday Discuss 2006; 131:45-67; discussion 91-109. [PMID: 16512364 DOI: 10.1039/b505696a] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The mechanism for charge transport in dithio molecular wires tethered between two gold electrodes is investigated, using both a steady state and a time-dependent quantum mechanical approach. The interface with the electrodes is modeled by two gold clusters and the electronic structure of the entire Au(n)-S-bridge-S-Au(n) system is computed ab initio at the DFT level and semi-empirically, with the extended Hückel theory. Current vs. applied bias, I-V, curves are computed using a scattering Landauer-type formalism in a steady state picture. The applied source-drain and gate voltages are included at the ab initio level in the electronic Hamiltonian and found to influence strongly the I-V characteristics. The time evolution of a non stationary electronic wave packet initially localized on a gold atom at one end of the extended system shows that charge transfer proceeds sequentially, by a hopping mechanism, to the opposite end. Analysis of the effective one electron Hamiltonian matrix shows that the sulfur atom endows a resistive character to the Au-C-S junctions. The S atoms are however rather well coupled to both the gold and carbon atoms so that typically the super exchange limit for electron transfer is not reached unless the molecular bridge is saturated and the Fermi window function is narrow.
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Affiliation(s)
- F Remacle
- Département de Chimie, B6c, Université de Liège, B4000, Liège, Belgium.
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Affiliation(s)
- F. Remacle
- The Fritz Haber Research Center for Molecular Dynamics and Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Département de Chimie, B6c, Université de Liège, B4000 Liège, Belgium
| | - I. Willner
- The Fritz Haber Research Center for Molecular Dynamics and Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Département de Chimie, B6c, Université de Liège, B4000 Liège, Belgium
| | - R. D. Levine
- The Fritz Haber Research Center for Molecular Dynamics and Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Département de Chimie, B6c, Université de Liège, B4000 Liège, Belgium
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Remacle F, Beverly KC, Heath JR, Levine RD. Gating the Conductivity of Arrays of Metallic Quantum Dots. J Phys Chem B 2003. [DOI: 10.1021/jp036357h] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- F. Remacle
- The Fritz Haber Research Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Département de Chimie, B6c, Université de Liège, B4000 Liège, Belgium, Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, The Division of Chemistry and Chemical Engineering, California Institute of Technology, MC 127-72, Pasadena, California 91125
| | - K. C. Beverly
- The Fritz Haber Research Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Département de Chimie, B6c, Université de Liège, B4000 Liège, Belgium, Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, The Division of Chemistry and Chemical Engineering, California Institute of Technology, MC 127-72, Pasadena, California 91125
| | - J. R. Heath
- The Fritz Haber Research Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Département de Chimie, B6c, Université de Liège, B4000 Liège, Belgium, Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, The Division of Chemistry and Chemical Engineering, California Institute of Technology, MC 127-72, Pasadena, California 91125
| | - R. D. Levine
- The Fritz Haber Research Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Département de Chimie, B6c, Université de Liège, B4000 Liège, Belgium, Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, The Division of Chemistry and Chemical Engineering, California Institute of Technology, MC 127-72, Pasadena, California 91125
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