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Testing Molecular Wires

Testing Molecular Wires

Mateusz Wielopolski

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Editorial:
Springer Nature B.V.
Año de edición:
2013
Materia
Química física
ISBN:
9783642265792
68,33 €
IVA incluido
Disponible

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I. Introduction and Motivation 11. Introduction to Molecular Electronics 21.1. Present Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.2. Limitations of Present Technology . . . . . . . . . . . . . . . . . . . . . . . . . . 72. Motivation - Focusing on Molecular Wires 9II. Theoretical Concepts 113. Concepts of Photoinduced Electron and Energy Transfer Processes AcrossMolecular Bridges 123.1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123.2. Electron TransferMechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143.2.1. Superexchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173.2.2. Charge Hopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223.2.3. Interplay ofMechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . 243.3. Electronic Energy Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253.3.1. Coulombic Energy Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . 263.3.2. Exchange Energy Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 274. Molecule-Assisted Transport of Charges and Energy Across Donor-Wire-Acceptor Junctions 304.1. Mechanisms of Charge Transfer throughMolecularWires . . . . . . . . . . . . 324.1.1. Superexchange Charge Transfer inMolecularWires . . . . . . . . . . . . 334.1.2. Sequential Charge Transfer inMolecularWires . . . . . . . . . . . . . . 344.2. Factors that Determine the Charge TransferMechanism . . . . . . . . . . . . . 364.2.1. Electronic Coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364.2.2. EnergyMatching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374.3. Specific Aspects of Photoinduced Electron Transfer in Organic ?-conjugatedSystems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394.3.1. Background . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . 404.3.2. The ClassicalMarcus Theory . . . . . . . . . . . . . . . . . . . . . . . . . 414.3.3. Photoexcitation and Relaxation Processes in Solution . . . . . . . . . . 454.3.3.1. Photoabsorption . . . . . . . . . . . . . . . . . . . . . . . . . . . 454.3.3.2. The Franck Condon Principle and Radiative Transitions . . . . 494.3.3.3. The Franck Condon Principle and Radiationless Transitions . 524.3.3.4. Relaxation Processes Following Photoexcitation . . . . . . . . 554.3.3.5. Characterization by Stationary Spectroscopy . . . . . . . . . . 574.3.3.6. Characterization by Time-Resolved Spectroscopy . . . . . . . 584.3.3.7. Internal Conversion . . . . . . . . . . . . . . . . . . . . . . . . . 584.3.4. Influence of the Solvation on the Electronic Relaxation Dynamics . . . 594.3.4.1. Static Solvent Influence . . . . . . . . . . . . . . . . . . . . . . . 604.3.4.2. Dynamic Solvent Influence . . . . . . . . . . . . . . . . . . . . . 615. Examples of Molecular Wire Systems 635.1. Oligo(phenylenevinylene)s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 645.2. Oligophenylenes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 655.3. Oligo(thiophene) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 675.4. PhotonicWires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69III.Results and Discussion 706. Objective 717. Instruments and Methods 797.1. Photophysics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 797.1.1. Absorption spectroscopy . . . . . . . . . . . . . . . . . . . . . . . . . . . 797.1.2. Steady-state emission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 797.1.3. Time-resolved emission . . . . . . . . . . . . . . . . . . . . . . . . . . . . 797.1.4. Femtosecond transient absorption spectroscopy . . . . . . . . . . . . . 807.1.5. Nanosecond laser Flash Photolysis . . . . . . . . . . . . . .

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Otros libros del autor

  • Testing Molecular Wires
    Mateusz Wielopolski
    One of the major challenges in current chemistry is to ?nd molecules able to move charges rapidly and ef?ciently from, for example, one terminus to another one under the control of an external electrical, electrochemical or photochemical stimulus. Nature has provided impressive examples of how these goals are achieved. The photosynthetic reaction cent...