Electron-Phonon Interactions in Novel Nanoelectronics
In this book, the electron-phonon interactions in the charged molecular systems such as polyacenes, polyfluoroacenes, B, N-substituted polyacenes, and polycyanodienes are discussed. They estimated the electron-phonon coupling constants and the frequencies of the vibronic active modes playing an essential role in the electron-phonon interactions in order to discuss how CH-CF, CC-BN, and CC-CN substitutions are closely related to the essential characteristics of the electron-phonon interactions in these molecules by comparing the calculated results for charged polyacenes with those for charged B, N-substituted polyacenes and polycyanodienes, respectively. The C-C stretching modes around 1500 cm-1strongly couple to the highest occupied molecular orbitals (HOMO), and the lowest frequency modes and the C-C stretching modes around 1500 cm-1 strongly couple to the lowest unoccupied molecular orbitals (LUMO) in polyacenes. The C-C stretching modes around 1500 cm -1strongly couple to the HOMO and LUMO in polyfluoroacenes. The B-N stretching modes around 1500 cm -1 strongly couple to the HOMO and LUMO in B, N-substituted polyacenes. The C-C and C-N stretching modes around 1500 cm-1 strongly couple to the HOMO and LUMO in polycyanodienes. The total electron-phonon coupling constants for the monocations and monoanions decrease with an increase in molecular size in polyacenes, polyfluoroacenes, B, N-substituted polyacenes, and polycyanodienes. In general, we can expect that monocations and monoanions, in which number of carriers per atom is larger, affords larger value. The CH-CF, CC-BN, and CC-CN atomic substitutions are effective way to seek for larger values, and the CH-CF and CC-CN atomic substitutions are effective way to seek for larger values in polyacenes. The logarithmically averaged phonon frequencies which measure the frequencies of the vibronic active modes playing an essential role in the electron-phonon interactions for the monocations and monoanions in polyacenes, polyfluoroacenes, B, N-substituted polyacenes, and polycyanodienes are investigated. The values decrease with an increase in molecular size in polyacenes, polyfluoroacenes, and polycyanodienes, and the values decrease with an increase in molecular size in polyacenes, polyfluoroacenes, B, N-substituted polyacenes, and polycyanodienes. The authors can expect that in the hydrocarbon molecular systems, the values would basically decrease by substituting hydrogen atoms by heavier atoms. This can be understood from the fact that the frequencies of all vibronic active modes in polyacenes downshift by H-F substitution. However, considering that the value for the LUMO rather localised on carbon atoms in large sized polyfluoroacenes becomes larger by H-F substitution, the authors can expect that the value for a molecular orbital localised on carbon atoms has a possibility to increase by substituting hydrogen atoms by heavier atoms if the phase patterns of the molecular orbital do not significantly change by such atomic substitution. Therefore, the detailed properties of the vibrational modes and the electronic structures as well as the molecular weights are closely related to the frequencies of the vibronic active modes playing an important role in the electron-phonon interactions in the monoanions of polyfluoroacenes.
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ElectronPhonon Coupling Constants for the Charged Electronic States of Polyacenes Polyfluoroacenes B NSubstituted Polyacenes and Polycyanodien...
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3500 Frequency A\g mode active modes playing aln LUMO values antibonding interactions atomic orbitals b\g LUMO become weaker C-C stretching modes carbon and nitrogen carbon framework cm-1 can strongly cm-1 strongly couple conventional superconductors destabilized in energy displacements of carbon e\g HOMO e2u LUMO electron density electron-phonon coupling constants electron-phonon interactions electronegativity perturbation fluorine atoms Frequency cm-1 frontier orbitals H-F substitution HOMO and LUMO HOMO values increase in molecular intramolecular localized on carbon low frequency modes LUMO in 2fa LUMO in polyacenes LUMO in polycyanodienes LUMO values modes around 1500 molecular orbital monoanions of polyacenes monocations and monoanions N-substituted polyacene-series N-substituted polyacenes neighboring carbon atoms nitrogen atoms orbital interactions orbital vibronic coupling phase patterns phonon Phys polyacenes and polyfluoroacenes reduced mass respectively significantly stabilized stretching Ag modes superconductivity total electron-phonon coupling understood as follows values for polycyanodienes vames vibrational modes vibronic active modes vibronic coupling constants vibronic interactions