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On the controversial nature of the 1 B-1(u) and 2 B-1(u) states of trans-stilbene: The n-electron valence state perturbation theory approach (76 visite)

Angeli C, Improta R, Santoro F

J Chem Physj Chem Phys (ISSN: 0021-9606), 2009 May 7; 130(17): N/D-N/D.

Tipo di articolo: Journal Article, Abstract, Conference,

Impact factor: 3.093

Impact factor a 5 anni: 3.177


Parole chiave: Energy State, Experimental Observations, Experimental Values, First Excited State, Highest Occupied Molecular Orbitals, Lowest Un-Occupied Molecular Orbitals, Multi References, Oscillator Strengths, Perturbation Theories, Perturbation Theory Methods, Singlet State, Time-Dependent Density Functional Theories, Trans Stilbenes, Valence State, Vertical Excitation Energies, Molecular Modeling, Probability Density Function, Semiconductor Quantum Dots, Perturbation Techniques, Stilbene Derivative, Article, Chemistry, Electron, Quantum Theory, Stereoisomerism,

Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-65549136359&partnerID=40&md5=66b85d071cf58ccd3fee713d4c067bd7

The nature of two lowest-energy states of B-u symmetry of trans-stilbene and the accurate calculation of their vertical excitation energy have been the subject of a controversy because time dependent density functional theory (TD-DFT) calculations, in agreement with experimental observations, have questioned the results obtained with multireference perturbation theory (MRPT) in the CASPT2 implementation. This paper aims to solve this controversy. By using a different version of MRPT, the n-electron valence state perturbation theory method, the description provided by TD-DFT is confirmed: the lowest B-u singlet state has a HOMO -> LUMO nature and a large oscillator strength (HOMO refers to highest occupied molecular orbital and LUMO refers to lowest unoccupied molecular orbital), while the second B-u singlet state has a mixed HOMO-1 -> LUMO and HOMO -> LUMO+1 nature, has an oscillator strength almost vanishing, and is located at 0.6-0.7 eV higher than the first excited state. The computed vertical excitation energy to the first state (3.8-4.0 eV) is in good agreement with the experimental value.
*** IBB - CNR ***

Dipartimento di Chimica, Universit̀ di Ferrara, via Borsari 46, I-44100 Ferrara, Italy

Istituto di Biostrutture e Bioimmagini, CNR, via Mezzocannone 16, I-80134 Napoli, Italy

Istituto per i Processi Chimico-Fisici, CNR, Area della Ricerca Del CNR, via Moruzzi 1, I-56124 Pisa, Italy
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Nessun risultato.
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Interrogazione bibliografica effettuata: (([btitle] "Energy State" OR [btitle] "Experimental Observations" OR [btitle] "Experimental Values" OR [btitle] "First Excited State" OR [btitle] "Highest Occupied Molecular Orbitals") AND NOT [id] = 9054)





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