Using Valence Bond Theory to Understand Electronic Excited States:  Application to the Hidden Excited State (21Ag) of C2nH2n+2(n= 2−14) Polyenes

2000 ◽  
Vol 104 (38) ◽  
pp. 8744-8758 ◽  
Author(s):  
Wei Wu ◽  
David Danovich ◽  
Avital Shurki ◽  
Sason Shaik
Keyword(s):  
Excited State ◽  
Excited States ◽  
Valence Bond ◽  
Valence Bond Theory ◽  
Electronic Excited States ◽  
Bond Theory

The Atomic Exciton Model for the Excited States of p-Electron Systems

1985 ◽  
Vol 38 (10) ◽  
pp. 1529
Author(s):  
PE Schipper
Keyword(s):  
Excited States ◽  
Ground State ◽  
Valence Bond ◽  
Essential Difference ◽  
Electron Systems ◽  
Exciton Model ◽  
Valence Bond Theory ◽  
Bond Theory ◽  
Atomic Excitations ◽  
Insight Into

A new model is presented to describe the π-π* excitations of π-electron systems in terms of intra-atomic excitations. The atomic exciton model combines features of conventional exciton and valence bond theory, reducing to the former in the non-exchanging limit, and the latter in the ground-state limit with covalent structures. The model is ideally suited to the approximate or exact incorporation of exchange, and highlights the opposition of excitation and electron interchange in determining the energetics of the excitation manifold, eliciting thereby the essential difference between ground and excited states. Applications to some simple π-systems are considered, providing new insight into their excited states.

Excited State Tracking During the Relaxation of Coordination Compounds

2018 ◽  
Author(s):  
Juan Sanz García ◽  
Martial Boggio-Pasqua ◽  
Ilaria Ciofini ◽  
Marco Campetella
Keyword(s):  
Excited State ◽  
Excited States ◽  
Potential Energy Surfaces ◽  
Photochemical Reactions ◽  
Complex Nature ◽  
Electronic Excited States ◽  
Ruthenium Nitrosyl ◽  
State Tracking ◽  
Energy Surfaces ◽  
Electronic Wavefunction

<div>The ability to locate minima on electronic excited states (ESs) potential energy surfaces (PESs) both in the case of bright and dark states is crucial for a full understanding of photochemical reactions. This task has become a standard practice for small- to medium-sized organic chromophores thanks to the constant developments in the field of computational photochemistry. However, this remains a very challenging effort when it comes to the optimization of ESs of transition metal complexes (TMCs), not only due to the presence of several electronic excited states close in energy, but also due to the complex nature of the excited states involved. In this article, we present a simple yet powerful method to follow an excited state of interest during a structural optimization in the case of TMC, based on the use of a compact hole-particle representation of the electronic transition, namely the natural transition orbitals (NTOs). State tracking using NTOs is unambiguously accomplished by computing the mono-electronic wavefunction overlap between consecutive steps of the optimization. Here, we demonstrate that this simple but robust procedure works not only in the case of the cytosine but also in the case of the ES optimization of a ruthenium-nitrosyl complex which is very problematic with standard approaches.</div>

scholarly journals The electronic structure of carbones revealed: insights from valence bond theory

2021 ◽  
Vol 23 (5) ◽  
pp. 3327-3334
Author(s):  
Remco W. A. Havenith ◽  
Ana V. Cunha ◽  
Johannes E. M. N. Klein ◽  
Francesca Perolari ◽  
Xintao Feng
Keyword(s):  
Electronic Structure ◽  
Valence Bond ◽  
Carbon Suboxide ◽  
Valence Bond Theory ◽  
Bond Theory

Valence bond theory reveals the nature of the OC–C bond in carbon suboxide and related allene compounds.

ChemInform Abstract: Study of the Electronic States of the Benzene Molecule Using Spin- Coupled Valence Bond Theory.

ChemInform ◽  
2010 ◽  
Vol 26 (7) ◽  
pp. no-no
Author(s):  
E. C. DA SILVA ◽  
J. GERRATT ◽  
D. L. COOPER ◽  
M. RAIMONDI
Keyword(s):  
Valence Bond ◽  
Electronic States ◽  
Benzene Molecule ◽  
Valence Bond Theory ◽  
Bond Theory
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