Abinitio SCF-MO calculations of features of the lowest triplet state potential surfaces of several tetraatomic carbonyl compounds

1982 ◽  
Vol 60 (2) ◽  
pp. 100-105 ◽  
Author(s):  
A. Kapur ◽  
R. P. Steer ◽  
P. G. Mezey
Keyword(s):  
Potential Energy ◽  
Triplet State ◽  
Carbonyl Compounds ◽  
Potential Energy Surfaces ◽  
Vibrational Frequencies ◽  
Mo Calculations ◽  
Potential Surfaces ◽  
Out Of Plane ◽  
State Potential ◽  
Energy Surfaces

Non-empirical SCF-MO calculations have been carried out for a series of tetraatomic carbonyl compounds. Portions of the ground singlet and first triplet state potential energy surfaces, in particular those along the out-of-plane bending coordinates, have been determined. Estimates of the first triplet state out-of-plane vibrational frequencies have been calculated.

Resolving the Quadruple Bonding Conundrum in C2 Using Insights Derived from Excited State Potential Energy Surfaces: A Molecular Orbital Perspective

2019 ◽  
Author(s):  
Ishita Bhattacharjee ◽  
Debashree Ghosh ◽  
Ankan Paul
Keyword(s):  
Excited State ◽  
Potential Energy ◽  
Molecular Orbital ◽  
High Spin ◽  
Potential Energy Surfaces ◽  
Valence Bond ◽  
Deep Minimum ◽  
State Potential ◽  
Energy Surfaces ◽  
Mo Theory

The question of quadruple bonding in C<sub>2</sub> has emerged as a hot button issue, with opinions sharply divided between the practitioners of Valence Bond (VB) and Molecular Orbital (MO) theory. Here, we have systematically studied the Potential Energy Curves (PECs) of low lying high spin sigma states of C<sub>2</sub>, N<sub>2</sub> and Be<sub>2</sub> and HC≡CH using several MO based techniques such as CASSCF, RASSCF and MRCI. The analyses of the PECs for the<sup> 2S+1</sup>Σ<sub>g/u</sub> (with 2S+1=1,3,5,7,9) states of C<sub>2</sub> and comparisons with those of relevant dimers and the respective wavefunctions were conducted. We contend that unlike in the case of N<sub>2</sub> and HC≡CH, the presence of a deep minimum in the <sup>7</sup>Σ state of C<sub>2</sub> and CN<sup>+</sup> suggest a latent quadruple bonding nature in these two dimers. Hence, we have struck a reconciliatory note between the MO and VB approaches. The evidence provided by us can be experimentally verified, thus providing the window so that the narrative can move beyond theoretical conjectures.

Accuracy of Coupled Cluster Excited State Potential Energy Surfaces

2018 ◽  
Vol 14 (11) ◽  
pp. 5859-5869 ◽  
Author(s):  
Attila Tajti ◽  
John F. Stanton ◽  
Devin A. Matthews ◽  
Péter G. Szalay
Keyword(s):  
Excited State ◽  
Potential Energy ◽  
Potential Energy Surfaces ◽  
Coupled Cluster ◽  
State Potential ◽  
Energy Surfaces
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