Structural changes as a function of torsional motion studied by ab initio calculations part 4. The dependence of the dynamic behavior of the structural parameters for H2O2 and H2S2 on basis sets and comparison with experimental results

1995 ◽  
Vol 346 ◽  
pp. 35-40 ◽  
Author(s):  
Svein Samdal ◽  
Vladimir S. Mastryukov ◽  
James E. Boggs
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Dynamic Behavior ◽  
Structural Changes ◽  
Structural Parameters ◽  
Experimental Results ◽  
Basis Sets ◽  
Torsional Motion

Conformational Stability and Structural Determination of Vinyldichlorosilane by ab initio Calculations

1999 ◽  
Vol 54 (8-9) ◽  
pp. 503-506
Author(s):  
Mohammad A. Qtaitat
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Structural Parameters ◽  
Conformational Stability ◽  
Basis Sets ◽  
Structural Determination

The Conformational stability and barriers of interconversion between the eis and gauche conformers of vinyldichlorosilane, CH2CHSiHCl2 , have been studied using ab initio calculations employing the RHF/3-21G* and RHF/6-31G* basis sets. The eis conformer was found to be more stable than the gauche one by 45 cm-1 (539 J/mol) and 140 cm-1 (1.68 kJ/mol) from the RHF/3-21G* and RHF/6-31G* basis sets, respectively. Additionally, the structural parameters of both rotamers have been calculated. These results are compared with results of related molecules.

scholarly journals Structural Parameters and Internal Rotational Barriers of tert-Butylammonium Ion: AM1 and ab initio Calculations

1992 ◽  
Vol 47 (12) ◽  
pp. 1255-1256
Author(s):  
Hiroyuki Ishida ◽  
Yoshihiro Kubozono ◽  
Setsuo Kashino ◽  
Ryuichi Ikeda
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Internal Rotation ◽  
Barrier Height ◽  
Structural Parameters ◽  
Mo Calculations ◽  
Ab Initio Mo Calculations ◽  
Rotational Barriers ◽  
Ab Initio Mo ◽  
Internal Rotational Barriers

Semiempirical and ab initio MO calculations were performed to estimate the structural parameters of tert-butylammonium ion and its potential energies for the internal rotation of the CH3 and NH3+ groups. The barrier height for the rotation of NH3+ was found to be lower than for that of CH3 , corresponding to the C - N bond being longer than the C - C bond.

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