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Exploring the potential energy surface of retinal, a comparison of the performance of different methods

Fredrik Blomgren (Institutionen för kemi- och bioteknik) ; Sven Larsson (Institutionen för kemi- och bioteknik, Fysikalisk kemi)
Journal of Computational Chemistry (01928651 ). Vol. 26 (2005), 7, p. 738-742.
[Artikel, refereegranskad vetenskaplig]

The ground state structure of retinal has been investigated. We found that DFT and CASSCF produce different results for the bond length alternation in a model system of retinal. Quantum mechanics/molecular mechanics calculations including the closest surrounding amino acids have been performed, using DFT and CASSCF to calculate the structure of retinal in the protein cavity. The planarity of the retinal molecule is affected by the surrounding protein. DFT and CASSCF produce different twist angles. The difference between CASSCF and DFT appears to be related to the positively charged nitrogen of the Schiff base, which leads to different π-bond orders produced by the two methods.



Denna post skapades 2010-01-26. Senast ändrad 2010-08-12.
CPL Pubid: 110932

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik (2005-2014)
Institutionen för kemi- och bioteknik, Fysikalisk kemi (2005-2014)

Ämnesområden

Kemiteknik

Chalmers infrastruktur