Repositorio Zaguan - Universidad de Zaragoza 

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Conformational energy calculations on the dipeptide formyl-L-alanyl-amide, using the quantum chemical RHF and MP2 with a range of Pople basis sets

Echenique, Pablo (

Language: eng

Abstract: This corresponds to a series of approximately 40,000 quantum chemical calculations on one single system, the model dipeptide HCO-L-Ala-NH2, with 16 atoms and no charge. The conformational space of this molecule is scanned by defining a regular 12x12 grid from -165º to 165º in 30º steps in the 2D space spanned by its Ramachandran angles phi and psi. The energy at each of these 144-points set is calculated using using the methods RHF and MP2, and a large number of Pople basis sets ranging from 3-21G to 6-311++G(2df,2pd). These methods are combined using the same one for the geometry optimization and the energy calculation (homolevel) or different ones (heterolevel). The dataset contains 274 grids, each one corresponding to a different homo- or heterolevel.
Keyword(s): alanine dipeptide ; quantum chemistry ; conformational energies ; RHF ; MP2 ; Pople basis sets

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 Record created 2011-09-07, last modified 2013-04-15

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