title: IPPP-CLOPPA Analysis of the Influence of the Methylation on the Potential Energy and the Molecular Polarizability of the Hydrogen Bonds in the Cytosine-Guanine Base Pair.
abstract: The IPPP-CLOPPA method is applied to investigate the influence of a methyl group on the energy of the hydrogen bonds and the potential energy curve of the bridge protons in model compounds, which mimic the methylated and unmethylated cytosine-guanine base pairs. On the same grounds, this influence on the polarizability of the intermolecular hydrogen bonds of these compounds is also addressed, in order to determine whether this linear response property provides a significant proof of the electronic mechanisms that affect the stabilization of the hydrogen bonds. Results obtained show that the methyl electronic system delocalizes on the hydrogen bond region, and changes of these intermolecular hydrogen bonds are due to this effect of delocalization.
authors.affiliation: Facultad de Ciencias Exactas y Naturales, Departamento de Física, Universidad de Buenos Aires , 1428 Buenos Aires, Argentina.|Instituto de Física de Buenos Aires (IFIBA), CONICET, Universidad de Buenos Aires , 1428 Buenos Aires, Argentina.
authors.forename: Claudia G
authors.identifier: http://orcid.org/0000-0002-3661-1693
authors.initials: CG
authors.lastname: Giribet
authors.affiliation: Facultad de Ciencias Exactas y Naturales, Departamento de Física, Universidad de Buenos Aires , 1428 Buenos Aires, Argentina.|Instituto de Física de Buenos Aires (IFIBA), CONICET, Universidad de Buenos Aires , 1428 Buenos Aires, Argentina.
authors.forename: Martín C
authors.initials: MC
authors.lastname: Ruiz de Azúa
mesh_terms: D020029:Base Pairing; D003596:Cytosine / Q000737:chemistry*; D006147:Guanine / Q000737:chemistry*; D006860:Hydrogen Bonding; D008745:Methylation; D011789:Quantum Theory
chemical_list: D006147:Guanine; D003596:Cytosine