title: Theoretical insights into the nature of intermolecular interactions in cytosine dimer.
abstract: In this study we discuss stacking interactions in cytosine dimer in conformations appearing in B-DNA crystals. The variational-perturbational scheme was applied for decomposition of the intermolecular interaction energy at the MP2 level of theory. The significant influence of the mutual orientation of cytosine monomers was observed not only on the total intermolecular interaction energy but also on its components: Different components of intermolecular interaction energy depend in different manner on parameters describing mutual orientation of cytosine monomers.
authors.affiliation: Institute of Organic and Pharmaceutical Chemistry, The National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, 11635 Athens, Greece.
authors.forename: Zaneta
authors.initials: Z
authors.lastname: Czyznikowska
authors.forename: Robert
authors.initials: R
authors.lastname: Zaleśny
mesh_terms: D020029:Base Pairing; D018360:Crystallography, X-Ray; D003596:Cytosine / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D011740:Pyrimidine Dimers / Q000737:chemistry*; D011789:Quantum Theory; D055672:Static Electricity
chemical_list: D011740:Pyrimidine Dimers; D003596:Cytosine; D004247:DNA