caa a22 4500 605510652 CHVBK 20210128100647.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00894-014-2558-0 doi (NATIONALLICENCE)springer-10.1007/s00894-014-2558-0 Yurtsever Ersin Chemistry Department, Koç University, Rumelifeneriyolu, 34450, Sariyer, Istanbul, Turkey aut A mixed basis with off-center Gaussian functions for the calculation of the potential energy surfaces for π-stacking interactions: dimers of benzene and planar C6 [Elektronische Daten] [Ersin Yurtsever] A practical mixed basis set was developed to facilitate accurate calculations of potential energy surfaces for π-stacking interactions. Correlation consistent basis sets (cc-PVXZ) were augmented by p-type Gaussian functions placed above and below the planes of C6 moieties. Møller-Plesset (MP2, SCS-MP2) and coupled cluster [CCSD(T)] calculations show that such generated basis sets provide an accurate description of π-stacking systems with favorable computation times compared to the standard augmented basis sets. The addition of these off-center functions eliminates the linear dependence of the augmented basis sets, which is one of the most encountered numerical problems during calculation of the oligomers of polyaromatic hydrocarbons (PAH). In this work, we present a comparative study of the general characteristics of the potential energy surfaces for the parallel stacked and T-shape conformations of benzene and planar C6 clusters, using a combination of cc-PVXZ and our optimized functions. We discuss properties, such as the depth and curvature of the potential functions, short and long distance behavior, and the frictional forces between two model monomers. Graphical Abstract Frictional forces for C6(δx in Ångstroms and F is in kcal/molÅ−1) Springer-Verlag Berlin Heidelberg, 2015 Stacking interactions nationallicence CCSD nationallicence Basis set nationallicence Journal of Molecular Modeling Springer Berlin Heidelberg 21/1(2015-01-01), 1-8 1610-2940 21:1<1 2015 21 894 https://doi.org/10.1007/s00894-014-2558-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00894-014-2558-0 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Yurtsever Ersin Chemistry Department, Koç University, Rumelifeneriyolu, 34450, Sariyer, Istanbul, Turkey aut NATIONALLICENCE 773 0- Journal of Molecular Modeling Springer Berlin Heidelberg 21/1(2015-01-01), 1-8 1610-2940 21:1<1 2015 21 894