Assessment of density functionals on intramolecular dispersion interaction in large normal alkanes

作者：Miao Junjian; Hua Shugui; Li Shuhua^*

来源：Chemical Physics Letters, 2012, 541: 7-11.

DOI：10.1016/j.cplett.2012.05.067

The performance of a number of density functionals in describing intramolecular dispersion interaction has been assessed by studying the conformational energy differences between the all-gauche and all-trans conformers of large normal alkanes. The generalized energy-based fragmentation approach is applied to perform CCSD(T) or MP2 calculations for these large alkanes. The M06-2X functional is demonstrated to provide satisfactory descriptions. With an empirical dispersion correction, some functionals like wB97X and LC-wPBE can also show comparable performance as the M06-2X functional, while other functionals like PBE, TPSS and B3LYP are still not accurate enough for quantitative descriptions.

• 出版日期2012-7-10
• 单位南京大学