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High‐Level Ab Initio Calculations of Intermolecular Interactions: Heavy Main‐Group Element π‐Interactions
Author(s) -
Krasowska Małgorzata,
Schneider Wolfgang B.,
Mehring Michael,
Auer Alexander A.
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201801758
Subject(s) - intermolecular force , ab initio , chemistry , coupled cluster , computational chemistry , ab initio quantum chemistry methods , main group element , dispersion (optics) , density functional theory , cluster (spacecraft) , benchmark (surveying) , chemical physics , molecule , physics , computer science , quantum mechanics , transition metal , organic chemistry , catalysis , geodesy , programming language , geography
This work reports high‐level ab initio calculations and a detailed analysis on the nature of intermolecular interactions of heavy main‐group element compounds and π systems. For this purpose we have chosen a set of benchmark molecules of the form MR 3 , in which M=As, Sb, or Bi, and R=CH 3 , OCH 3 , or Cl. Several methods for the description of weak intermolecular interactions are benchmarked including DFT‐D, DFT‐SAPT, MP2, and high‐level coupled cluster methods in the DLPNO‐CCSD(T) approximation. Using local energy decomposition (LED) and an analysis of the electron density, details of the nature of this interaction are unraveled. The results yield insight into the nature of dispersion and donor–acceptor interactions in this type of system, including systematic trends in the periodic table, and also provide a benchmark for dispersion interactions in heavy main‐group element compounds.