Theoretical investigations of anion-π interactions

The role of anions and the nature of π systems

Dongwook Kim, Tarakeshwar Pilarisetty, Kwang S. Kim

Research output: Contribution to journalArticle

227 Citations (Scopus)

Abstract

The nature of the anion-π interaction has been investigated by carrying out high level ab initio calculations of the complexes of halide (F-, Cl-, and Br-), linear organic (CN-, NC-), and trigonal planar organic (NO3 - and CO3 2-) anions with different kinds of π systems, viz. olefinic (tetrafluoroethene), aromatic (hexafluorobenzene), and heteroaromatic (1,3,5-triazine). In effort to comprehend the underlying basis of this interaction, we have also carried out a rigorous decomposition of the interaction energies using the symmetry adapted perturbational theory (SAPT) method. Contrary to our expectations, the results indicate that the magnitudes of total interation energies of anion-π and cation-π interactions are similar. In contrast to cation-π interactions, anion-π interactions are, however, marked by substantial contributions from dispersion energies. As in the case of cation-π interactions, the role of anions also have a marked influence on the nature and magnitude of the anion-π interaction with interactions involving halide anions being dominated by electrostatic and the induction energies. On the other hand, dispersion energies are markedly higher in interactions involving organic anions. Apart from aiding an understanding of the origin of anion-π interaction, we believe that the present results would help understand the basis of biomolecular structures and enzyme-substrate interactions and also aid the design of new drugs and novel ionophores/receptors.

Original languageEnglish (US)
Pages (from-to)1250-1258
Number of pages9
JournalJournal of Physical Chemistry A
Volume108
Issue number7
DOIs
StatePublished - Feb 19 2004
Externally publishedYes

Fingerprint

Anions
anions
interactions
Cations
cations
halides
Triazines
Ionophores
energy
Electrostatics
Decomposition
enzymes
induction
drugs
Substrates
Enzymes
electrostatics
decomposition
Pharmaceutical Preparations
symmetry

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Theoretical investigations of anion-π interactions : The role of anions and the nature of π systems. / Kim, Dongwook; Pilarisetty, Tarakeshwar; Kim, Kwang S.

In: Journal of Physical Chemistry A, Vol. 108, No. 7, 19.02.2004, p. 1250-1258.

Research output: Contribution to journalArticle

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