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s-tetrazine in aqueous solution: A density functional study of hydrogen bonding and electronic excitations


Odelius, M; Kirchner, B; Hutter, J (2004). s-tetrazine in aqueous solution: A density functional study of hydrogen bonding and electronic excitations. Journal of Physical Chemistry. A, 108(11):2044-2052.

Abstract

Using density functional theory based methods we studied vertical and adiabatic excitations of the s-tetrazine molecule, small clusters with water molecules and a single s-tetrazine molecule within 60 water molecules using periodic boundary conditions. We therefore achieve a consistent description of s-tetrazine from the isolated molecule to full solvation in water. The explicit treatment of solvent molecules allows for an accurate treatment of solute-solvent interactions. For the isolated s-tetrazine molecule a comparison with earlier high level ab initio calculations and other density functional calculations is made. In accordance with experiment the most favorable two-water-adduct displays a homodromic feature, i.e., a chain of hydrogen bonding from the nitrogen of the s-tetrazine to its methenyl (CH) group. Radial distribution functions calculated from a Car-Parrinello molecular dynamics simulation of the aqueous solution clearly show an unexpected preference of water for hydrogen bonding to the C-H group over the nitrogen lone pairs. Only infrequent and short-lived hydrogen bonds from water molecules to the nitrogen atoms are found. Calculations of vertical excitations using time-dependent density functional theory showed that the solvent shifts can be explained from the polarization of the Kohn-Sham orbitals of the solute. Hydrogen bonding has only a minor effect on the solvent shifts of low lying states of s-tetrazine.

Using density functional theory based methods we studied vertical and adiabatic excitations of the s-tetrazine molecule, small clusters with water molecules and a single s-tetrazine molecule within 60 water molecules using periodic boundary conditions. We therefore achieve a consistent description of s-tetrazine from the isolated molecule to full solvation in water. The explicit treatment of solvent molecules allows for an accurate treatment of solute-solvent interactions. For the isolated s-tetrazine molecule a comparison with earlier high level ab initio calculations and other density functional calculations is made. In accordance with experiment the most favorable two-water-adduct displays a homodromic feature, i.e., a chain of hydrogen bonding from the nitrogen of the s-tetrazine to its methenyl (CH) group. Radial distribution functions calculated from a Car-Parrinello molecular dynamics simulation of the aqueous solution clearly show an unexpected preference of water for hydrogen bonding to the C-H group over the nitrogen lone pairs. Only infrequent and short-lived hydrogen bonds from water molecules to the nitrogen atoms are found. Calculations of vertical excitations using time-dependent density functional theory showed that the solvent shifts can be explained from the polarization of the Kohn-Sham orbitals of the solute. Hydrogen bonding has only a minor effect on the solvent shifts of low lying states of s-tetrazine.

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27 citations in Web of Science®
29 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Language:English
Date:2004
Deposited On:27 Mar 2009 09:26
Last Modified:05 Apr 2016 12:26
Publisher:American Chemical Society
ISSN:1089-5639
Publisher DOI:10.1021/jp0368381
Permanent URL: http://doi.org/10.5167/uzh-3185

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