Issue 45, 2017

Hydration of iron–porphyrins: ab initio quantum mechanical charge field molecular dynamics simulation study

Abstract

The ab initio quantum mechanical charge field molecular dynamics (QMCF-MD) simulation approach was successfully applied to Fe2+–P and Fe3+–P in water to evaluate their structural, dynamical and energetic properties. Based on the structural data, it was found that Fe2+–P accommodates one water molecule in the first coordination sphere of the Fe2+ ion including the four nitrogen atoms of the porphyrin system coordinating with central metal species. On the other hand, two water molecules were coordinated to Fe3+–P, thus forming a hexa-coordinated species. Comparison of dynamical properties such as the vibrational power spectrum and ligand mean residence times to other metal-free porphyrin systems demonstrate the ions' influence on the hydration structure, enabling a characterisation of the strong interaction of the ions which greatly reduces the hydrogen bonding potential of the complex. The association of water molecules with the metal ions in both solutes was quantified by computing the free energy of binding obtained via the potential of mean force. This further confirmed the strong association of water to the metal ions which was conversely weak as inferred from the energetic data for the Fe2+–P system.

Graphical abstract: Hydration of iron–porphyrins: ab initio quantum mechanical charge field molecular dynamics simulation study

Supplementary files

Article information

Article type
Paper
Submitted
01 Jul 2017
Accepted
03 Nov 2017
First published
03 Nov 2017

Phys. Chem. Chem. Phys., 2017,19, 30822-30833

Hydration of iron–porphyrins: ab initio quantum mechanical charge field molecular dynamics simulation study

S. T. Moin and T. S. Hofer, Phys. Chem. Chem. Phys., 2017, 19, 30822 DOI: 10.1039/C7CP04436D

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