Structure and dynamics of the [Zn(NH3)(H2O)5]2+ complex in aqueous solution obtained by an ab initio QM/MM molecular dynamics study

Physical Chemistry Chemical Physics : PCCP
M Qaiser FatmiBernd M Rode

Abstract

A model complex of the hexahydrated zinc(ii) cation with one water substituted by ammonia in aqueous solution has been studied by hybrid ab initio quantum mechanical/molecular mechanical (QM/MM) molecular dynamics (MD) at the double-zeta Hartree-Fock (HF) quantum mechanical level. The first solvation shell, consisting of 5 + 1 ligand(s) at mean distances of 2.2 and 2.1 A, respectively, from the Zn(ii) ion, was found to remain stable with respect to exchange processes within the simulation time. The labile second shell consists on average of approximately 19 water molecules. For structural elucidation of the pentaaquozinc(ii) amine complex in aqueous solution several data sets such as radial distribution functions (RDF), coordination number distributions (CND) and different angular distributions (ADF, tilt and theta angle) were employed. Dynamics were characterised by the ligands' mean residence time (MRT), ion-ligand stretching frequencies and the vibrational and librational motions of water ligands. The labile second shell's MRT value decreases upon introduction of one NH(3) ligand to 7.2 ps from the 10.5 ps observed for the hexaaquozinc(ii) complex.

References

Jul 1, 1988·Zeitschrift Für Naturforschung. C, a Journal of Biosciences·C P MurthyC von Sonntag
Jan 1, 1985·The Journal of Chemical Physics·D J DeFrees, A D McLean
Feb 8, 2002·Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine·L A Gaither, D J Eide
Aug 20, 2005·The Journal of Chemical Physics·M Qaiser FatmiBernd M Rode
Apr 21, 2005·Physical Chemistry Chemical Physics : PCCP·Christian F SchwenkBernd M Rode

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Citations

Nov 7, 2012·The Journal of Chemical Physics·Hok Hei TamMichael E Paulaitis
Jun 15, 2010·Physical Chemistry Chemical Physics : PCCP·M Qaiser FatmiBernd M Rode
Jan 15, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Giovanni Russo, Jean Jacques E Slotine
May 2, 2008·The Journal of Physical Chemistry. B·M Qaiser FatmiBernd M Rode

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