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Can we understand the different coordinations and structures of closed‐shell metal cation‐water clusters?
Author(s) -
Derepas A.L.,
Soudan J.M.,
Brenner V.,
Dog J.P.,
Millié Ph.
Publication year - 2002
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.10063
Subject(s) - coordination sphere , polarizability , chemistry , cluster (spacecraft) , coordination number , molecule , chemical physics , solvation shell , hydrogen bond , interaction energy , ab initio , monte carlo method , ion , computational chemistry , crystallography , solvation , statistics , mathematics , organic chemistry , computer science , programming language
We present a model potential for studying M q+ (H 2 O) n=1,9 clusters where M stands for either Na + , Cs + , Ca 2+ , Ba 2+ , or La 3+ . The potential energy surfaces (PES) are explored by the Monte Carlo growth method. The results for the most significant equilibrium structures of the PES as well as for energetics are favorably compared to the best ab initio calculations found in the literature and to experimental results. Most of these complexes have a different coordination number in cluster compared to experimental results in solution or solid phase. An interpretation of the coordination number in clusters is given. In order to well describe the transition between the first hydration sphere and the second one we show that an autocoherent treatment of the electric field is necessary to correctly deal with polarization effects. We also explore the influence of the cation properties (charge, size, and polarizability) on both structures and coordination number in clusters, as well as the meaning of the second hydration sphere. Such an approach shows that the leading term in the interaction energy for a molecule in the second hydration sphere is an electrostatic attraction to the cation and not a hydrogen bond with the water molecules in the first hydration sphere. © 2002 Wiley Periodicals, Inc. J Comput Chem 23: 1013–1030, 2002