We have calculated the equilibrium geometries of the hydrated complexes, H2OCO2, H2OCS2,H2OOCS, H2OSO2, and H2OSO3, in the electronic ground state. We have used the coupled cluster with singles, doubles, and perturbative triples ab initio method with a correlation consistent augmented triple-zeta basis set. We find that a counterpoise corrected optimization scheme is important for an accurate description of the geometries. These high level ab initio calculated geometries are of comparable quality to those obtained experimentally.

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