The results of a theoretical study of the I-H2O anion and its neutral precu
rsors are presented. The hydrogen-bonded structures were predicted for both
the ionic and neutral complexes. The energetically preferred isomer for IH
2O however is a species with the direct O-I bond. The relation between the
potential energy surfaces for ionic and neutral moieties is evaluated based
on their electron affinity properties. Thermodynamic and spectroscopic (IR
) properties of complexes are discussed. The interaction energy decompositi
on is applied to explore the differences between the nature of bonding with
in the studied complexes. (C) 2001 American Institute of Physics.