  Hydrogen bonding to chloride ions has been frequently discussed over the past
5 decades. Still, the possible role of such secondary intermolecular bonding
interactions in hydrogen bonded networks has not been investigated in any
detail. Here we consider computer models of concentrated aqueous LiCl solutions
and compute usual hydrogen bond network characteristics, such as distributions
of cluster sizes and of cyclic entities, both for models that take and do not
take chloride ions into account. During the analysis of hydrogen bonded rings,
a significant amount of 'solvent separated anion pairs' have been detected at
high LiCl concentrations. It is demonstrated that taking halide anions into
account as organic constituents of the hydrogen bonded network does make the
interpretation of structural details significantly more meaningful than when
considering water molecules only. Finally, we compare simulated structures
generated by 'good' and 'bad' potential sets on the basis of the tools
developed here, and show that this novel concept is, indeed, also helpful for
distinguishing between reasonable and meaningless structural models.
