in liquid ammonia
Generally, very little is known about the solvation structures
of anions associated with protonic defects, but what information
exists indicates that these anions exhibit a rich and complex
behavior in solution (see, e.g., Refs. [8], [9]
and [73]).
Unlike the cation case, the anions of
protonic defects possess a considerably more dynamic solvation shell that
fluctuates among a variety of structural motifs.
In addition, many
of these structures correspond to unexpectedly high coordination numbers.
These unusually high coordination numbers result partly or entirely
from a relatively large number
of solvent molecules donating hydrogen bonds to the anion than would
be expected based on the number of lone pairs.
This phenomenon has already been observed for OH 
in water both
experimentally [74] and
theoretically [8, 9]. The case of
NH in ammonia will be seen to possess equally rich structural
properties, which will be shown to arise from a strong delocalization
of the lone pair electrons.