  Here we demonstrate that significant progress in this area may be achieved by
introducing structural elements that form hydrogen bonds with environment.
Considering several examples of hybrid framework materials with different
structural ordering containing protonated sulfonium cation H3S+ that forms
strong hydrogen bonds with electronegative halogen anions (Cl-, F-), we found
that hydrogen bonding increases the structural stability of the material and
may be used for tuning electronic states near the bandgap. We suggest that such
a behavior has a universal character and should be observed in hybrid
inorganic-organic framework materials containing protonated cations. This
effect may serve as a viable route for optoelectronic and photovoltaic
applications.
