Analysis of Hydrogen Bonds in Crystals

Crystal structures are a source of information on geometries of species that form networks in solids, in addition to providing information on the nature of interactions that occur between them. Hydrogen bonding is one of the most important interactions responsible for the arrangements of molecules and ions in crystals. For this reason, this special issue collects new, interesting, and important findings and ideas on the role of the hydrogen bond in crystals. The contributions of this issue may be classified into three groups: the first concerns new crystal structures where interesting arrangements of species are described; the second group considers crystal structures and their observed phenomena; and the last group is strongly related to a discussion on theoretical results, where often hydrogen bond interactions are compared with other interactions (halogen bond, pnicogen bond, carbon bond, etc.). Despite the fact that the last group of articles concerns the results of calculations, it is strongly associated with experiment since the results are compared with experimental observations. Besides other interesting phenomena, the hydrogen bond interactions are well described in the theoretical work.