Simulations of hydrogen bonds in crystals and their comparison with neutron diffraction results

The influence of the hydrogen bond formation on O-H, N-H and C-H groups have been studied by crystal structure correlation methods on neutron diffraction data taken from Cambridge Structural Database. The correlations between the lengths of the donor groups and the proton...acceptor distances may be supported using the valence sum rule. Hydrogen bonds play a major role in determining molecular packing and conformations of molecules in crystals. Even the weak C-H..X hydrogen bonds which do not influence the donor groups may play a role for the arrangement of molecules in crystals.