Coordination Complexes Copper Crystallography, X-Ray Hydrogen Bonding Hydrogen bonds Ligands Models, Molecular Significant differences X ray crystallography article chemical structure chemistry coordination compound copper hydrogen bond ligand Alkanes Aza Compounds Chiral compounds Chlorine compounds Coordination environment Copper complexes Copper compounds Crystal structure Equatorial sites Hydrates Hydration Hydrogen-bond donors Inorganic compounds Inter molecular hydrogen bondings