2,2'-Dipyridyl 2,2' bipyridine 18 article 18 chemistry 14 Animals 10 Molecular Structure 8 chemical structure 8 Crystallography, X-Ray 6 Ligands 6 Organometallic Compounds 6 X ray crystallography 6 animal 6 drug effects 6 nonhuman 6 Acids 4 Aqua ligands 4 Asymmetric units 4 Atoms 4 Binding energy 4 Binding modes 4 Bipyridine 4 Bipyridines 4 Butane 4 Chemical units 4 Copper 4 Crystal structure 4 Dihydrate 4 Dioic acids 4 Donor atoms 4 Electron Spin Resonance Spectroscopy 4