MOLECULAR-INTERACTIONS IN SUBSTITUTED 2,2'-BIPYRIDINES - CRYSTAL-STRUCTURES OF 2,2'-BIPYRIDINE3,3'-DICARBOXYLIC ACID MONOHYDRATE AND (2,2'-BIPYRIDINE-3,3'-DICARBOXYLIC ACID)DICHLOROCOPPER(II) DIHYDRATE

In the monohydrate structure a = 8.315(1), b = 8.578(1) c = 16.952(2)A ngstrom, Orthorhombic, P2(1)2(1)2(1), there are intramolecular interac tions between the O atoms of the carboxyl groups and the C2 atoms of t he opposite rings. The water molecule present in the structure is invo lved in an extensive network of hydrogen bonds. In the dichlorocopper( II) dihydrate complex structure a = 12.442(1), b = 19.614(1), c = 14.4 81(1)Angstrom, beta = 94.38(1)degrees, Monoclinic, C2/c, the Cu(II) is coordinated to two Cl atoms, two N atoms of the bipyridyle ligand and a water molecule. There are possible Cl ion bridges between the two C u atoms to form pseudo-discrete dimers. The uncoordinated carboxylic a cid groups and the water molecules, present in the complex, form an in teresting network of hydrogen bonds.