Low-dimensional compounds containing cyanido groups. XXIX. Crystal structures, spectral and magnetic properties of five [Cu(L) 2 X]C(CN) 3 complexes (L 5 2,2 0 -bipyridine or 1, 10-phenanthroline; X 5 Cl 2 , Br 2 or CH 3 COO 2 ) Abstract Five new ionic [Cu(L) 2 X]C(CN) 3 (L = 2,2 0 -bipyridine (bpy) or 1,10-phenanthroline (phen), X = Cl -, (4) and [Cu(phen) 2 Br 0.7 (CH 3 COO) 0.3 ]C(CN) 3 Á0.5H 2 O (5), have been synthesized and characterized by IR and UV-Vis spectroscopy. X-ray structural analysis revealed that the structures of all discussed compounds consist of [Cu(L) 2-X] ? complex cations and uncoordinated C(CN) 3 -counteranions; water molecules were found in 2, 3, 4 and 5; a molecule of ethanol was found in 4, too. The shapes of coordination polyhedra around the copper atoms, which are pentacoordinated by two bidentate bpy or phen molecules and Cl -, Br -or CH 3 COO -ligands monodentately coordinated in the equatorial plane, are distorted trigonal bipyramids. Structures of 1-5 are stabilized by weak p-p interactions and by hydrogen bonds. Magnetic properties of complexes 1-4 are characterized by the presence of weak antiferromagnetic exchange couplings.