Coordination Compounds of Substituted 1,lO-Phenanthrolines and Related Dipyridyls. IV. Physicochemical Study of Complexes of Copper and 2,9-Dimethyl-1,10-phenanthroline
The magnetic susceptibilities, conductivities, and infrared spectra of some complexes of copper and 2,9-dimethyl-1,10-phenanthroline (dmp) have been obtained. The magnetic moments of the copper(II) compounds lie in the range 1.9 to 2.0 B.M. Complexes of formula CudmpX2, where X = NO3, Cl, and Br, are nonelectrolytes in nitrobenzene. The substances Cu(dmp)2X2H2O and hydrated forms of the compounds Cu(dmp)2XClO4, where X = NO3, Cl, and Br behave as 1 : 1 electrolytes. The copper(II) ion in the bis complexes is at least five-coordinate and it is proposed that the donor nitrogen atoms take up a flattened tetrahedral arrangement. The complexes of formula Cu(dmp)2X, where X = NO3, ClO4, Cl, Br. I, and I3 are diamagnetic solids, 1 : 1 electrolytes in nitrobenzene, and are expected to have a tetrahedral arrangement of the four donor nitrogen atoms about the copper atom. The mono complexes CudmpX, where X = Cl, Br, and I are diamagnetic, practically insoluble in organic solvents, and probably dimeric with a tetrahedral arrangement of the ligand donor atoms.