Syntheses, crystal structures and luminescence of zinc(II) and cadmium(II) complexes with 4′-substituted 2,2′:6′,2"-terpyridines

Four Zn(II) and Cd(II) complexes with two kinds of terpyridines have been synthesized and characterized. All these complexes are six N coordinated with two terpyridines. 3-D networks have been formed with hydrogen bonds and pi-pi interactions. The luminescence properties have been studied and all these ligands and complexes can be used as luminescence materials. Four terpyridine coordination complexes, [Zn(meophtpy)(2)]center dot(ClO4)(2)center dot(H2O) (1), [Cd(meophtpy)(2)]center dot(ClO4)(2) (2), [Zn(nh2phtpy)(2)]center dot(ClO4)(2) (3), and [Cd(nh2phtpy)(2)]center dot(ClO4)(2) (4) (meophtpy = 4'-(p-methoxylphenyl)-2,2':6',2 ''-terpyridine, nh2phtpy = 4'-aminophenyl-2,2':6',2 ''-terpyridine), were synthesized using the solvothermal method. These complexes have been characterized by IR spectra, elemental analyses, and X-ray diffraction. In all these complexes, the metal ions are coordinated by six nitrogens from two terpyridines. 3-D networks have been constructed by hydrogen bonds and pi-pi interactions. The luminescence of these four complexes has been investigated in the solid state at room temperature.