New heterometallic coordination polymers based on zinc(II) complexes with Schiff-base ligands and dicyanometallates: synthesis, crystal structures, and luminescent properties

Four new d(10) heterometallic coordination polymers have been obtained using three Schiff-base ligands, zinc(II) nitrate, and dicyanometallates: (1)[{Zn-3(Salen)(2)}{-Au(CN)(2)}(2)] (1); (1)[Zn(Saldmen){-Ag(CN)(2)}]2H(2)O (2); (1)[Zn(Salampy){-Ag(CN)(2)}] (3); (1)[Zn(Salampy){-Au(CN)(2)}] (4). The Schiff bases are obtained from condensation of salicylaldehyde with ethylenediamine (H(2)Salen); N,N-dimethyl-ethylenediamine (HSaldmen) and, respectively, 2-aminomethyl-pyridine (HSalampy). The dicyanometallates are K[Ag(CN)(2)] and K[Au(CN)(2)]. The compounds were characterized by X-ray single-crystal diffraction, infrared spectroscopy, UV-vis spectroscopy, and elemental analysis. In compound 1, the homotrimetallic units, {Zn-3(salen)(2)}(2+), are connected by two [Au(CN)(2)](-) bridges, forming a 1-D double chain. In compounds 2-4, the crystal structures show polymeric zigzag chains generated by the mononuclear zinc(II) nodes and [M(CN)(2)](-) spacers. The luminescence properties of the new heterometallic polymers have also been investigated.