Anion-mediated self-assembly: Five Cd(ІІ) coordination aggregates with a mercaptotetrazole ligand
摘要:
Five Cd(II) complexes, {[Cd-4(MTZ)(2)(H2O)(2)Cl-8]center dot 0.5H(2)O}(n) (1), [Cd(MTZ)(2)Br-2] (2), [Cd-2(MTZ)(2)I-4] (3), [Cd-2(MTZ)(2)(H2O)(8)] (SO4)(2) (4). {[Cd(MTZ)(2)(H2O)2](ClO4)2}(n) (5), based on different anions with the mercaptotetrazole ligand MTZ (MTZ = 1-(2-dimethylamino-ethyl)-5-mercapto-1H-tetrazole) have been synthesized. Employment of different anions can result in structural diversity in 1-5. In 1, the Cd(II) ions make use of mu(2)-Cl, mu(3)-Cl bridging each other to form a novel Cd4Cl8 inorganic network structure. On the other hand, the 2D structure is further stabilized by MTZ as a tridentate bridging organic ligand holding three adjacent Cd(II) ions. In 2, MTZ as a terminal ligand coordinates with a Cd(II) ion to form a mononuclear structure. As a mu(2), eta(2) bridging ligand, MTZ links Cd(n) ions to form a dimeric structures in 3 and 4, and a 1D infinite chain in 5. In addition, the luminescent properties of 1-5 have been investigated in the solid state at room temperature. (C) 2011 Elsevier Ltd. All rights reserved.