Self-Assembly by Tridentate or Bidentate Ligand: Synthesis and Vapor Adsorption Properties of Cu(II), Zn(II), Hg(II) and Cd(II) Complexes Derived from a Bis(pyridylhydrazone) Compound

Four complexes, [Cu(4)L(2)(OCH(3))(2)(CH(3)OH)(2)]·2H(2)O (1), [Zn(2)L(2)Cl(4)]·2H(2)O·2CH(3)OH (2), [Hg(2)L(2)Br(4)]·4CH(3)OH (3), and {[CdL(2)Cl(2)]·4H(2)O·4CH(3)OH}(n) (4), have been synthesized and characterized from a bis(pyridylhydrazone) ligand (L) with copper(II), zinc(II), mercury(II) or cadmium(II), respectively. Complex 1 exists as a centrosymmetric tetranuclear dimer with L as deprotonated tridentate ligand. Complexes 2 and 3 exist as centrosymmetric metallamacrocycles with L as bidentate ligand. Complex 4 exists as a 1D looped-chain coordination polymer. The thermal stabilities and vapor adsorption properties of the four complexes were investigated as well.