Novel three-dimensional networks cross-linked by two sets of hydrogen bonded frameworks based on 1-D {[M(H2O)4 (4,4′-dpdo)]-[ClO4]2•2(4,4′-dpdo)}n (4,4′-dpdo=4,4′-bipyridine dioxide; M = Co, Ni, Cu or Zn)

A series of novel coordination polymers {[M(H2O)(4)(4,4'-dpdo)][ClO4](2).2(4,4'-dpdo)}(n) (M = Co 1, Ni 2, Cu 3 or Zn 4; 4,4'-dpdo = 4,4'-bipyridine dioxide) have been synthesized and characterized by X-ray diffraction analysis. They are isomorphous and crystallize in the triclinic system and space group P(1) over bar. dpdo bridges the metal centers to form a covalent chain. Two solvate dpdo link these chains through hydrogen bonding to form two sets of three-dimensional networks which are interwoven through a common conjunctive point [M(H2O)(4)](2+), leading to three-dimensional open frameworks with triangular channels. ClO4- anions are included within these channels through weak C-H . . .O hydrogen bonding.