Three-dimensional (3-D) metal-organic frameworks with 3-pyridin-4-yl-benzoate defining new (3,6)-connected net topologies

Reactions of different metal salts with 3-pyridin-4-yl-benzoic acid (3,4-Hpybz) under ambient condition afford a series of 3-D metal-organic frameworks with two new types of (3,6)-connected net topologies. In the isomorphic complexes [M₂(μ-H₂O)(3,4-pybz)₄]_n (M^II=Mn^II for 1, Zn^II for 2, or Cd^II for 3), the octahedral metal nodes are extended by the 3-connected pybz tectons to constitute 3-D arrays with the Schläfli symbol of (3.4.5)(3².4⁴.5⁵.6².7²), whereas [Pb(3,4-pybz)₂]_n (4) shows a completely different 3-D (4².6)₂(4⁴.6².8⁹) framework, which represents a subnet of the (4,8)-connected fluorite lattice.