Three‐Dimensional Porous NbO‐Type Anionic Framework: Synthesis, Structure, Magnetic and Adsorption Properties

Three-dimensional porous framework{[Ni-3(BPTCA)(2)(H2O)(2)]-[Ni(H2O)(6)]center dot 10H(2)O}(n) (1) was synthesized by using the 4,4'-bipyridine-2,2'6,6'-tetracarboxylic acid anion (BPTCA(-4)) as building block under hydrothermal conditions. The structural analysis revealed this complex has a NbO topology. Unexpectedly, 1 has an anionic framework with 10.9 x 8.7 angstrom rectangle channels, and the cationic [Ni(H2O)(6)](2+) species serve as guest. In addition, thermogravimetric analyses proved 1 can keep its crystalline nature even at 300 degrees C. The nitrogen adsorption and magnetic properties of 1 were also investigated.