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

Abstract. Three‐dimensional porous framework {[Ni 3 (BPTCA) 2 (H 2 O) 2 ][Ni(H 2 O) 6 ] · 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 × 8.7 Å rectangle channels, and the cationic [Ni(H 2 O) 6 ] 2+ species serve as guest. In addition, thermogravimetric analyses proved 1 can keep its crystalline nature even at 300 °C. The nitrogen adsorption and magnetic properties of 1 were also investigated.