Designed Assemblies of Metal Halo and Pseudohalo Coordination Polymers with Bridging 1-Substituted Ditetrazoles

Abstract

The simple reactions between inorganic salts [CuX 2 or M(SCN) 2 ] and 1-ditetrazoles [btzb = 1,4-bis(tetrazol-1 yl)butane or btze = 1,2-bis(tetrazol-1-yl)ethane] at room temperature produced seven new coordination polymers: three-dimensional (3-D) CuX 2 (1,4-btzb) (X - = Cl - 1, Br - 2), two-dimensional (2-D) Cd(SCN) 2 (1,4-btzb) (3) and Cd(SCN) 2 (1,2-btze) (4), and one-dimensional (1-D) M(SCN) 2 (1,4-btzb) 2 (M = Ni 5, Co 6) and Ni(SCN) 2 (1,2-btze) 2 (7). With 1-ditetrazoles as the bridges, the 2-D grid-like CuX 2 secondary building units (SBUs) are extended into 3-D network compounds 1 and 2, the 1-D chained Cd(SCN) 2 SBUs based on Cd(SCN) 2 Cd units are linked into 2-D layered compounds 3 and 4 with the macrocyclic rings, whereas the mononuclear trans-M(SCN) 2 units are connected into 1-D chained compounds 5-7 based on M(1-ditetrazole) 2 M macrocyclic rings. It deserves mentioning that 1-ditetrazoles show different shapes in different complexes: Z-shape in 1-4 and V-shape in 5-7. All the complexes are characterized by elemental analysis (CHNS), infrared spectroscopy, and thermogravimetric analysis.