Structure and Thermal Stability of a Novel 2‐D Layered Copper(II) Coordination Polymer with the Bidentate Ligand 1, 2, 4‐Triazol‐5‐one

Single crystals of {[Cu(TO) 2 (H 2 O) 2 ](NO 3 ) 2 } n (TO: 1, 2, 4‐triazol‐5‐one) were grown by slow evaporation from aqueous solution. It crystallizes in the orthorhombic space group Pbca , with a = 7.082(1), b = 10.285(1), c = 17.911(3)Å, V = 1304.6(3)Å 3 , Z = 4. The Cu II distorted octahedra are bridged by bidentate TO ligands into infinite 2‐D interlaced rhombic grid‐like network planes, {[Cu(TO) 2 (H 2 O) 2 ] 2+ } n . Hydrogen bonds, electrostatic interactions, and weak van der Waals ' forces assemble these planes and the NO 3 — anions to a layered structure. The title compound decomposes at 153.4 °C to the final products, Cu(CN) 2 and CuO.