Copper(II) coordination polymers constructed from flexible ligands with different spacer lengths: syntheses, structures, and properties

Abstract

A new family of coordination polymers, {[Cu(btm)₂(H₂O)₂](NO₃)₂(H₂O)₄} _n (1, btm = bis(1,2,4-triazol-1-yl)methane), {[Cu(bte)₂(H₂O)₂](NO₃)₂} _n (2, bte = 1,2-bis(1,2,4-triazol-1-yl)ethane), [Cu(btp)₂(NO₃)₂] _n (3, btp = 1,3-bis(1,2,4-triazol-1-yl)propane), and {[Cu(btb)₂(H₂O)₂](NO₃)₂} _n (4, btb = 1,4-bis(1,2,4-triazol-1-yl)butane), have been prepared under hydrothermal conditions and characterized by X-ray structural analyses. The bis(triazole) ligands with different spacer lengths exhibit conformational flexibility and lead to diverse architectures. Compound 1 shows 2-D rectangular networks with (4,4) topology, with 2-D planar nanogrid networks stacked in a step stacking fashion. Compounds 2 and 3 show 1-D double-strained chains; 4 is a 3-D dia diamond network with one point, {6⁶}. Elemental analysis, IR, and thermal stability also characterize the compounds.

Keywords:

• Bis(1,2,4-triazol-1-yl)methane
• 1,2-Bis(1,2,4-triazol-1-yl)ethane
• 1,3-Bis(1,2,4-triazol-1-yl)propane
• 1,4-Bis(1,2,4-triazol-1-yl)butane
• Supramolecular structure
• Hydrogen-bond interaction

Acknowledgements

This work was financially supported by the Natural Science Foundation of Tianjin (No. 12JCZDJC27600), P.R. China.