Self-Assembly of Right-Handed Helical Infinite Chain, One- and Two-Dimensional Coordination Polymers Tuned via Anions

Using similar synthesis conditions and a flexible ligand, 1,2-bis(1,2,4-triazole-1-yl)ethane (L), we isolated novel right-handed helical infinite chain [Zn(L)(Cl) 2 ] ( 1 ), two-dimensional (2D) coordination polymers [M(L) 2 (H 2 O) 2 ]·(NO 3 ) 2 [M = Zn ( 2 ), Cd ( 3 )], and a one-dimensional (1D) double-bridged complex [Cd(L) 2 (H 2 O) 2 ]·(ClO 4 ) 2 (H 2 O) 2 ( 4 ), where anions could tune the self-assemblies to form different supramolecular and coordination networks. Compound 1 is the first infinite helix in triazole compounds, where the supramolecular helical chain and the coordination chain form a unique double helical structure. Nitrate and perchlorate anions induced different supramolecular structures, which lead to the first case of the self-assembled CdN 4 O 2 polyhedra from 2D to 1D coordination polymers for 3 and 4, respectively.