The Tuning Effect of 2‐Amino‐4,6‐dipyridylpyrimidine Isomers on the Structural Dimensionalities and Motifs of Copper(I) Cyanide Complexes

Abstract

AbstractFour novel copper(I) cyanide complexes of three isomeric oligopyridine ligands, namely 2‐amino‐4,6‐bis(2‐pyridyl)pyrimidine (L1), 2‐amino‐4‐(2‐pyridyl)‐6‐(4‐pyridyl)pyrimidine (L2), 2‐amino‐4‐(2‐pyridyl)‐6‐(3‐pyridyl)pyrimidine (L3) have been hydrothermally synthesized. These complexes have one‐ and two‐dimensional structures, as determined by single‐crystal X‐ray diffraction. The structural dimensionalities and motifs of complexes 1–4 are directed by the coordination modes of the ligands. Thus, L1 acts as a bis‐chelating ligand in complex 1 to join the adjacent 1D {CuCN}n chains into a two‐dimensional corrugated layer. Complexes 2 and 4 both consist of one‐dimensional zigzag chains where the ligands (L2 for complex 2 and L3 for complex 4) occupy the terminal positions and N···NH2 hydrogen bonds play an important role in the assembly of the supramolecular network. Complex 3 (another product isolated from the L3‐Cu‐CN reaction system) is a two‐dimensional network in which L3 acts as a bridging ligand and the cyanide groups exhibit both μ2 and μ3 linking modes. Further investigation shows that the thermal stability of complexes 1–4 is in the order 1 > 3 > 2 > 4. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)