Self-assembly of coordination polymers constructed from CuCN and unidentate pyridine bases

摘要

The self-assembly of K₃[Cu(CN)₄] and unidentate pyridine bases (L): pyridine (py), 3-methyl pyridine (3-mpy), and 2,4,6-trimethyl pyridine (tmpy) in the presence of Me₃SnCl affords new coordination polymers (CPs) CuCN·0.5(py)] (1), [CuCN·0.5(3-mpy)] (2), and [CuCN·0.5(tmpy)] (3). The syntheses are achieved in H₂O/acetonitrile media at room temperature. The structure of the CP 3 was characterized by X-ray single crystal analysis. It is crystallized as orthorhombic in the space group Pnma, a = 9.1065 (3) Å, b = 8.6669 (3) Å, and c = 12.1998 (5) Å and Z = 8. The CPs 1, 2 were investigated by IR, mass, Uv–visible, and 1H-NMR spectra, as well as TGA. The CPs 1–3 are 2D-polymers consisting of 1D-(CuCN) _n chain structure while the ligands alternate on both sides of the chain with associated copper atom coordination number of three. Hydrogen bonds play an essential role for developing 2D-network structure. These CPs exhibit strong fluorescent emissions in the solid state.