A linear Cu (II) coordination polymer based on a simple click chelator

A linear Cu(II) coordination polymer [CuCl2Cu(N3)2 L] (L = 2-[(4-phenyl-5 H-1,2,3-triazole)methyl]pyridine) (1) has been synthesized. The crystal structure is determined by the single crystal X-ray diffraction. It is found that Cu(II) cations in 1 are bridged with four types of ligand or anions, 1,2,3-triazole group in L, two different End-Open azides and a tri-coordinated chloride anion. Among them L simultaneously behaves as a chelator and a bridge, in which the N2 and N3 atoms of 1, 2, 3-triazole group coordinate to different Cu(II) cations. The Cu(II) centers exhibit two different coordination geometries in 1. One Cu(II) cation adopts a distorted octahedral geometry and the other adopts a distorted square pyramidal geometry. The magnetic measurement indicates that 1 exhibits the paramagnetism with anti-ferromagnetic interaction among the Cu(II) spins.