1D Copper(I) Coordination Polymer [Cu2(µ-(2,4-Cl-ba)2bn)(µ-I2)]n with a Flexible Schiff Base Ligand: Synthesis, Crystal Structure, and Thermal Stability

Abstract

In this paper, bis-monodentate Schiff base ligand (2,4-Cl-ba)₂bn and its 1D copper(I) coordination polymer [Cu₂(μ-(2,4-Cl-ba)₂bn)(μ-I₂)]_n are synthesized and characterized by the elemental analysis (CHN), FT-IR and ¹H NMR spectroscopy. Their crystal structure is determined from the single crystal X-ray diffraction analysis. The thermal behavior of the complex is studied using thermogravimetry in order to evaluate its thermal stability and thermal decomposition pathway. The X-ray results show that the free Schiff base ligand (2,4-Cl-ba)₂bn is centrosymmetric and coordinated to copper(I) ions via two iminic nitrogen atoms as a bis-monodentate bridging ligand. The coordination geometry around the copper ions is a distorted triangle formed by one nitrogen and two iodine atoms. The distance between the two symmetry-related copper atoms is very short: 2.4756(8) Å.