FULL PAPER 1D Azido bridged Cu(II) coordination polymer with 1,3-oxazolidine ligand as an effective catalyst for green click synthesis of 1,2,3-triazoles Rahman Bikas 1 | Fatemeh Ajormal 2 | Nader Noshiranzadeh 2 | Marzieh Emami 2 | Anna Kozakiewicz 3 1 Department of Chemistry, Faculty of Science, Imam Khomeini International University, Qazvin, 34148-96818, Iran 2 Department of Chemistry, Faculty of Science, University of Zanjan, Zanjan, 45371-38791, Iran 3 Department of Biomedical and Polymer Chemistry, Faculty of Chemistry, Nicolaus Copernicus University in Torun, Torun, 87-100, Poland Correspondence Department of Chemistry, Faculty of Science, Imam Khomeini International University, 34148-96818, Qazvin, Iran. Email: bikas@sci.ikiu.ac.ir; bikas_r@ yahoo.com A new 1D azido bridged Cu(II) coordination polymer with 1,3-oxazolidine based ligand, [Cu(H 3 L)(μ 1,3 -N 3 )(N 3 )] n (1), was synthesized and characterized by elemental analysis and spectroscopic methods. The structure of 1 was also determined by single crystal X-ray analysis which indicated the 1D polymeric chain is generated by end-to-end (EE) azide bridge. The obtained compound was employed as catalyst in green click synthesis of β-hydroxy-1,2,3-triazoles from one-pot three-component cycloaddition reaction of epoxide-azide-alkyne. The catalytic reactions were carried out in water as a safe, cheap and green solvent. The catalytic studies indicated that the obtained 1D azido bridged Cu(II) coordination polymer is an active catalyst for preparing β-hydroxy- 1,2,3-triazoles. The effect of temperature on the selectivity of the catalytic system was studied and the results indicated this catalytic system has high selectivity at low temperatures. The structure the product obtained from the reaction of 2,3-epoxypropylphenylether, azide and 1-ethynyl-1-cyclohexanol (T4) was determined by single crystal X-ray analysis. The results indicate Cu(II) coordination polymers can be a new class of catalytic systems for green click synthesis of 1,2,3-triazoles. KEYWORDS 1,2,3-triazole, click reaction, crystal structure, Cu(II) coordination polymer, cycloaddition 1 | INTRODUCTION During the last decade widespread researches have been done to design, synthesis and characterization of coordi- nation polymers and metal organic frameworks. This matter can be attributed to the diverse applications of coordination polymers in various fields beside their struc- tural beauties and appealing features. [1] These materials have found several applications in fields like catalysts, [2] magnetic materials, [3] drug delivery, [4] bioinorganic chemistry, [5] energy conversion and storage, [6] medicine, [7] sensor science, [8] optical materials [9] and many other fields. Generally, self-assembly of suitable ligands with metal ions in a solvent is the common and comprehensive methods for production of coordination polymers. [10] Nevertheless, researchers have employed diverse methods for this matter and various ligands have been employed to prepare coordination polymers. [11] Among the various methods to achieve coordination polymers, the use of a mixture of organic ligands with suitable bridging groups is one of the effective and suc- cessful methods for this matter. [12] Azide is one of the attractive bridging ligands for the synthesis of coordina- tion polymers because it has several bridging and Received: 24 March 2020 Revised: 29 April 2020 Accepted: 2 May 2020 DOI: 10.1002/aoc.5826 Appl Organomet Chem. 2020;e5826. wileyonlinelibrary.com/journal/aoc © 2020 John Wiley & Sons, Ltd. 1 of 12 https://doi.org/10.1002/aoc.5826