Synthesis, Crystal Structures and Catalytic Activities of Two Copper Coordination Compounds Bearing an N,N’-Dibenzylethylenediamine Ligand

Chao Liu,Weiwei Zhang,Gaigai Cai

doi:10.3390/cryst10060528

Abstract

Two copper coordination compounds bearing an N,N’-dibenzylethylenediamine ligand, namely [Cu3L(CH3COO)6]n (1) and [(CuCl4)∙(C6H5CH2NH2CH2)2] (2) (L = N,N’-dibenzylethylenediamine) were synthesized by the ethanol refluxing method. Powder X-ray diffraction (PXRD), infrared spectra (IR), elemental analyses, and single crystal X-ray diffraction were used to characterize and verify their structures. Structural analyses showed that the asymmetric unit of compound (1), composed of two Cu(II) cations, three acetate anions, and half of the ligand, was bridged by one acetate to obtain an infinite 1D chain structure. The analyses further showed that the asymmetric unit of compound (2), composed of two crystallographically independent [C6H5CH2NH2CH2]+ units, four chloride anions, and one central Cu(II) cation is connected into an infinite 2D network structure by the hydrogen bonding interactions. The copper compounds were used to catalyze the decomposition of H2O2, and the results showed that both of the compounds exhibited excellent catalytic activities under optimized conditions.

Highlights

Among transition metal coordination compounds, copper coordination compounds occupy a vital position in organometallic chemistry due to their abundant coordination structures and potential applications in various fields [1,2,3,4,5]
To develop novel and efficient catalysts, copper ions coordinated to a suitable ligand with multiple coordination sites and strong coordination abilities have been assembled into different copper coordination compounds [10,11]
Diamine and its derivatives are an important class of organic compounds with highly flexible N,N-donor atoms that can coordinate to different metal ions, producing a variety of mononuclear [12,13,14], binuclear [15,16,17], and polynuclear metal coordination compounds with excellent catalytic activities [18,19,20]

Summary

Introduction

Among transition metal coordination compounds, copper coordination compounds occupy a vital position in organometallic chemistry due to their abundant coordination structures and potential applications in various fields [1,2,3,4,5]. The catalytic activities of copper coordination compounds with various organic ligands have attracted extensive attention from chemists [6,7,8,9]. Diamine and its derivatives are an important class of organic compounds with highly flexible N,N-donor atoms that can coordinate to different metal ions, producing a variety of mononuclear [12,13,14], binuclear [15,16,17], and polynuclear metal coordination compounds with excellent catalytic activities [18,19,20]. Metal oxides, metal salts, and some coordination compounds have been used to catalyze the decomposition reaction of H2O2, and considerable results have been obtained [28,29,30].

Methods

Results

Conclusion