Synthesis and structural characterization of three saccharinate–metal complexes with exo-bidentate bis(imidazole) derivatives

Abstract

Three coordination compounds, [Ag₂(L¹)(sac)₂] · 5(H₂O) (1, L¹= bis(N-imidazolyl)methane, sac = saccharinate), [Ag(L²)(sac)], (2, L²= 1,4-bis(N-imidazolyl)butane), and [Cu(L²)₂(H₂O)₂](sac)₂ · 2(H₂O) (3), were obtained from self-assembly of the metal salts with bis-imidazole ligands in the presence of saccharinato ion. All products were formed in solution and obtained by slow evaporation. Their structures were fully characterized by X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy, elemental analysis, and thermogravimetric analyses. Compound 1 is a linear dinuclear complex, consisting of two Ag(sac) units bridged by a bis(N-imidazolyl)methane, while 2 is a tri-coordinated Ag(I) complex, with Ag(I) surrounded by three nitrogens in trigonal plane geometry. Compound 2 displays a 1-D wavy chain structure. XRD analysis revealed that 3 exhibits 1-D cationic double-stranded chain structure from doubly bridged [Cu(H₂O)₂] units. All these complexes display 3-D framework structures from a number of non-conventional weak interactions. IR spectra, elemental analyses, and thermal analyses are in good agreement with the crystal structure.

Keywords:

• Silver(I)
• Copper(II)
• Bis-imidazole
• Saccharinate
• Crystal and molecular structure

Acknowledgments

We gratefully acknowledge the financial support of the Education Office Foundation of Zhejiang Province (project No. Y201017321) and from Rongkang Industry CO., Limited, HangZhou and MeiTe Industry CO., Limited, HangZhou, ZhengJiang.