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Journal of Coordination Chemistry Volume 67, 2014 - Issue 5
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Original Articles

Homochiral imidazole-based dicarboxylate metal complexes with SrSi2 topology: synthesis, crystal structures, and properties

Li SunDepartment of Chemistry, North University of China, Taiyuan, PR China
,
Jiang-Feng SongDepartment of Chemistry, North University of China, Taiyuan, PR ChinaCorrespondence[email protected]
,
Rui-Sha ZhouDepartment of Chemistry, North University of China, Taiyuan, PR China
,
Jia ZhangDepartment of Chemistry, North University of China, Taiyuan, PR China
,
Lu WangDepartment of Chemistry, North University of China, Taiyuan, PR China
,
Kun-Li CuiDepartment of Chemistry, North University of China, Taiyuan, PR China
&
Xiao-Yu XuDepartment of Public Security of Jilin Province, Changchun, PR China
 show all
Pages 822-836 | Received 13 Jan 2013, Accepted 04 Jan 2014, Published online: 04 Apr 2014
 
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Abstract

Two new complexes with homochiral frameworks, {Co3(EIDC)2(H2O)5}n (1) and {Zn3(EIDC)2(H2O)4}n (2) (H3EIDC = 2-ethyl-1H-imidazole-4,5-dicarboxylic acid), have been synthesized from achiral starting precursors via spontaneous resolution and fully characterized by elemental analyses, IR, circular dichroism, photoluminescence (PL) spectroscopy, single-crystal X-ray diffraction, and thermogravimetric analysis. X-ray diffraction data revealed that 1 and 2 have SrSi2 topologies and that both are homochiral metal–organic frameworks. Compound 1 is constructed by left-handed chiral chains; however, right-handed chains constitute the homochiral framework of 2. Variable temperature magnetic susceptibility measurements of 1 indicate strong antiferromagnetic interactions between the magnetic Co centers. Compound 2 exhibited weak blue PL in the solid state at room temperature.

Graphical Abstract

Two novel homochiral frameworks with SrSi2 topology, {Co3(EIDC)2(H2O)5}n (1) and {Zn3(EIDC)2(H2O)4}n (2) (H3EIDC = 2-ethyl-1H-imidazole-4,5-dicarboxylic acid), have been synthesized from totally achiral starting precursors via spontaneous resolution. The homochiral natures of 1 and 2 were further confirmed by circular dichroism spectra.

Funding

This work was supported by the National Natural Science Foundation of China [grant number 21201155]; the Natural Science Young Scholars Foundation of Shanxi Province [grant numbers 2012021007-5, 2013021008-6]; Program for the Top Young Academic Leaders of Higher Learning Institutions of Shanxi, respectively.

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