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A new member of tetranuclear dinitrosyl iron complexes (DNICs) with 2-mercaptothiazoline ligand: synthesis,structure and properties |
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| Authors: | Chien-Hong Chen Jheng-Hong Wang Jing-Yi Huang Chung-Hung Hsieh |
| Institution: | 1. School of Applied Chemistry, Chung Shan Medical University, Taichung, 40201, Taiwan 2. Department of Medical Education, Chung Shan Medical University Hospital, Taichung, 40201, Taiwan 3. Department of Chemistry, Tamkang University, New Taipei City, 25137, Taiwan |
| Abstract: | A new tetranuclear dinitrosyliron complex (μ-SC3H4SN)Fe(NO)2]4 (2), each of a Fe center coordinated with two S or two N, was prepared by CO replacement from the reduced precursor (CO)2Fe(NO)2 with 1 equiv of HSC3H4SN (2-mercaptothiazoline) in the presence of O2(g). The structure of 2 is similar to (Imid-iPr)Fe(NO)2]4 (Imid-iPr = 2-isopropylimidazole) (Hess et al. J Am Chem Soc 133:20426–20434, 2011), and both complexes comprise a quadrilateral plane of irons with corresponding ligands, SC3H4SN? or Imid-iPr?, bridging the edges and two nitrosyl ligands capping the irons at the corners. An additional equiv of SC3H4SN? was added to 2, which results in the mononuclear {Fe(NO)2}9 (SC3H4SN)2Fe(NO) 2 ? (3), in the manner of N bound-SC3H4SN]. Reaction of (TMEDA)IFe(NO)2 (TMEDA = tetramethylethylenediamine) and complex 3 leads to the formation of complex 2. Dinuclear complex (μ-C5H7N2)Fe(NO)2]2 (4) can be synthesized by the ligand displacement of SC3H4SN? to C5H7N2 ? (3,5-dimethylpyrazolate) of 2 (Chong et al. Can J Chem 57:3119–3125, 1979). Complexes 2–4 were characterized by IR and UV–Vis. The molecular structures of 2 and 3 were determined by X-ray single crystal diffraction. |
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