Esterification of the ligand: Synthesis, characterization and crystal structure of a iron(III) 18-metallacrown-6 complex with methyl 4-(5′-chlorosalicylhydrazinocarbonyl) butyrate
作者:Cheng-Zhi Jin、Shu-Xiang Wu、Long-Fei Jin、La-Mei Wu、Jian Zhang
DOI:10.1016/j.ica.2011.10.021
日期:2012.3
The multidentate ligand, 4-(5'-chlorosalicylhydrazinocarbonyl) butyric acid, has been synthesized and reacted with FeCl3 to produce the iron(III) 18-metallacrown-6 complex [Fe-6(III)(C13H12N2O5Cl)(6)(CH3OH)(6)]center dot 5CH(3)OH. In the complex the ligand 4-(5'-chlorosalicylhydrazinocarbonyl) butyric acid was esterified and transferred into methyl 4-(5'-chlorosalicylhydrazinocarbonyl) butyrate. In the crystal structure, the hexanuclear 18-membered rings of iron atoms are linked by six hydrazide N-N groups. The deprotonated and esterified ligand acts as a trianionic pentadentate ligand, one phenolate oxygen, one hydrazide nitrogen and one carbonyl oxygen in the ligand are bound to one Fe3+ cation, and the other carbonyl oxygen plus the other hydrazide nitrogen in the same ligand are chelated to an adjacent Fe3+ cation. In hydrochloric acid the metallacrown [Fe-6(III)(C13H12N2O5Cl)(6)(CH3OH)(6)]center dot 5CH(3)OH can be treated with SnCl2 to obtain purified ester methyl 4-(5'-chlorosalicylhydrazinocarbonyl) butyrate. (C) 2011 Elsevier B. V. All rights reserved.