A new binuclear Cr(III) citrate anion: Synthesis,characterization and crystal structure of [Cr(CO(NH2)2)6]2[Cr2(CO(NH2)2)2(C6H4O7)2]3 |
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| Affiliation: | 1. Department of Chemistry, UGC Centre for Advanced Studies-1, Guru Nanak Dev University, Amritsar-143005, Punjab, India;2. Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ašerčeva 5, 1000, Ljubljana, Slovenia;1. State Key Laboratory of Natural Medicines & Jiangsu Provincial Key laboratory for TCM Evaluation and Translational Development, China Pharmaceutical University, Nanjing, Jiangsu 211198, China;2. State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People''s Republic of China |
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| Abstract: | The new anion [Cr2(CO(NH2)2)2(C6H4O7)2]2 − has been isolated in the complex [Cr(CO(NH2)2)6]2[Cr2(CO(NH2)2)2(C6H4O7)2]3. The crystals of this complex were obtained by a one-pot synthetic method using 1:1 molar ratio of hexaureachromium(III) chloride and trisodium citrate in aqueous medium. It was characterized by elemental analysis, IR spectroscopy and single crystal X-ray diffraction analysis. The compound crystallizes in space group R‾3 of the trigonal system with three formula units in a cell of dimensions a = b = 24.7461(4) Å, c = 13.7204(3) Å and γ = 120°. The crystal structure comprises the columns consisting of [Cr(CO(NH2)2)6]3 + cations surrounded by a cylinder of complex anions, [Cr2(CO(NH2)2)2(C6H4O7)2]2 − which are packed in a honeycomb-like manner. This supramolecular architecture is formed and stabilized by inter- and intramolecular N H⋯O hydrogen bonds. |
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