Complexes of chromium(II) and iron(II) with hexamethylphosphoramide |
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| Affiliation: | 1. Institute for Technology of Radioactive and Rare Elements (ITRRE), 48 Lang Ha, Dong Da, Ha Noi, Viet Nam;2. Current Postdoctoral Fellow at Tokai Reprocessing Technology Development Center, Japan Atomic Energy Agency (JAEA), 4-33 Tokaimura, Nakagun, Ibaraki, 319-1194, Japan;3. Convergence Research Center for Development of Mineral Resources (DMR), Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 34132, South Korea;1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Box 1410, 50-950 Wrocław 2, Poland;2. Department of Bioorganic Chemistry, University of Economics, 53 345 Wroclaw, Poland;1. School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, GA 30332-0400, USA;2. Department of Chemistry, University of Rajasthan, Jaipur 302004, India;3. Department of Chemistry, New Mexico Highlands University, Las Vegas, NM 87701, USA;4. Institute of Applied Physics, Academy of Sciences of Moldova, Chişinău MD-2028, Republic of Moldova;1. Research Center of Green Pharmaceutical Technology and Process, Hubei Key Laboratory of Natural Products Research and Development, College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China;2. Institute for Molecular Science, Myodaiji, Okazaki 444-8787, Japan;1. School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, China;2. School of Materials Science and Engineering, Central South University, Changsha, Hunan, 410083, China;3. Centre for Ionics University of Malaya, Department of Physics, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia |
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| Abstract: | The chromium(II) complexes CrX2(HMPA)2, in which X = Cl or Br and HMPA is hexamethylphosphoramide, and Cr(HMPA)4(BF4)2 have been prepared. The effective magnetic moments show little deviation from the value expected for high spin chromium(II) from room temperature to liquid nitrogen temperature. The diffuse reflectance spectra suggest that the chromium ions are in a strongly distorted six coordinate environment. The iron(II) complexes, FeX2(HMPA)2, X = Br or I, and [Fe(HMPA)4](BF4)2, from their magnetic behaviour and Mössbauer and electronic spectra, contain tetrahedral iron(II). The isomer shift of the last complex is the most positive so far reported for a tetrahedral iron(II) complex. |
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