Synthesis and multinuclear NMR data of the ferrocenes (Me3Ecp)2Fe (E = C,Si, Ge,Sn, Pb) |
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| Affiliation: | 1. A. Mickiewicz University, Faculty of Chemistry, Umultowska 89b, 61-614 Poznan, Poland;2. Department of Chemistry and Centers for Advanced Materials and High-Rate Nanomanufacturing, The University of Massachusetts Lowell, Lowell, MA 01854, United States;1. R&D Center of Lubricating and Protecting Materials, Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;2. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA;3. School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, PR China;4. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Department of Microbiology, Vidyasagar University, Midnapore, West Bengal, India;2. Omics Laboratory, Department of Biotechnology, University of North Bengal, Siliguri, West Bengal, India;3. Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore, West Bengal, India;4. Immunology and Microbiology Laboratory, Department of Human Physiology with Community Health, Vidyasagar University, Midnapore, West Bengal, India;1. Department of Chemistry, Payame Noor University (PNU), 19395-4697 Tehran, Iran;2. Department of Crystallography, Institute of Chemistry, University of Silesia, ul. Szkolna 9, 40-006 Katowice, Poland;1. Departamento de Química Inorgánica y Química Técnica, Universidad Nacional de Educación a Distancia, UNED, Paseo Senda del Rey 9, E-28040 Madrid, Spain;2. Adam Mickiewicz University, Faculty of Chemistry, Umultowska 89b, 61-614 Poznan, Poland;1. Ministry of Education Key Laboratory of Interface Science and Engineering in Advanced Materials, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan, 030024, China;2. State Key Laboratory for THz and Millimeter Waves and Department of Materials Science & Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong |
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| Abstract: | The substituted cyclopentadienyl anions Me3Ecp− with E = C, Si, Ge, Sn, Pb have been prepared from either the mono- or disubstituted cyclopentadienes, including the hitherto unknown (Me3Pb)2C5H4. Representative examples have been characterized by 13C NMR spectroscopy. Treatment with iron(II) chloride yielded the ferrocenes (Me3Ecp)2Fe, which have been investigated by 1H, 13C, 29Si, 119Sn, and 207Pb NMR spectroscopy. 13C13C coupling and selective proton decoupling were used for the assignment of the 13C and 1H signals. The shifts δ(13C) reflect the electron-releasing or -withdrawing power of the substituents Me3E, but the isotope shifts 1Δ13C(i)(13C(j)) do not show a similar trend. There is evidence that δ(119Sn) and δ(207Pb) are influenced by the coordination. The analysis of the coupling constants reveals that 1J(13C(1)13C(2/5)) varies with the electronegativity of E. Because of the small range (4.5–5.0 Hz) of 1J(57Fe13C) the effect of E is apparent only when E = C is replaced by E = Si. As for the coupling between E and 13C or 1H, the square root of the reduced coupling constant K is related linearly to the atomic number of E; exceptions are 1K(207Pb13C). |
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