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Metallocene
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===NMR (<sup>1</sup>H and <sup>13</sup>C) [[spectroscopy]] of metallocenes=== [[Nuclear magnetic resonance]] (NMR) is the most applied tool in the study of metal sandwich compounds and organometallic species, giving information on nuclear structures in solution, as liquids, gases, and in the solid state. <sup>1</sup>H NMR chemical shifts for paramagnetic organotransition-metal compounds is usually observed between 25 and 40 ppm, but this range is much more narrow for diamagnetic metallocene complexes, with chemical shifts usually observed between 3 and 7 ppm.<ref name="Metallocenes"/>
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