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|Section2= |Section3= }} Manganocene or bis(cyclopentadienyl)manganese(II) is an organomanganese compound with the formula ()n. It is a thermochromic solid that degrades rapidly in air. Although the compound is of little utility, it is often discussed as a example of a metallocene with ionic character.〔Richard A. Layfield "Manganese(II): the black sheep of the organometallic family" Chem. Soc. Rev., 2008, vol. 37, pp. 1098-1107.〕 ==Synthesis and structure== It may be prepared in the manner common for other metallocenes, i.e., by reaction of manganese(II) chloride with sodium cyclopentadienide: : MnCl2 + 2 CpNa → Cp2Mn + 2 NaCl In the solid state below -159 °C, manganocene adopts a polymeric structure with every manganese atom coordinated by three cyclopentadienyl ligands, two of which are bridging ligands. Above -159 °C, the solid changes color from amber to pink and the polymer converts to the structure of a normal sandwich complex, i.e., the molecule Mn(η5-C5H5)2.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Manganocene」の詳細全文を読む スポンサード リンク
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