|Molar mass||185.13 g·mol−1|
|Appearance||amber solid < 159 °C, pink > 159 °C|
|Melting point||175 °C (347 °F; 448 K)|
|Boiling point||245 °C (473 °F; 518 K)|
EU classification (DSD)
|R-phrases||R11, R14, R20/21/22, R36/37/38|
|S-phrases||S16, S26, S36/37/39|
|Flash point||52 °C (126 °F; 325 K)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Manganocene or bis(cyclopentadienyl)manganese(II) is an organomanganese compound with the formula [Mn(C5H5)2]n. It is a thermochromic solid that degrades rapidly in air. Although the compound is of little utility, it is often discussed as an example of a metallocene with ionic character.
Synthesis and structure
- 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.
- Richard A. Layfield "Manganese(II): the black sheep of the organometallic family" Chem. Soc. Rev., 2008, vol. 37, pp. 1098-1107.doi:10.1039/B708850G
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