Manganocene
Encyclopedia
Manganocene or bismanganese(II) is an organometallic compound of manganese
. It is a metallocene
.
In the solid state, manganocene adopts a polymeric structure with every manganese atom coordinated by three cyclopentadienyl ligands, two of which are bridging ligands. This compound has an electron count of 17; it is readily reduced to Cp2Mn−, which has an ideal electron count of 18 (see 18-electron rule
).
This metallocene is commercially available. It may be prepared in the conventional fashion, by reaction of manganese(II) chloride
with sodium cyclopentadienide
:
Manganese
Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a free element in nature , and in many minerals...
. It is a metallocene
Metallocene
A metallocene is a compound typically consisting of two cyclopentadienyl anions bound to a metal center in the oxidation state II, with the resulting general formula 2M. Closely related to the metallocenes are the metallocene derivatives, e.g. titanocene dichloride, vanadocene dichloride...
.
In the solid state, manganocene adopts a polymeric structure with every manganese atom coordinated by three cyclopentadienyl ligands, two of which are bridging ligands. This compound has an electron count of 17; it is readily reduced to Cp2Mn−, which has an ideal electron count of 18 (see 18-electron rule
18-Electron rule
The 18-electron rule is a rule of thumb used primarily for predicting formulas for stable metal complexes. The rule rests on the fact that valence shells of a transition metal consists of nine valence orbitals, which collectively can accommodate 18 electrons either as nonbinding electron pairs or...
).
This metallocene is commercially available. It may be prepared in the conventional fashion, by reaction of manganese(II) chloride
Manganese(II) chloride
Manganese chloride describes a series of compounds with the formula MnCl2x, where the value of x can be 0, 2, or 4. The tetrahydrate is the most common form of "manganese chloride". MnCl2·4H2O, but the anhydrous form and dihydrate MnCl2·2H2O are also known...
with sodium cyclopentadienide
Sodium cyclopentadienide
Sodium cyclopentadienide is an organosodium compound with the formula C5H5Na. The compound is often abbreviated as NaCp or CpNa, where Cp− is the cyclopentadienide anion. Cp is also used as an abbreviation for the cyclopentadienyl ligand in coordination chemistry.-Preparation:Sodium...
:
- MnCl2 + 2 CpNa → Cp2 Mn + 2 NaCl