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Cobaltocene information


Cobaltocene
Skeletal formula of cobaltocene
Skeletal formula of cobaltocene
Ball-and-stick model of cobaltocene
Ball-and-stick model of cobaltocene
Names
IUPAC names
Cobaltocene
Bis(η5-cyclopentadienyl)cobalt
Other names
Cp2Co
Identifiers
CAS Number
  • 1277-43-6 checkY
3D model (JSmol)
  • Interactive image
ChEBI
  • CHEBI:30678 ☒N
ChemSpider
  • 83848 checkY
ECHA InfoCard 100.013.692 Edit this at Wikidata
EC Number
  • 215-061-0
PubChem CID
  • 22045960
RTECS number
  • GG0350000
UNII
  • 4W7LGU89CV checkY
CompTox Dashboard (EPA)
  • DTXSID0024840 Edit this at Wikidata
InChI
  • InChI=1S/2C5H5.Co/c2*1-2-4-5-3-1;/h2*1-5H;/q2*-1;+2 checkY
    Key: ILZSSCVGGYJLOG-UHFFFAOYSA-N checkY
  • InChI=1/2C5H5.Co/c2*1-2-4-5-3-1;/h2*1-5H;/q2*-1;+2
    Key: ILZSSCVGGYJLOG-UHFFFAOYAM
SMILES
  • [cH-]1cccc1.[cH-]1cccc1.[Co+2]
Properties
Chemical formula
[Co(η5-C5H5)2]
Molar mass 189.12 g/mol
Appearance Dark purple solid
Melting point 171–173 °C (340–343 °F; 444–446 K)
Solubility in water
Insoluble
Structure
Coordination geometry
sandwich
Dipole moment
zero
Thermochemistry
Std molar
entropy (S298)
236 J K−1 mol−1
Std enthalpy of
formation fH298)
+237 kJ/mol (uncertain)
Std enthalpy of
combustion cH298)
−5839 kJ/mol
Hazards
GHS labelling:
Pictograms
GHS02: FlammableGHS08: Health hazard[1]
Signal word
Danger[1]
Hazard statements
H228, H317, H351[1]
Precautionary statements
P210, P261, P280, P363, P405, P501[1]
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuelInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
2
0
Safety data sheet (SDS) External SDS
Related compounds
Related metallocenes
Ferrocene
Nickelocene
Rhodocene
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Cobaltocene, known also as bis(cyclopentadienyl)cobalt(II) or even "bis Cp cobalt", is an organocobalt compound with the formula Co(C5H5)2. It is a dark purple solid that sublimes readily slightly above room temperature. Cobaltocene was discovered shortly after ferrocene, the first metallocene. Due to the ease with which it reacts with oxygen, the compound must be handled and stored using air-free techniques.

  1. ^ a b c d "Bis(cyclopentadienyl)cobalt(II)". American Elements. Retrieved 2018-08-24.

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Cobaltocene

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Cobaltocene, known also as bis(cyclopentadienyl)cobalt(II) or even "bis Cp cobalt", is an organocobalt compound with the formula Co(C5H5)2. It is a dark...

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Cyclopentadienyl complex

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which has many analogues for other metals, such as chromocene (CrCp2), cobaltocene (CoCp2), and nickelocene (NiCp2). When the Cp rings are mutually parallel...

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Alkali metal

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are characterised. Cobaltocene, Co(C5H5)2, is a metallocene, the cobalt analogue of ferrocene. It is a dark purple solid. Cobaltocene has 19 valence electrons...

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Nickelocene

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has the highest electron count of the transition metal metallocenes. Cobaltocene, Co(C5H5)2, with only 19 valence electrons is, however, a stronger reducing...

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Cobalt

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yellow-gold needle-like crystals. Cobaltocene is a structural analog to ferrocene, with cobalt in place of iron. Cobaltocene is much more sensitive to oxidation...

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Decamethylcobaltocene

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CoCp*2 The permethylated form is more air-sensitive than the parent cobaltocene, owing to the inductive effects of methyl groups. It is a thermally stable...

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Ferrocene

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was diamagnetic and centrosymmetric, also synthesizing nickelocene and cobaltocene and confirming they had the same structure. Fischer described the strcuture...

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Reference electrode

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mentioned above. A QRE with ferrocene or another internal standard, such as cobaltocene or decamethylferrocene, referenced back to ferrocene is ideal for nonaqueous...

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Organometallic chemistry

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archetypal organoiron complex. It is an air-stable, sublimable compound. Cobaltocene is a structural analogue of ferrocene, but is highly reactive toward...

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Ernst Otto Fischer

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the structural data of ferrocene and the new complexes nickelocene and cobaltocene. Near the same time, he focused also on the then baffling chemistry resulting...

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D electron count

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unpaired electron, paramagnetic, substitutionally labile. Examples: cobaltocene. d8 Complexes which are d8 high-spin are usually octahedral (or tetrahedral)...

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Rhodocene

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octaphenylrhodocene has a sandwich structure with a staggered conformation. Unlike cobaltocene, which has become a useful one-electron reducing agent in research, no...

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List of compounds with carbon number 10

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dichloride 12793-14-5 C10H10Cl2Ti titanocene dichloride 1271-19-8 C10H10Co cobaltocene 1277-43-6 C10H10F6FeP ferrocenium hexafluorophosphate 11077-24-0 C10H10Fe...

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Cobalt compounds

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NaCo(CO)4. It is a catalyst in carbonylation and hydrosilylation reactions. Cobaltocene (Co(C5H5)2) is a cyclopentadiene complex of cobalt. It has 19 valence...

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Christina Moberg

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Royal Institute of Technology. Her doctorate considered nickelocene, cobaltocene and cyclopentadienyl (tributylphosphine)-copper in organic synthesis...

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Fulleride

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treating with suitable organic and organometallic reducing agents, such as cobaltocene and tetrakisdimethylaminoethylene. alkali metal fullerides can be subjected...

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Organocobalt chemistry

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alkene, allyl, diene, and Cp ligands. A famous sandwich compound is cobaltocene, a rare example of low-spin Co(II) complex. This 19-electron metallocene...

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NMR line broadening techniques

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electron transfer: comparisons of self-exchange kinetics for cobaltocenium-cobaltocene and related redox couples with theoretical predictions" (PDF). The Journal...

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Metallodendrimer

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M(II) monomers. Ferrocene-containing dendrimers and dendrimers with cobaltocene and arylchromiumtricarbonyl units have been reported in end-functional...

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Cyclopentadienylcobalt dicarbonyl

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generated by the high pressure carbonylation of bis(cyclopentadienyl)cobalt (cobaltocene) at elevated temperature and pressures: Co(C5H5)2 + 2 CO → C5H5Co(CO)2...

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Ruthenocene

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H335 NFPA 704 (fire diamond) 2 0 0 Related compounds Related compounds cobaltocene, nickelocene, chromocene, ferrocene, osmocene, bis(benzene)chromium Except...

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Vertically aligned carbon nanotube arrays

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consequently lower growth rates. Solid organometallocenes such as ferrocene, cobaltocene, nickelocene are also common catalysts. It is found that the temperature...

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IUPAC nomenclature of inorganic chemistry 2005

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the criteria are: vanadocene, [V(η5-C5H5)2] chromocene, [Cr(η5-C5H5)2] cobaltocene, [Co(η5-C5H5)2] rhodocene, [Rh(η5-C5H5)2] nickelocene, [Ni(η5-C5H5)2]...

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Transition metal indenyl complex

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Pauson and Wilkinson. The cobalt derivative is a poorer reductant than cobaltocene. The indenyl effect was discovered by Hart-Davis and Mawby in 1969 through...

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