Cyclopentadienyl and Arene Metal Compounds

Wilkinson, Geoffrey; Cotton, F. Albert

doi:10.1002/9780470166024.ch1

Cited by 104 publications

(13 citation statements)

References 243 publications

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“…The cobalticinium salts are exceptionally stable in water [68]. The simple application of a metallic cation between the two aromatic rings has three important consequences for the investigation of biological systems:…”

Section: Anion and Cation Radicals Formed In Metallocenesmentioning

confidence: 99%

Radical Mechanisms in the Metallocenes

Çalişkan¹

2017

Recent Progress in Organometallic Chemistry

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A special class of sandwich complexes is the metallocenes. The best-known members are the metallocenes of the formula M(C 5 H 5) 2 , where M = zirconium, zinc, titanium, hafnium, vanadium, chromium, molybdenum, tungsten, manganese, iron, ruthenium, osmium, cobalt, rhodium, and nickel. Besides the two cyclopentadienyl rings, the metal can have additional ligands depending on its valence state. These species are also called bis(cyclopentadienyl)metal complexes. Bis(cyclopentadienyl) complexes are called metallocenes or sandwich compounds. Metal-centred radical and cyclopentadienyl radical structures can occur in the metallocene. The anion and cation radicals can also be formed by charge transfer transition.

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Section: Anion and Cation Radicals Formed In Metallocenesmentioning

confidence: 99%

Radical Mechanisms in the Metallocenes

Çalişkan¹

2017

Recent Progress in Organometallic Chemistry

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“…, Li + , Na + , and K + ) provide the highest OH − conductivity and show excellent stability, but at present cannot be covalently tethered to a polymer backbone for HEM applications 35 . Organic bis(cyclopentadienyl) metallocenium cations based on VIIIB family metals [(C 5 H 5 ) 2 M(III) + or Cp 2 M(III) + , M = Co, Rh, Ir, or Mt] satisfy the 18-valence electron stability rule and resemble alkali metal cations: They bear one unit of positive charge, may be precipitated by the addition of excess anions, and with hydroxide as counter-ion absorb CO 2 and water from ambient air 36 . In particular, cobalt is the smallest atom in the VIIIB family and forms the strongest metal-ring bonds, resulting in the most stable metallocenium cation, Cp 2 Co + (cobaltocenium) 37 .…”

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confidence: 99%

Permethyl Cobaltocenium (Cp*2Co+) as an Ultra-Stable Cation for Polymer Hydroxide-Exchange Membranes

Wang

Kaspar

et al. 2015

Sci Rep

124

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Hydroxide (OH−)-exchange membranes (HEMs) are important polymer electrolytes enabling the use of affordable and earth-abundant electrocatalysts for electrochemical energy-conversion devices such as HEM fuel cells, HEM electrolyzers, and HEM solar hydrogen generators. Many HEM cations exist, featuring desirable properties, but new cations are still needed to increase chemical stability at elevated temperatures. Here we introduce the permethyl cobaltocenium [(C5Me5)2Co(III)+ or Cp*2Co+] as an ultra-stable organic cation for polymer HEMs. Compared with the parent cobaltocenium [(C5H5)2Co(III)+ or Cp2Co+], Cp*2Co+ has substantially higher stability and basicity. With polysulfone as an example, we demonstrated the feasibility of covalently linking Cp*2Co+ cation to polymer backbone and prepared Cp*2Co+-functionalized membranes as well. The new cation may be useful in designing more durable HEM electrochemical devices.

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“…The decrease in extraction is quite drastic for scandium(III), titanium(lV), zirconium(IV), thorium(IV), uranium(Vl), zinc(II), and tin(IV). Table 7 compares the ionic radii of metals (65,67) and the relative extent of their extraction by BOSM compared to DOSO. Table 10 lists the results of the extractions.…”

Section: The Very Strong Extraction Of Iron(iii) and Ruthenium(iii) Ismentioning

confidence: 99%

Sulfoxides as solvent extraction reagents for the analytical separation of metal ions

Kennedy¹

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Cyclopentadienyl and Arene Metal Compounds

Cited by 104 publications

References 243 publications

Radical Mechanisms in the Metallocenes

Radical Mechanisms in the Metallocenes

Permethyl Cobaltocenium (Cp*2Co+) as an Ultra-Stable Cation for Polymer Hydroxide-Exchange Membranes

Sulfoxides as solvent extraction reagents for the analytical separation of metal ions

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