Studies of Ferrocene

Ferrocene or (r -CjHs)2 Fe is one of the more stable organometallic compounds. It is a representative of the sandwich compounds where a metal is located between two organic ligands below and above the metal ion. The two rings of ferrocene retain most of their aromatic character and hence the extensive range of reactions of ferrocene which resemble organic reactions. 

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Welipitiya etal. [132] have studied adsorption and desorption of ferrocene on Ag(lOO), applying photoemission and thermal desorption. The initially adsorbed surface species closely resembled that of molecular ferrocene. The molecule was adsorbed with the cyclopentadienyl ring ligands parallel to the surface. Wood-bridge etal. [133] have performed the high-resolution electron energy loss spectroscopy (HREELS) andXPS studies of ferrocene on Ag(lOO). Researchers from the... 

Electrochemical study of ferrocene and nitroxide derivatives intercalated in Zn-Cr and Zn-Al layered double hydroxides. J. Electroanal. Chem. 454, 91. 

Figure 28. Cyclovoltammetric study of ferrocene-modified GPO in the absence and the presence of L-glycerol phosphate (scan rate lOmV/s reference Ag/AgCl, phosphate buffer, pH 6.8).

Studies of ferrocene polymetalation as well as the metalation of substituted ferrocenes using BuLi-TMEDA have also been reported... 

During the first normal-coordinate studies of ferrocene, the authors treated the Cp rings as separate entities [50] therefore, the effect of the changing reduced mass was not introduced in this treatment. The revision of the normal-coordinate analysis of ferrocene by Brunvoll and co-workers, based on the treatment of the ferrocene complex as a whole, has demonstrated that similar kinematic coupling effects play a significant role in the normal vibrational frequencies for ferrocene as well [43c]. This study also concluded that the differences between the frequencies of ferrocene and those of the free Cp- ring are... 

Metal Binding Studies of Ferrocene Peptides in Solution... 

The half-wave potentials for the oxidation of I" " and 2+ are shifted to more anodic values by about 80 mV upon addition of 12 equivalents of p-CD. However, similar additions of either a-CD or y-CD cause much lower potential shifts (< 20 mV). The observed potential difference between the voltammetric anodic and cathodic peak potentials (AEp) for these two ferrocene derivatives in the presence of excess p-CD is about 70 mV at moderate scan rates (20-100 mV/s). Indeed, the expected value for a fully reversible one-electron couple is 57 mV. Evans and coworkers also recorded AEp > 57 mV in their voltammetric studies of ferrocene carboxylic acid oxidation in the presence of p-CD. These authors conclusively showed that the observed peak-to-peak splittings are due to the inability of the complex to undergo oxidation directly, i.e., the dissociation of the complex must precede the electron transfer step[5]. Our data parallel exactly these authors experimental findings and we conclude that a similar mechanism prevails for the oxidation of 1" or 2 when bound to P-CD. 

Wilkinson, Sir Geoffrey (1921-96) British chemist whose main work was in the investigation of the organometallic compounds. His study of ferrocene showed that its molecule consisted of an atom of iron sandwiched between two five-sided rings of carbons and hydrogens. Thousands of substances with this kind of structure have since been synthesized and found to be of great chemical importance. He was awarded the 1973 Nobel Prize in chemistry with Ernst Fischer. 

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