Showing papers on "Ferrocene published in 1988"
631 citations
TL;DR: The direct electrochemistry of redox proteins has been achieved at a variety of electrodes, including modified gold, pyrolytic graphite and metal oxides, and a new generation of electrochemical biosensors employs ferrocene derivatives as mediators.
Abstract: The direct electrochemistry of redox proteins has been achieved at a variety of electrodes, including modified gold, pyrolytic graphite and metal oxides. Careful design of electrode surfaces and electrolyte conditions are required for the attainment of rapid and reversible protein-electrode interaction. The electron transfer reactions of more complex systems, such as redox enzymes, are now being examined. The 'well-behaved' electrochemistry of redox proteins can be usefully exploited by coupling the electrode reaction to enzymes for which the redox proteins act as cofactors. In systems where direct electron transfer is very slow, small electron carriers, or mediators, may be employed to enhance the rate of electron exchange with the electrode. The organometallic compound ferrocene and its derivatives have proved particularly effective in this role. A new generation of electrochemical biosensors employs ferrocene derivatives as mediators.
264 citations
144 citations
TL;DR: In this article, the inclusion compounds of ferrocene and its derivatives with α-, β-, and γ-cyclodextrins have been prepared in a crystalline state in high yields.
Abstract: Inclusion compounds of ferrocene and its derivatives with α-, β-, and γ-cyclodextrins have been prepared in a crystalline state in high yields. β-Cyclodextrin and γ-cyclodextrin formed 1 : 1 stoicheiometric inclusion compounds. α-Cyclodextrin formed 2 : 1 (host:guest) complexes with ferrocene and its monosubstituted derivatives, but did not form complexes with 1,1′-disubstituted derivatives. The complexes of α- and β-cyclodextrin with ferrocene are thermally stable and do not liberate ferrocene on heating at 100 °C in vacuo. The inclusion compounds were characterized by 1H n.m.r., i.r., u.v., and circular dichroism spectroscopy. A large positive induced Cotton effect was observed in the case of complex of β-cyclodextrin with ferrocene, while the complex of γ-cyclodextrin showed a negative spectrum. The binding mode is discussed.
85 citations
TL;DR: In this article, cyclic voltammetry in MeCN at various temperatures and pressures, including supercritical conditions, is described, and diffusion coefficients of phenanzine and ferrocene up to Tc are reported, and the determination of viscosity of high temperature/high pressure liquids and fluids based on measurements of D via the Stokes-Einstein equation is suggested.
56 citations
Patent•
21 Nov 1988
TL;DR: In this paper, the use of organometallic compounds, known as metallocenes, as redox shuttle reagents to provide overcharge protection for cells having alkali metal negative electrodes (anodes).
Abstract: The invention features the use of redox reagents, dissolved in non-aqueous electrolytes, to provide overcharge protection for cells having alkali metal negative electrodes (anodes). In particular, the invention features the use of organometallic compounds, known as metallocenes,as redox shuttle reagents to provide overcharge protection. Specific examples of this invention are bis(cyclopentadienyl)iron, known as ferrocene; bis(n-butyl-cyclopentadienyl)iron, known as butylferrocene; bis(cyclopentadienyl)nickel, known as nickelocene; and bis(cyclopentadienyl)cobalt, known as cobaltocene. An example of a rechargeable battery in which these redox reagents are used has an Li negative electrode and a TiS₂ positive electrode.
55 citations
TL;DR: In this article, the photochemical introduction of trifluoromethyl group with CF3Br in aromatic and heteroaromatic rings was investigated for 9 compounds, including Naphthalene, anthracene, anisole, N,N-dimethylaniline, ferrocene, benzo[b]thiophene, isoquinoline, and N-methylpyrrole.
Abstract: The photochemical introduction of trifluoromethyl group with CF3Br in aromatic and heteroaromatic rings was investigated for 9 compounds. Naphthalene, anthracene, anisole, N,N-dimethylaniline, ferrocene, benzo[b]thiophene, isoquinoline, and N-methylpyrrole gave trifluoromethylated products in 6.5–100% yields. In one step from uracil, a pharmacologically important 5-trifluoromethyluracil can be synthesized by this method in 11% yield. Based on the mechanistic study carried out for the naphthalene–CF3Br–CH3CN system, the reaction is found to proceed via the electron transfer from an excited singlet state of naphthalene to CF3Br.
52 citations
TL;DR: In this paper, a mixture of 2,3,4,5-tetramethylcyclopent-2-enone with vinylmagnesium bromide in THF gave a 5/1 mixture of 1,2, 3, 4, 6-pentamethylfulvene and vinyltetrammethylcyclopentadienes.
41 citations
TL;DR: The mode of attachment of the [W(CO)5] fragment in the latter compound has been determined by NMR and single crystal X-ray diffraction studies.
41 citations
41 citations
TL;DR: In this article, the organometallic ligand derived from ferrocene(H 2 L), bis(1-methyl-1-benzoylhydrazonoethyl)cyclopentadienyl has been prepared.
TL;DR: A series of bis-(4-alkoxy-4′-biphenyl)ferrocene 1,1′-diesters has been synthesized in this paper, which exhibit liquid-crystal phases.
Abstract: A series of bis-(4-alkoxy-4′-biphenyl)ferrocene 1,1′-diesters (1) has been synthesized; three compounds in this homologous series exhibit liquid-crystal phases.
TL;DR: In this paper, the interaction of various π-complexes of transition metals with proton donors in liquid Xe solutions at 165-270 K was studied by the method of IR spectroscopy.
TL;DR: An amperometric glucose-sensing electrode was constructed by immobilizing glucose oxidase and fine particles of ferrocene in a photo-crosslinked poly(vinyl alcohol) layer.
Abstract: An amperometric glucose-sensing electrode has been constructed by immobilizing glucose oxidase and fine particles of ferrocene in a photo-crosslinked poly(vinyl alcohol) layer. The magnitude of the response of the ferrocene-mediated electrode to glucose (0.5–50 mmol dm−3) increases when polypyrrole, an electrically conducting polymer, is incorporated into the poly(vinyl alcohol) support.
TL;DR: In this article, the lifetime of ferrocene in the triplet state T1, τT1 = 0.6 ns, was determined in dimethyl sulfoxide at room temperature by photisomerization of phenylosazone-D-glucose.
TL;DR: In this article, a copolymerization of pyrrole and 3-(6-ferrocenyl-6-hydroxyhexyl)pyrrole yields a ferrocene functionalized polypyroxide with a controllable amount of ferrocenes functionalization.
Abstract: Electrochemical copolymerization of pyrrole and 3-(6-ferrocenyl-6-hydroxyhexyl)pyrrole yields a ferrocene functionalized polypyrrole with a controllable amount of ferrocene functionalization.
TL;DR: In this paper, different orientations of ferrocene nuclei can be obtained in the Langmuir- Blodgett (LB) films of amphiphilic ferricene and biferrocene derivatives, depending on the number of long-chain substituents.
TL;DR: The crystal and molecular structure of 1, 1′-(1, 4, 10, 13-tetraoxa-7, 16-diazacyclo-octadecane, 7, 16diyldicarbonyl)ferrocene have been determined as discussed by the authors.
TL;DR: The crystal structure of 1,8-diruthenocenylnaphthalene has been determined in this article, showing that there is a significant decrease in electron density on cyclopentadienyl rings on oxidation of ferrocene to a ferricenium cation, consistent with theoretical analyses.
TL;DR: In this paper, the synthesis of two novel macrocyclic hydrophobic host molecules (4) and (6) containing respectively four and twelve ferrocene redox-active centres is described.
TL;DR: In this paper, the 1 H and 13 C NMR spectra of a series of (η 5 -cyclopentadienyl)dicarbonylnitrosylchromium-substituted carbonium ions have been determined.
TL;DR: Le carbanion bicyclo [3.2.2] nonatriene-3,6,8 ure-4 est obtenu a partir du cycloheptatriene and conduit par addition avec FeCl 2 au complexe du titre as discussed by the authors.
Abstract: Le carbanion bicyclo [3.2.2] nonatriene-3,6,8 ure-4 est obtenu a partir du cycloheptatriene et conduit par addition avec FeCl 2 au complexe du titre. La structure RX, l'oxydation voltammetrique et les donnees RMN 1 H et 13 C de ce complexe sont comparees a celles du ferrocene
TL;DR: Complexes of 1,1′-bis(diphenylphosphino)ferrocene corresponding to the separate steps of cross-coupling have been identified and related to the catalytic cycle as mentioned in this paper.
Abstract: Complexes of 1,1′-bis(diphenylphosphino)ferrocene corresponding to the separate steps of cross-coupling have been identified and related to the catalytic cycle.
TL;DR: In this paper, the authors reported the detection and characterization by NMR spectroscopy of a novel paramagnetic Fe(II)-benzyl compound (TMEDA)Fe(CH/sub 2/Ph)/sub 2/, which is the key intermediate in the coupling of benzyl halides by (CpFe(COD))(Li-(TMEDa))(Cp = C/sub 5/H/Sub 5//sup -/, COD = 1,5-cyclooctadiene, TMEDA = Me/sub 3/N
Abstract: Paramagnetic metal-hydrocarbyl species have been postulated as intermediates in several organometallic reaction sequences In the preponderance of these reactions the paramagnetic intermediate has been detected by ESR spectroscopy In other cases these species have been implicated by the observation of CIDNP as a result of the formation of an accompanying organic radical Unfortunately, the more direct characterization of these intermediates by NMR spectroscopy based upon chemical shifts and resonance intensities has, thus far, been hindered by sever line broadening Herein, the authors report the detection and characterization by NMR spectroscopy of a novel paramagnetic Fe(II)-benzyl compound (TMEDA)Fe(CH/sub 2/Ph)/sub 2/, which is the key intermediate in the coupling of benzyl halides by (CpFe(COD))(Li-(TMEDA)), (Cp = C/sub 5/H/sub 5//sup -/, COD = 1,5-cyclooctadiene, TMEDA = Me/sub 2/N(CH/sub 2/)/sub 2/NMe/sub 2/)
TL;DR: In this article, the molecular hyperpolarisability of ferrocene has been measured in the molten state, in solution and for a liquid derivative, and the value of the third order coefficient, γ, was found to be three times that of nitrobenzene for 10 ns duration pulses at 1.06 μm.
TL;DR: In this article, the spectral features of the film reveal a N-N-coupling with a total absence of NH stretching band, and the polymer is structurally modified compared to the film produced by carbazole oxidation in N,Ndimethylformamide.
Abstract: The electrochemical oxidation of carbazole in acetonitrile containing tetra-n-butyl ammonium perchlorate produces a green film on the electrode; this film is electrocatalytic to the oxidation of 9,10-diphenylanthracene, or perylene or 9,10-dimethylanthracene or ferrocene. The spectral features of the film reveal a N-N-coupling with a total absence of—NH stretching band. It is soluble in N,N-dimethylformamide. The polymer is structurally modified compared to the film produced by carbazole oxidation in N,N-dimethylformamide.