ChemInform Abstract: SYNTHETIC AND NMR STUDIES ON FLUORINATED ALKOXIDES OF PLATINUM(II): AN INVESTIGATION OF THE TRANS INFLUENCE OF ALKOXIDES AND THE NATURE OF THE PLATINUM-OXYGEN BOND, USING PHOSPHINE AND THIOETHER COMPLEXES

SummaryPhysico-chemical properties of recombinant desulphatohirudin expressed in yeast (CIBA GEIGY code No. CGP 39393) were reinvestigated. As previously reported for natural hirudin, the recombinant molecule exhibited abnormal behaviour by gel filtration with an apparent molecular weight greater than that based on the primary structure. However, molecular weight estimation by SDS gel electrophoresis, FAB-mass spectrometry and Photon Correlation Spectroscopy were in agreement with the theoretical molecular weight, with little suggestion of dimer or aggregate formation. Circular dichroism studies of the recombinant molecule show similar spectra at different pH values but are markedly different from that reported by Konno et al. (13) for a natural hirudin-variant. Our CD studies indicate the presence of about 60% beta sheet and the absence of alpha helix in the secondary structure of recombinant hirudin, in agreement with the conformation determined by NMR studies (17)

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NMR studies of alkali intercalted carbon nanotubes

MRS Proceedings ◽

10.1557/proc-772-m3.4 ◽

2003 ◽

Vol 772 ◽

Cited By ~ 1

Author(s):

M. Schmid ◽

C. Goze-Bac ◽

M. Mehring ◽

S. Roth ◽

P. Bernier

Keyword(s):

Carbon Nanotubes ◽

Lattice Relaxation ◽

Spin Lattice Relaxation ◽

Energy Storage Devices ◽

Nmr Studies ◽

Storage Devices ◽

Spin Lattice ◽

Relaxation Measurements ◽

Resonance Spin ◽

Walled Carbon Nanotubes

AbstractLithium intercalted carbon nanotubes have attracted considerable interest as perspective components for energy storage devices. We performed 13C Nuclear Magnetic Resonance spin lattice relaxation measurements in a temperature range from 4 K up to 300 on alkali intercalated Single Walled Carbon Nanotubes in order to investigate the modifications of the electronic properties. The density of states at the Fermi level were determined for pristine, lithium and cesium intercalated carbon nanotubes and are discussed in terms of intercalation and charge transfer effects.

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Oxygen-Oxygen Bond Cleavage and Formation in Co(II) Mediated Stoichiometric O2 Reduction via the Potential Intermediacy of a Co(IV) Oxyl Radical

10.26434/chemrxiv.7176392 ◽

2018 ◽

Author(s):

Lucie Nurdin ◽

Denis M. Spasyuk ◽

Laura Fairburn ◽

Warren Piers ◽

Laurent Maron

Keyword(s):

Bond Cleavage ◽

Peroxo Complex ◽

Oxygen Oxygen ◽

O2 Reduction ◽

Oxygen Bond ◽

Pentadentate Ligand

Diprotonation of a remarkably stable, toluene soluble cobalt peroxo complex supported by a neutral, dianionic pentadentate ligand leads to facile O-O bond cleavage and production of a highly reactive Co(IV) oxyl cation intermediate that dimerizes and releases O2. These processes are relevant to both O2 reduction and O2 evolution and the mechanism was probed in detail both experimentally and computationally.

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