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Université de Neuchâtel

Switchable Mesomorphic Materials Based on the Ferrocene−Ferrocenium Redox System: Electron-Transfer-Generated Columnar Liquid-Crystalline Phases

Deschenaux, Robert ; Vilches, Maria-Teresa ; Schweissguth, Martin ; Levelut, Anne-Marie ; Long, Gary J. ; Hautot, Dimitri ; Luneau, Dominique

In: Organometallics, 1999, vol. 18, no. 26, p. 5553–5559

Oxidation of the non-mesomorphic ferrocene derivative 1 with silver toluene-4-sulfonate gave the ferrocenium derivative 2, which showed a monotropic columnar phase. The latter two-dimensional phase is composed of ribbons, in which derivative 2 is organized into bilayers, and has a centered rectangular symmetry with a = 318.3 Å and c = 94.9 Å. The Mössbauer...

Université de Neuchâtel

A Ferrocene-Containing Carbohydrate Surfactant: Thermotropic and Lyotropic Phase Behavior

Donnio, Bertrand ; Seddon, John M. ; Deschenaux, Robert

In: Organometallics, 2000, vol. 19, no. 16, p. 3077–3081

A ferrocene-containing carbohydrate surfactant has been synthesized and shown by polarized optical microscopy, differential scanning calorimetry, and X-ray diffraction to exhibit both thermotropic and lyotropic liquid-crystalline phase behavior. This new class of materials should prove useful for the design of redox-active lyotropic liquid crystals, allowing fine electrochemical control of the...

Université de Neuchâtel

Highly Efficient NMR Enantiodiscrimination of Chiral Octanuclear Metalla-Boxes in Polar Solvent

Barry, Nicolas P.E. ; Austeri, Martina ; Lacour, Jerôme ; Therrien, Bruno

In: Organometallics, 2009, vol. 28, no. 16, p. 4894–4897

Detection of the molecular chirality of a series of octanuclear metalla-boxes can be readily achieved using the NMR chiral solvating agent Λ-BINPHAT in CD3CN: only 0.05 to 0.10 equiv being necessary for a complete baseline separation of some of the proton signals.

Université de Neuchâtel

Adsorption of Phenolic Compounds from Aqueous Solutions, by Activated Carbons, Described by the Dubinin−Astakhov Equation

Stoeckli, Fritz ; López-Ramón, María Victoria ; Moreno-Castilla, Carlos

In: Langmuir, 2001, vol. 17, no. 11, p. 3301–3306

It is shown that the adsorption of phenol and 3-chlorophenol from aqueous solutions, by basic active carbons and at an equilibrium solution pH below that of dissociation of the phenols, can be described by an equation of the DRK type with exponent n = 4. The principle of temperature invariance is fulfilled between 283 and 313 K, which means that predictions can be made on the basis of a...