Roger Yebeutchou

Roger Yebeutchou
Università di Parma | UNIPR · Department of Chemistry

Phd - MATERIAL SCIENCES

About

12
Publications
580
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334
Citations
Additional affiliations
January 2007 - March 2009
Università di Parma
Position
  • PostDoc Position

Publications

Publications (12)
Article
The possibility to enhance the selectivity of phosphonate cavitands toward short-chains alcohols, namely methanol and ethanol, reducing the size of the cavity with the introduction of bulky thio-phosphonate bridging units at the upper rim is here presented. Three new mixed bridged thio-phosphonate cavitands 3POiii1PSi[H, CH3, Ph], AB-2POii2PSii[H,...
Article
Turning molecular recognition into an effective mechanical response is critical for many applications ranging from molecular motors and responsive materials to sensors. Herein, we demonstrate how the energy of the molecular recognition between a supramolecular host and small alkylammonium salts can be harnessed to perform a nanomechanical task in a...
Patent
The present invention relates to a method for in situ repairing (relining) of pipes or conduits which uses a latent epoxy system comprising a dispersion of a crosslinkable resin, a carbamate salt of an amine and possibly an amine compound. The system is applied to a substrate, for example a sheath made of a polymer material, which is positioned in...
Article
The outstanding complexing properties of tetraphosphonate cavitands towards N-methylpyridinium salts were exploited to realise a new class of linear and cyclic AABB supramolecular polymers through host-guest interactions. The effectiveness of the selected self-association processes was tested by (1)H NMR studies, whereas microcalorimetric analyses...
Article
This Communication reports the highly selective monomethylation of primary amines through host-guest product sequestration. Complete control of the outcome of the N-methylation reaction has been achieved by adding to the reaction medium stoichiometric amounts of a teraphosphonate phosphonate cavitand Tiiii, capable of selectively and quantitatively...
Article
The phosphorus-bridged cavitand 1 self-assembles very efficiently in CH2Cl2 with either the monopyridinium guest 2+ or the bispyridinium guest 3(2+). In the first case a 1:1 complex is obtained, whereas in the second case both 1:1 and 2:1 host-guest complexes are observed. The association between 1 and either one of the guests causes the quenching...
Article
Supramolekulare Plastizität: Die bemerkenswerte Wirt-Gast-Chemie von Phosphonatcavitanden wurde zum Aufbau selbstorganisierter supramolekularer Polymere genutzt (siehe Bild), die reversibel auf die Bindung von Gastspezies hin entstehen und je nach Templat von der linearen in eine sternförmig verzweigte Form wechseln. Ein Thiophosphonatcavitand mit...
Article
Full-text available
We report here the monitoring of reversible guest inclusion in phosphonate cavitands through a large increase in luminescence intensity caused by the modulation of the exoergonicity of an electron-transfer reaction.
Article
A practical and efficient protocol has been developed to realize the catalytic rearrangement of allyl but-3-enoate to heptadienoic acids in NaHCO3 saturated water, in the presence of catalytic amounts of a rhodium(I) complex, containing olefin, diene or phosphine ligands. The reaction mainly affords the sodium salt of E-2,6-heptadienoic acid, with...
Article
Abstract Supramolecular polymers are the main topic of this thesis. Such polymers are based on well defined architectures in which the building blocks are held together by non-covalent interactions. Such interactions result to be reversible and tunable. Consequently supramolecular polymers may have many advantages over traditional polymers because...

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Projects

Projects (5)
Project
The outstanding complexing properties of tetraphosphonate cavitands towards N-methylpyridinium salts were exploited to realise a new class of linear and cyclic AABB supramolecular polymers through host-guest interactions. The effectiveness of the selected self-association processes was tested by (1)H NMR studies, whereas microcalorimetric analyses clarified the binding thermodynamics and revealed the possibility of tuning entropic contributions by acting on the flexibility of the guest linker. Although the formation of linear polymeric chains for a rigid system was demonstrated by X-ray analysis, the presence of a concentration-dependent ring-chain equilibrium was indicated by solution viscosity measurements in the case of a very flexible ditopic BB guest co-monomer.
Project
Host Guest supramolecular polymers base on phosphonate cavitands