34 research outputs found
Mechanical Bonds and Topological Effects in Radical Dimer Stabilization
While mechanical bonding stabilizes tetrathiafulvalene (TTF) radical dimers, the question arises: what role does topology play in catenanes containing TTF units? Here, we report how topology, together with mechanical bonding, in isomeric [3]- and doubly interlocked [2]catenanes controls the formation of TTF radical dimers within their structural frameworks, including a ring-in-ring complex (formed between an organoplatinum square and a {2+2} macrocyclic polyether containing two 1,5-dioxynaphthalene (DNP) and two TTF units) that is topologically isomeric with the doubly interlocked [2]catenane. The separate TTF units in the two {1+1} macrocycles (each containing also one DNP unit) of the isomeric [3]catenane exhibit slightly different redox properties compared with those in the {2+2} macrocycle present in the [2]catenane, while comparison with its topological isomer reveals substantially different redox behavior. Although the stabilities of the mixed-valence (TTF2)^(•+) dimers are similar in the two catenanes, the radical cationic (TTF^(•+))_2 dimer in the [2]catenane occurs only fleetingly compared with its prominent existence in the [3]catenane, while both dimers are absent altogether in the ring-in-ring complex. The electrochemical behavior of these three radically configurable isomers demonstrates that a fundamental relationship exists between topology and redox properties
Etat nutritionnel de personnes démentes et non démentes à domicile en Afrique Centrale.
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Darius Codoman , tragédie en cinq actes, en vers, par M. Devineau. Quatrième édition, revue par l'auteur
Épithalame pour le mariage de S. M. l'Empereur Napoléon avec S. A. I. l'archiduchesse Marie-Louise d'Autriche . Par M. Devineau
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Le statut nutritionnel des personnes âgées démentes et non démentes en Afrique Centrale.
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Le statut nutritionnel des personnes âgées démentes et non démentes en Afrique Centrale, EDAC Study
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Statut nutritionnel des personnes âgées démentes et non démentes en Afrique Centrale.
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Etude du statut nutritionnel des personnes âgées démentes et non démentes vivant en milieu urbain en Afrique Centrale : enquêtes épidémiologie des Démences en Afrique Centrale (EDAC)
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