title: Influence of bridge topology and torsion on the intramolecular electron transfer.
abstract: To study molecules able to act as good "molecular wires", intramolecular electron transfer between two triphenylmethyl redox centers connected by bridges with different topologies and substituents have been studied in solution, both by UV-Vis-NIR and EPR spectroscopies. The synthetic methodology used allows a complete control of the geometry of polychlorotriphenylmethyl diradicals 1 and 2, which have para and meta topologies, respectively, as well as of their E/Z isomerism. This fact is used to show the influence of the different topologies in the ease of electron transfer, which is larger for the para than for the meta isomer where a small or negligible electronic coupling is observed. The related diradical 3 that have the same topology as the para isomer 1 but bearing two substituents on the central phenyl ring shows similar ease of electron transfer, that the para isomer 1.
authors.affiliation: Institut de Ciència de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, 08193 Cerdanyola, Spain.
authors.forename: Vega
authors.initials: V
authors.lastname: Lloveras
authors.forename: José
authors.initials: J
authors.lastname: Vidal-Gancedo
authors.forename: Daniel
authors.initials: D
authors.lastname: Ruiz-Molina
authors.forename: Teresa M
authors.initials: TM
authors.lastname: Figueira-Duarte
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Nierengarten
authors.forename: Jaume
authors.initials: J
authors.lastname: Veciana
authors.forename: Concepció
authors.initials: C
authors.lastname: Rovira