title: Intra- and intermolecular charge transfer in aggregates of tetrathiafulvalene-triphenylmethyl radical derivatives in solution.
abstract: An extensive investigation of aggregation phenomena occurring in solution for a family of electron donor-acceptor derivatives, based on polychlorotriphenylmethyl radicals (PTM) linked via a vinylene-bridge to tetrathiafulvalene (TTF) units, is presented. A large set of temperature and/or concentration dependent optical absorption and electron spin resonance (ESR) spectra in a solution of dyads bearing different number of electrons and/or with a hydrogenated PTM residue offer reliable information on the formation of homo dimers and mixed valence dimers. The results shed light on the reciprocal influence of intramolecular electron transfer (IET) within a dyad and the intermolecular charge transfer (CT) occurring in a dimer between the TTF residues and are rationalized based on a theoretical model that describes both interactions.
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès (Barcelona), Spain.
authors.forename: Judith
authors.initials: J
authors.lastname: Guasch
authors.forename: Luca
authors.initials: L
authors.lastname: Grisanti
authors.forename: Manuel
authors.initials: M
authors.lastname: Souto
authors.forename: Vega
authors.initials: V
authors.lastname: Lloveras
authors.forename: José
authors.initials: J
authors.lastname: Vidal-Gancedo
authors.forename: Imma
authors.initials: I
authors.lastname: Ratera
authors.forename: Anna
authors.initials: A
authors.lastname: Painelli
authors.forename: Concepció
authors.initials: C
authors.lastname: Rovira
authors.forename: Jaume
authors.initials: J
authors.lastname: Veciana
mesh_terms: D005609:Free Radicals / Q000737:chemistry; D006571:Heterocyclic Compounds / Q000737:chemistry*; D015394:Molecular Structure; D012996:Solutions; D014320:Triphenylmethyl Compounds / Q000737:chemistry*
chemical_list: D005609:Free Radicals; D006571:Heterocyclic Compounds; D012996:Solutions; D014320:Triphenylmethyl Compounds; C063887:tetrathiafulvalene