title: Electron-donating behavior of few-layer graphene in covalent ensembles with electron-accepting phthalocyanines.
abstract: We describe herein the first example of highly exfoliated graphene covalently linked to electron accepting phthalocyanines. The functionalization of the nanocarbon surface with alkylsulfonyl phthalocyanines was attained by means of a "click" chemistry protocol. The new ensemble was fully characterized (thermogravimetric analysis, atomic force microscopy, transmission electron microscopy and Raman, as well as ground-state absorption) and was studied in terms of electron donor-acceptor interactions in the ground and in the excited state. In particular, a series of steady-state and time-resolved spectroscopy experiments demonstrated photoinduced electron transfer from the graphene to the electron-accepting phthalocyanines. This is the first example of an electron donor-acceptor nanoconjugate, that is, few-layer graphene/phthalocyanine, pinpointing the uncommon electron donating character of graphene.
authors.affiliation: Departamento de Química Orgánica, Universidad Autónoma de Madrid, Cantoblanco , Madrid 28049, Spain.
authors.forename: Maria-Eleni
authors.initials: ME
authors.lastname: Ragoussi
authors.forename: Georgios
authors.initials: G
authors.lastname: Katsukis
authors.forename: Alexandra
authors.initials: A
authors.lastname: Roth
authors.forename: Jenny
authors.initials: J
authors.lastname: Malig
authors.forename: Gema
authors.initials: G
authors.lastname: de la Torre
authors.forename: Dirk M
authors.initials: DM
authors.lastname: Guldi
authors.forename: Tomás
authors.initials: T
authors.lastname: Torres