title: Pyrene-fullerene C60 dyads as light-harvesting antennas.
abstract: A series of pyrene-fullerene C60 dyads bearing pyrene units (PyFC12, PyFPy, Py2FC12 and PyFN) were synthesized and characterized. Their optical properties were studied by absorption and fluorescence spectroscopies. Dyads were designed in this way because the pyrene moeities act as light-harvesting molecules and are able to produce "monomer" (PyFC12) or excimer emission (PyFPy, Py2FC12 and PyFN). The fluorescence spectra of the dyads exhibited a significant decrease in the amount of pyrene monomer and excimer emission, without the appearance of a new emission band due to fullerene C60. The pyrene fluorescence quenching was found to be almost quantitative, ranging between 96%-99% depending on the construct, which is an indication that energy transfer occurred from one of the excited pyrene species to the fullerene C60.
authors.affiliation: Facultad de Ciencia Químicas, Universidad Autónoma de Chihuahua, Campus Universitario #2, Apartado Postal 669, Chihuahua 31125, Mexico. gzaragoza@uach.mx.
authors.forename: Gerardo
authors.initials: G
authors.lastname: Zaragoza-Galán
authors.affiliation: Facultad de Ciencia Químicas, Universidad Autónoma de Chihuahua, Campus Universitario #2, Apartado Postal 669, Chihuahua 31125, Mexico. jesus2ortiz@yahoo.com.mx.
authors.forename: Jesús
authors.initials: J
authors.lastname: Ortíz-Palacios
authors.affiliation: Facultad de Ciencia Químicas, Universidad Autónoma de Chihuahua, Campus Universitario #2, Apartado Postal 669, Chihuahua 31125, Mexico. biancaxvg@msn.com.
authors.forename: Bianca X
authors.initials: BX
authors.lastname: Valderrama
authors.affiliation: Facultad de Ciencia Químicas, Universidad Autónoma de Chihuahua, Campus Universitario #2, Apartado Postal 669, Chihuahua 31125, Mexico. acamach@uach.mx.
authors.forename: Alejandro A
authors.initials: AA
authors.lastname: Camacho-Dávila
authors.affiliation: Facultad de Ciencia Químicas, Universidad Autónoma de Chihuahua, Campus Universitario #2, Apartado Postal 669, Chihuahua 31125, Mexico. dchavez@uach.mx.
authors.forename: David
authors.initials: D
authors.lastname: Chávez-Flores
authors.affiliation: Facultad de Ciencia Químicas, Universidad Autónoma de Chihuahua, Campus Universitario #2, Apartado Postal 669, Chihuahua 31125, Mexico. vramos@uach.mx.
authors.forename: Víctor H
authors.initials: VH
authors.lastname: Ramos-Sánchez
authors.affiliation: Facultad de Ciencia Químicas, Universidad Autónoma de Chihuahua, Campus Universitario #2, Apartado Postal 669, Chihuahua 31125, Mexico. riverage@unam.mx.
authors.forename: Ernesto
authors.initials: E
authors.lastname: Rivera
mesh_terms: D000042:Absorption; D060326:Chemistry Techniques, Synthetic; D037741:Fullerenes / Q000737:chemistry*; D008027:Light; D011721:Pyrenes / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D037741:Fullerenes; D011721:Pyrenes; C030984:pyrene; C069837:fullerene C60