title: Photophysical properties of non-homoconjugated 1,2-dihydro, 1,2,3,4-tetrahydro and 1,2,3,4,5,6-hexahydro-C60 derivatives.
abstract: The photophysical properties of a novel series of non-homoconjugated 1,2-di-, 1,2,3,4-tetra-, and 1,2,3,4,5,6-hexasubstituted fullerenes (compounds 1, 2, and 3, respectively) have been systematically investigated. In this report, we examine the effect of substitution pattern of non-homoconjugated derivatized fullerenes on the ground state UV-Vis absorption, triplet state properties (lifetime, quantum yield, extinction coefficient), and singlet oxygen quantum yield. The non-homoconjugated fullerene derivatives 1-3 exhibit higher singlet oxygen quantum yield than analogous homoconjugated Bingel adducts with the same number of saturated C[double bond, length as m-dash]C bonds and exhibit decreasing quantum yield of singlet oxygen generation upon increasing the degree of functionalization on a single six member ring on the fullerene cage. This trend is similar for triplet quantum yield and triplet lifetime. The triplet extinction coefficient increases with functionalization. A detailed discussion comparing 1, 2, and 3 with functionalized homoconjugated systems and with other non-homoconjugated derivatives is presented.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA.
authors.forename: Khin K
authors.initials: KK
authors.lastname: Chin
authors.forename: Shih-Ching
authors.initials: SC
authors.lastname: Chuang
authors.forename: Billy
authors.initials: B
authors.lastname: Hernandez
authors.forename: Luis M
authors.initials: LM
authors.lastname: Campos
authors.forename: Matthias
authors.initials: M
authors.lastname: Selke
authors.forename: Christopher S
authors.initials: CS
authors.lastname: Foote
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Garcia-Garibay