title: Linear and nonlinear optical properties of triphenylamine-functionalized C60: insights from theory and experiment.
abstract: In the present study we report on the linear and nonlinear optical properties of C(60)-triphenylamine (TPhA) hybrids. The synthesized materials were prepared following the 1,3-dipolar cycloaddition of azomethine ylides onto the skeleton of C(60) forming the TPhA-based monoadduct, equatorial bis-adduct and dumbell C(60). Complementary spectroscopic techniques, such as NMR, MALDI-TOF-MS, and ATR-IR are applied for the structural characterization of the hybrid materials, while intermolecular electronic interactions are investigated by UV-Vis measurements. In all considered cases, C(60) serves as an acceptor while the triphenylamine unit is chosen as a donor. In order to investigate the dependence of the second-order hyperpolarizability on the architecture of the systems (D-A, A-D-A) we use a Z-scan technique employing 532 nm, 35 ps laser pulses. We have found that the total second-order hyperpolarizability of the C(60)-TphA-C(60) system is several times larger than that of TPhA-C(60). The results of experimental measurements are supported by quantum-chemical calculations.
authors.affiliation: Theoretical Chemistry Group, Institute of Physical and Theoretical Chemistry, Wrocław University of Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland. robert.zalesny@pwr.wroc.pl
authors.forename: Robert
authors.initials: R
authors.lastname: Zaleśny
authors.forename: Oleksandr
authors.initials: O
authors.lastname: Loboda
authors.forename: K
authors.initials: K
authors.lastname: Iliopoulos
authors.forename: G
authors.initials: G
authors.lastname: Chatzikyriakos
authors.forename: Stelios
authors.initials: S
authors.lastname: Couris
authors.forename: Georgios
authors.initials: G
authors.lastname: Rotas
authors.forename: Nikos
authors.initials: N
authors.lastname: Tagmatarchis
authors.forename: Aggelos
authors.initials: A
authors.lastname: Avramopoulos
authors.forename: Manthos G
authors.initials: MG
authors.lastname: Papadopoulos