Berlin 2005 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 2: Elektrische und optische Schichteigenschaften

DS 2.2: Vortrag

Freitag, 4. März 2005, 11:00–11:15, TU HS107

Photochromism in thin films of nitrospirobenzans — •Michael Karcher und Paul Fumagalli — Freie Universität Berlin

The photochromism of 1’,3’,3’-trimethyl-6-nitrospiro[2H-benzopyran -2,2’-indoline] (NO₂BIPS) in solution has been extensively studied.[1-4] Now we have succeeded to create thin films (about 80 nm thick) of NO₂BIPS by evaporation of powder from a stainless steel crucible at 160^∘C in high vacuum at a base pressure of 2·10⁻⁷ mbar. We observed photoswitching behaviour on irradiation of ultraviolet light in these films and compared it to the behaviour in solution using UV-VIS-spectroscopy.

[1] J. B. Flannery, Jr., J. Amer. Chem. Soc. 1968, 90, 5660-5671

[2] T. Bercovici, T. Heiligman-Rim, E. Fischer, Mol. Photochem. 1969, 1, 23

[3] A. K. Chibisov, H. Görner, J. Phys. Chem. A 1997, 101, 4305-4312

[4] H. Görner, Phys. Chem. Chem. Phys. 2001, 3, 416-423