Berlin 2008 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 2: Electric, electromechanical and optical properties I

DF 2.2: Vortrag

Montag, 25. Februar 2008, 10:40–11:00, EB 107

Molecular hybrids for optical switching — •Andrea Schuy, Theo Woike, and Dominik Schaniel — 1. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln

(CN₃H₆)₂Fe(CN)₅NO (guanidinium nitroprusside = GuNP) has the ability to form metastable isomers with a change of refractive index after irradiation with laser light in the blue-green spectral range. One isomer is formed by a rotation of the NO ligand around 180^∘ to turn the Fe-NO into a Fe-ON coordination. By subsequent irradiation with light in the near infrared spectral range the 180^∘-ligand rotates around 90^∘ to a side-on position [1]. This ability remains unaffected after embedding (CN₃H₆)₂Fe(CN)₅NO into a silica-gel matrix, even down to dilution to single-molecules. We investigated differences between the behavior of the crystalline GuNP and GuNP embedded in gel due to the effects of complex-complex interactions and complex-matrix interactions respectively on the NO-vibration.

[1] D. Schaniel, M. Imlau, Th. Weisemoeller, Th. Woike, K. Krämer, H. U. Güdel; Photoinduced nitrosyl linkage isomers uncover a variety of unconventional photorefractive media; Adv. Mat. 19 (5), 723-726 (2007).