Regensburg 2004 – scientific programme

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 5: Poster

SYOH 5.6: Poster

Thursday, March 11, 2004, 18:00–21:00, B

Langmuir-Blodgett monolayer behavior of dinuclear ruthenium(II)trisbipyridine complexes — •Xiaodong Chen¹, Frank Vergeer², Steve Welter², Luisa de Cola², Lifeng Chi¹, and Harald Fuchs¹ — ¹Physikalisches Institut, Wilhelm-Klemm-Str. 10, 48149, Muenster, Germany — ²Molecular Photonics Group, Institute of Molecular Chemistry, University of Amsterdam, 1018 WV Amsterdam, The Netherlands

Dinuclear ruthenium complexes have been generating interest as a class of electroluminescent materials [1]. Langmuir-Blodgett (LB) technique is a powerful tool for assembling different molecules to build ultrathin organic films with well-controlled structure and thickness. In the present report, we used the LB technique to prepare dinuclear ruthenium(II)trisbipyridine complexes monolayers. The complexes contain two Ru(bpy)₃²⁺ moieties and four phenylene units as spacers between the two ruthenium centers. From the surface pressure-molecular area isotherms and morphologies, it was found that the complexes possessing long alkyl chains on one of the Ru(bpy)₃²⁺ centers and those without long alkyl chains show different behaviors. It seems that the introduction of the alkyl chains in the complexes is indeed necessary to obtain a more homogeneous film. In addition, the effect of pressure on the morphologies of monolayers was considered. The results provide basic clues for future monomolecular layers electroluminescent device preparation.

[1] S. Welter et al. Nature 421, 54 (2003)