Preparation, Photo-luminescence and Electro-Luminescence Behavior of Langmuir−Blodgett Films of Bipyridylrhenium(I) Surfactant Complexes

Authors

  • Vivian Wing-Wah Yam,

    1. Center for Carbon-Rich Molecular and Nano-Scale Metal-Based Materials Research, Department of Chemistry, and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, Fax: (internat.) + 852-28571586
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  • Bin Li,

    1. Center for Carbon-Rich Molecular and Nano-Scale Metal-Based Materials Research, Department of Chemistry, and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, Fax: (internat.) + 852-28571586
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  • Yu Yang,

    1. Center for Carbon-Rich Molecular and Nano-Scale Metal-Based Materials Research, Department of Chemistry, and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, Fax: (internat.) + 852-28571586
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  • Ben Wai-Kin Chu,

    1. Center for Carbon-Rich Molecular and Nano-Scale Metal-Based Materials Research, Department of Chemistry, and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, Fax: (internat.) + 852-28571586
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  • Keith Man-Chung Wong,

    1. Center for Carbon-Rich Molecular and Nano-Scale Metal-Based Materials Research, Department of Chemistry, and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, Fax: (internat.) + 852-28571586
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  • Kung-Kai Cheung

    1. Center for Carbon-Rich Molecular and Nano-Scale Metal-Based Materials Research, Department of Chemistry, and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, Fax: (internat.) + 852-28571586
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Abstract

Several bipyridylrhenium(I) surfactant complexes, fac-[Re(CO)3(bpy)(L)]PF6 [bpy = 2,2′-bipyridine, L = trans-4-dodecyloxy-4′-stilbazole (L1), trans-4-octadecyloxy-4′-stilbazole (L2), 4-(4′-dodecyloxyphenylethynyl)pyridine (L3)] were synthesized and characterised. The X-ray crystal structure of fac-[Re(CO)3(bpy)(L1)]PF6 has been determined. The complexes exhibited intense photo-luminescence which has been ascribed to the dπ(Re) ⇄ π*(bpy) metal-to-ligand charge transfer (MLCT) triplet emission. The complexes were found to form stable Langmuir−Blodgett (LB) films with relatively high collapse pressures. The organic light-emitting diodes (OLEDs) fabricated by employing the LB films of various complexes as the emitting layer exhibited electroluminescence (EL) behavior. The luminances of the EL devices were found to vary as a function of the number of LB film layers, hydrocarbon chain length and the deposition types. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)

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