Organometallic Gold(i) Acetylide/Polyoxometalate Hybrid Langmuir-Blodgett Films: Preparation, Characterization, and Photoelectric Properties

Li Liu; Qian Liu; Ming Chen; Ming-Jian Li; Li-Ping Xu; Shi-Zhong Liu; Zu-Liang Du; Wai-Yeung Wong

doi:10.1071/CH09198

RESEARCH ARTICLE

Organometallic Gold(i) Acetylide/Polyoxometalate Hybrid Langmuir-Blodgett Films: Preparation, Characterization, and Photoelectric Properties

Li Liu ^A ^D , Qian Liu ^A , Ming Chen ^A , Ming-Jian Li ^A , Li-Ping Xu ^A , Shi-Zhong Liu ^A , Zu-Liang Du ^B and Wai-Yeung Wong ^C ^D

+ Author Affiliations

- Author Affiliations

^A Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, School of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062, China.

^B Key Laboratory of Special Functional Materials, Henan University, Kaifeng, 475001, China.

^C Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, China.

^D Corresponding authors. Email: liulihubei@gmail.com; rwywong@hkbu.edu.hk

Australian Journal of Chemistry 63(1) 103-108 https://doi.org/10.1071/CH09198
Submitted: 7 April 2009 Accepted: 10 July 2009 Published: 8 January 2010

Abstract

A new series of organometallic/inorganic hybrid Langmuir-Blodgett (LB) films containing an organometallic gold(i) aryleneethynylene metal complex (OMA) as the π-conjugated organometallic molecule and a polyoxometalate (POM, POM = H₃BW₁₂O₄₀, H₆As₂W₁₈O₆₂, or H₆P₂Mo₁₈O₆₂) of the Keggin and Dawson structure as the inorganic composite, were prepared and characterized by π–A isotherms, UV-vis absorption spectra, photoluminescence spectra, atomic force microscopy imaging, scanning tunnelling microscopy, and surface photovoltage spectroscopy. Our experimental results indicate that stable, well defined and well organized Langmuir and LB films are formed in pure water and polyoxometalate subphases. There is a quenching effect in the luminescence of the gold(i) complex when it is made into the LB films. The OMA/POM hybrid LB films display strong photovoltage effect in the UV-vis region. The photovoltage response of OMA/H₆As₂W₁₈O₆₂ can be as high as 3338 μV. OMA/POM monolayer films show good electrical conductivity, and the tunnelling current for a OMA/H₃BW₁₂O₄₀ monolayer film amounts to 50 to approximately –100 nA when the voltage is set at ±9 V.

Acknowledgements

The authors acknowledge the financial support from the National Natural Science Foundation of China (20671033) and the Excellent Mid-youth Creative Team Project of Hubei Province Education Office (T200701). W.-Y.W. thanks the Hong Kong Research Grants Council (HKBU202508) and the Hong Kong Baptist University (FRG/07-08/II-65) for financial support.

References

Organometallic Gold(i) Acetylide/Polyoxometalate Hybrid Langmuir-Blodgett Films: Preparation, Characterization, and Photoelectric Properties

Abstract

Acknowledgements

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