Langmuir-Blodgett Films of Dinuclear Mercury(ii)-Containing Diethynylcarbazole/Polyoxometalate Hybrids: Film Characterization Studies and Potential Optoelectronic Applications

Li Liu; Ming Chen; Ling-Xiang Qiao; Shi-Zhong Liu; Zu-Liang Du; Wai-Yeung Wong

doi:10.1071/CH10018

RESEARCH ARTICLE

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Langmuir-Blodgett Films of Dinuclear Mercury(ii)-Containing Diethynylcarbazole/Polyoxometalate Hybrids: Film Characterization Studies and Potential Optoelectronic Applications

Li Liu ^A ^D , Ming Chen ^A , Ling-Xiang Qiao ^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(9) 1376-1381 https://doi.org/10.1071/CH10018
Submitted: 12 January 2010 Accepted: 29 March 2010 Published: 9 September 2010

Abstract

A new family of organometallic/inorganic hybrid Langmuir-Blodgett (LB) films, consisting of organometallic mercury acetylide (OMA) as the π-conjugated organometallic molecule and polyoxometallate (POM, POM = K₅BW₁₂O₄₀ or Na₅IMo₆O₂₄) of the Keggin and Anderson structures as the inorganic composite and docosanoic acid (DA) as the auxiliary film-forming agent, were prepared and well characterized by π–A isotherms, UV-vis absorption and photoluminescence spectra, atomic force microscopy imaging, scanning tunnelling microscopy, and low-angle X-ray diffraction. Our experimental results indicate that stable and well defined monolayer Langmuir and LB films are formed in pure water and POM subphases. There is a quenching effect in the luminescence intensity of the mercury complex when it is made into the LB films due to the enhanced aggregation phenomenon. These alkynylmercury(ii) based LB films exhibit interesting electrical conductivity behaviour, dependent of the characteristics of the POM used. They all reveal decent electrical conductivity, and the tunnelling current can reach ±100 nA when the voltage is set at –5 to +5 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 (HKBU202607) and the Hong Kong Baptist University (FRG/07–08/II-65) for financial support.

References

Langmuir-Blodgett Films of Dinuclear Mercury(ii)-Containing Diethynylcarbazole/Polyoxometalate Hybrids: Film Characterization Studies and Potential Optoelectronic Applications

Abstract

Acknowledgements

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