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RESEARCH ARTICLE

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Synthesis, Characterization, and Photophysics of a New Trinuclear Mercury(ii) Complex of 1,3,5-Triethynylbenzene

Li Liu ^A ^B , Wai-Yeung Wong ^B ^C and Cheuk-Lam Ho ^B

+ Author Affiliations

- Author Affiliations

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

^B Department of Chemistry and Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Hong Kong, China.

^C Corresponding author. Email: rwywong@hkbu.edu.hk

Australian Journal of Chemistry 59(7) 434-438 https://doi.org/10.1071/CH06177
Submitted: 26 May 2006 Accepted: 19 June 2006 Published: 22 August 2006

Abstract

A new trinuclear mercury(ii) complex of 1,3,5-triethynylbenzene [(MeHgC≡C)₃(1,3,5-C₆H₃)] 1 was prepared in good yield by Hagihara’s dehydrohalogenation reaction of HgMeCl with [(HC≡C)₃(1,3,5-C₆H₃)] under ambient conditions. This trimercury triacetylide complex’s structure was confirmed by common spectroscopic techniques and its photophysical properties were examined and compared with the isolobal gold(i) congener [{(PPh₃)AuC≡C}₃(1,3,5-C₆H₃)] 2. Our investigations indicate that the organic triplet emissions can be harvested by the heavy-atom effect of mercury which enables efficient intersystem crossing from the S₁ singlet excited state to the T₁ triplet excited state. The influence of Hg and Au centres on the phosphorescence efficiency and evolution of the lowest electronic singlet and triplet excited states is critically characterized. Both complexes 1 and 2 possess high-energy triplet states of 2.77–2.82 eV, in which the order of intersystem crossing rate follows the order Au > Hg.

Acknowledgements

Financial support from a CERG Grant from the Hong Kong Research Grants Council of the Hong Kong SAR, China (Project No. HKBU2048/01P) is gratefully acknowledged.

References

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