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RESEARCH ARTICLE
Contents Vol 59(7)

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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