Synthesis, Characterization, and Acid–Base Properties of Ruthenium(ii) Complexes Containing N-ethyl-4-([1,10]-phenanthroline[5,6–f]imidazol-2-yl)carbazole

Li Xu; Peng-Xin Liu; Guo-Liang Liao; Xiang Chen; Hui Chao; Liang-Nian Ji

doi:10.1071/CH09565

RESEARCH ARTICLE

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Synthesis, Characterization, and Acid–Base Properties of Ruthenium(ii) Complexes Containing N-ethyl-4-([1,10]-phenanthroline[5,6–f]imidazol-2-yl)carbazole

Li Xu ^A , Peng-Xin Liu ^A , Guo-Liang Liao ^A , Xiang Chen ^A , Hui Chao ^A ^B and Liang-Nian Ji ^A ^B

+ Author Affiliations

- Author Affiliations

^A MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, MOE Laboratory of Gene Engineering, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China.

^B Corresponding authors. Email: ceschh@mail.sysu.edu.cn; cesjln@mail.sysu.edu.cn

Australian Journal of Chemistry 63(4) 700-708 https://doi.org/10.1071/CH09565
Submitted: 21 October 2009 Accepted: 26 January 2010 Published: 8 April 2010

Abstract

Three new ruthenium(ii) polypyridyl complexes, [Ru(phen)₂(Hecip)]²⁺ (1), [Ru(phen)(Hecip)₂]²⁺ (2), and [Ru(Hecip)₃]²⁺ (3) complexes (phen = 1,10-phenanthroline, Hecip = N-ethyl-4-([1,10]-phenanthroline[5,6–f]imidazol-2-yl)carbazole) were synthesized and characterized by ES-MS, ¹H NMR spectroscopy, elemental analysis, and cyclic voltammetry. The emission spectra of complexes were measured both at room temperature and at 77 K in a 4/1 (v/v) EtOH/MeOH matrix. All three complexes display luminescence properties which are close to that featured by the parent [Ru(phen)₃]²⁺ species. The pH effects on the UV-vis and emission spectra of Ru^II complexes were also studied, and complexes 1, 2, and 3 were found to act as ‘on–off’ luminescent pH switches with maximum on–off ratios of 17, 230, and 90, respectively.

Acknowledgements

This work was supported by 973 Program of China (2007CB815306), NSFC (20771105, 20871122), NCET (NCET-06-0718), and the Key Project (108103) of the Ministry of Education and GDNSFC (9351027501000003).

References

Synthesis, Characterization, and Acid–Base Properties of Ruthenium(ii) Complexes Containing N-ethyl-4-([1,10]-phenanthroline[5,6–f]imidazol-2-yl)carbazole

Abstract

Acknowledgements

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