Citation: ZHAO Shun-Sheng, ZHANG Zhao, SHI Guo-Xiang, FENG Wei-Xu, LÜ Xing-Qiang, LIU Xiang-Rong. Heterobinuclear Zn-Eu or Zn-Tb Complexes Formed from Benzimidazole Derivatives and Metal Salts: Synthesis, Structures and Photophysical Properties[J]. Acta Physico-Chimica Sinica, ;2013, 29(07): 1408-1414. doi: 10.3866/PKU.WHXB201305081 shu

Heterobinuclear Zn-Eu or Zn-Tb Complexes Formed from Benzimidazole Derivatives and Metal Salts: Synthesis, Structures and Photophysical Properties

1.
1 College of Chemistry and Chemical Engineering, Xi’an University of Science & Technology, Xi’an 710054, P. R. China;
2 Shaanxi Key Laboratory of Physico-inorganic Chemistry, Northwest University, Xi’an 710069, Shaanxi, P. R. China

Received Date: 4 February 2013
Available Online: 8 May 2013
Fund Project: 国家自然科学基金(21103135, 21173165, 21073139) (21103135, 21173165, 21073139)陕西省自然科学基础研究计划(2011JQ2011) (2011JQ2011)陕西省教育厅自然科学专项(12JK0622) (12JK0622)西安科技大学博士启动金(2010QDJ030)资助项目 (2010QDJ030)

Four isostructural heterobinuclear Zn-Ln (Ln=Eu or Tb) complexes are prepared through the self-assembly of benzimidazole derivatives 2-(2-hydroxy-3-methoxyphenyl)benzimidazole (HL¹) or 2-(5-bromo-2-hydroxy-3-methoxyphenyl)benzimidazole (HL²) with Zn(CH₃COO)₂·2H₂O and Eu(NO₃)₃·6H₂O or Tb(NO₃)₃·6H₂O). The complexes are characterized by single-crystal X-ray diffraction, Fourier transform infrared (FTIR) spectroscopy, elementary analysis, and electrospray ionization mass spectrometry (ESIMS). Three of the complexes form single crystals, while the fourth is polycrystalline. UV-Vis absorption, excitation and emission spectra of the Tb³⁺-based complexes reveal strong, characteristic luminescence from Tb³⁺ with emissive lifetimes in the microsecond range. Therefore, Tb³⁺ has been sensitized from the excited state of the ligands because of effective intramolecular energy transfer. The Eu³⁺ complexes do not show characteristic emission because of deactivation by a different pathway.
- Benzimidazole derivative,
- Sensitization,
- Energy transfer,
- Antennae effect,
- Characteristic emission
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