苯并咪唑衍生配体锌-铕(或铽)异金属双核配合物的合成、结构与光学性质

doi:10.3866/PKU.WHXB201305081

Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (07): 1408-1414.doi: 10.3866/PKU.WHXB201305081

• THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY • Previous Articles Next Articles

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

ZHAO Shun-Sheng¹, ZHANG Zhao², SHI Guo-Xiang², FENG Wei-Xu², LÜ Xing-Qiang², LIU Xiang-Rong¹

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:2013-02-04 Revised:2013-05-08 Published:2013-06-14
Contact: ZHAO Shun-Sheng, Lü Xing-Qiang E-mail:shshzhao@xust.edu.cn;lvxq@nwu.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (21103135, 21173165, 21073139), Natural Science Basic Research Plan in Shaanxi Province of China (2011JQ2011), Scientific Research Program Funded by Shaanxi Provincial Education Commission, China (12JK0622), and Foundation of Xi'an University of Science and Technology, China (2010QDJ030)

Abstract

Abstract:

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.

Key words: Benzimidazole derivative, Sensitization, Energy transfer, Antennae effect, Characteristic emission

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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 Phys. -Chim. Sin., 2013, 29(07): 1408-1414.

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

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