Acta Chimica Sinica ›› 2007, Vol. 65 ›› Issue (7): 607-614. Previous Articles     Next Articles

Original Articles


闫振忠1, 唐瑜*,1, 谭民裕1, 刘伟生1, 王大奇2   

  1. (1功能有机分子化学国家重点实验室 兰州大学化学化工学院 兰州 730000)
    (2聊城大学化学系 聊城 252059)
  • 收稿日期:2006-09-08 修回日期:2006-10-30 出版日期:2007-04-14 发布日期:2007-04-14
  • 通讯作者: 唐瑜

Synthesis, Crystal Structure and Luminescent Properties of Rare Earth Picrates Complexes with 2,6-Bis(benzimidazol-2-yl)pyridine

YAN Zhen-Zhong1; TANG Yu*,1; TAN Min-Yu1; LIU Wei-Sheng1; WANG Da-Qi2   

  1. (1 State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000)
    (2 Department of Chemistry, Liaocheng University, Liaocheng 252059)
  • Received:2006-09-08 Revised:2006-10-30 Online:2007-04-14 Published:2007-04-14
  • Contact: TANG Yu

Solid complexes of rare earth picrates (pic) with the ligand 2,6-bis(benzimidazol-2-yl)pyridine (L) have been synthesized and characterized by elemental analysis, IR and electronic spectra. The crystal and molecular structures of the complex [CeL2(pic)2](pic)•(CH3OH)3 have been determined by single crystal X-ray diffraction. The crystal structure indicates that the complex crystallizes in the triclinic space group P1 with parameters: a=1.3795(3) nm, b=2.1292(5) nm, c=2.5651(6) nm, α=105.847(3)°, β=100.150(3)°, γ=107.893(3)°, Z=2, R=0.0519, wR=0.1255. The crystal consists of two similar but independent molecules in the asymmetric unit and the Ce(III) ion coordinated toward ten donor atoms, six of which belong to the nitrogen atoms of two tridentate ligands and four oxygen atoms from two bidentate picrates. The coordination polyhedron around Ce3+ is a distorted square antiprism, and the two independent molecules are connected by π-π stacking interactions to form a noncentrosymmetric dimer. The crystal structure is built of a packing of these dimers via intermolecular hydrogen bonding to yield an infinite three-dimensional supramolecular network. At room temperature, under UV light excitation the Eu(III) complex exhibited characteristic emission of the central metal ions both in solid state and in solutions.

Key words: 2,6-bis(benzimidazol-2-yl)pyridine, rare earth picrates complex, synthesis, crystal structure, luminescent property