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Citation: DENG Ji-Yong, LIU Yu, HU Zheng-Yong, ZHU Mei-Xiang, ZHU Wei-Guo. Structure and Properties of Oxadiazole Derivatives as a New Class of Cyclometalating Ligands[J]. Chinese Journal of Applied Chemistry, ;2007, 24(10): 1119-1123. shu

Structure and Properties of Oxadiazole Derivatives as a New Class of Cyclometalating Ligands

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a College of Chemistry, Xiangtan University, Xiangtan 411104;
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b Department of Chemistry and Chemical Engineering, Hunan lnsititute of Engineering, Xiangtan

Corresponding author: ZHU Wei-Guo,
Received Date: 16 January 2007
Available Online: 18 March 2007
Fund Project: 国家自然科学基金项目(20272014,50473046) (20272014,50473046)湖南省杰出青年基金项目(04JJ1002) (04JJ1002)湖南省自然科学基金项目(06JJ2008)资助 (06JJ2008)

Five 2,5-diaryl-1,3,4-oxadiazole derivatives used as a new class of cyclometlating ligands were synthsized. Their molecular structures were characterized by IR, ¹H NMR and element analysis. Furthermore, their spectroscopic, thermal and electrochemical properties were investigated by UV spectroscopy, fluorescence spectroscopy, differential scanning calorimetry(DSC) and cyclic voltammetry(CV), respectively. The results showed that the maximum UV absorption wavelengths of those 1,3,4-oxadiazole derivatives in dichloromethane were in the range of 268~327 nm, and their maximum photoluminescent wavelengths in dichloromethane and solid film were located at 332~390 nm and 359~439 nm, respectively. The 1,3,4-oxadiazole derivatives exhibit a first endothermal peak at 120~328℃ in the DSC heating process, and the symmetrical 1,3,4-oxadiazole derivatives display a higher melting temperature. The CV curves of those 1,3,4-oxadiazole derivatives indicate that the reductive potentials of the 1,3,4-oxadiazole derivatives are located at -1.03~-0.98 V, and their LUMO(the lowest unoccoupied molecual orbit) energy levels are -3.71~-3.76 eV.
- cyclomedtalating ligand,
- oxadiazole derivate,
- chemical structure,
- property
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