含混合有机共轭配体的铜（II）配合物产生高效蓝色发射

An Efficient Cyan Emission from Copper (II) Complexes with Mixed Organic Conjugate Ligands.

作者信息

Wang Jingjing, Ren Junjie, Tang Qinglin, Wang Xinzhi, Wang Yao, Wang Yanxin, Du Zhonglin, Wang Wei, Huang Linjun, Belfiore Laurence A, Tang Jianguo

机构信息

Institute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.

Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, CO 80523, USA.

出版信息

Materials (Basel). 2022 Feb 25;15(5):1719. doi: 10.3390/ma15051719.

Copper (II) complexes containing mixed ligands were synthesized in dimethyl formamide (DMF). The intense cyan emission at an ambient temperature is observed for solid copper (II) complexes with salicylic acid and a 12% quantum yield with a fluorescent lifetime of approximately 10 ms. Hence, copper (II) complexes with salicylic acid are excellent candidates for photoactive materials. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) reveal that the divalent copper metal centers coordinate with the nitrogen and oxygen lone pairs of conjugate ligands. XPS binding energy trends for core electrons in lower-lying orbitals are similar for all three copper (II) complexes: nitrogen 1s and oxygen 1s binding energies increase relative to those for undiluted ligands, and copper 2p3/2 binding energies decrease relative to that for CuCl2. The thermal behavior of these copper complexes reveals that the thermal stability is characterized by the following pattern: Cu(1,10-phenanthroline)(salicylic acid) > Cu(1,10-phenanthroline)(2,2’-bipyridine) > Cu(1,10-phenanthroline)(1-benzylimidazole)2.

含混合配体的铜（II）配合物在二甲基甲酰胺（DMF）中合成。对于含有水杨酸的固态铜（II）配合物，在室温下观察到强烈的青色发射，量子产率为12%，荧光寿命约为10毫秒。因此，含水杨酸的铜（II）配合物是光活性材料的极佳候选物。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）表明，二价铜金属中心与共轭配体的氮和氧孤对配位。所有三种铜（II）配合物较低轨道核心电子的XPS结合能趋势相似：相对于未稀释配体，氮1s和氧1s结合能增加，相对于CuCl2，铜2p3/2结合能降低。这些铜配合物的热行为表明，热稳定性具有以下特征：Cu(1,10 - 菲咯啉)(水杨酸) > Cu(1,10 - 菲咯啉)(2,2'-联吡啶) > Cu(1,10 - 菲咯啉)(1 - 苄基咪唑)₂ 。