Zhu Chengfeng, Wang Yunfei, Mao Qingqing, Li Fang, Li Yougui, Chen Changle
School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China.
Department of Polymer Science and Engineering, University of Science & Technology of China, Jinzhai Rd. 96, Hefei 230026, China.
Materials (Basel). 2017 Mar 18;10(3):313. doi: 10.3390/ma10030313.
Two new Cr(III) complexes based on 2-substituted 8-hydroxyquinoline ligands, namely [Cr(L₁)₃] (1), (HL₁=(E)-2-[2-(4-nitro-phenyl)-vinyl]-8-hydroxy-quinoline) and [Cr(L₂)₃] (2), (HL₂=(E)-2-[2-(4-chloro-phenyl)vinyl]-8-hydroxy-quinoline), were prepared by a facile hydrothermal method and characterized thoroughly by single crystal X-ray diffraction, powder X-ray diffraction, FTIR, TGA, ESI-MS, UV-Visible absorption spectra and fluorescence emission spectra. Single crystal X-ray diffraction analyses showed that the two compounds featured 3D supramolecular architectures constructed from noncovalent interactions, such as π···π stacking, C-H···π, C-H···O, C-Cl···π, C-H···Cl interactions. The thermogravimetric analysis and ESI-MS study of compounds 1 and 2 suggested that the Cr(III) complexes possessed good stability both in solid and solution. In addition, the ultraviolet and fluorescence response of the HL₁ and HL₂ shown marked changes upon their complexation with Cr(III) ion, which indicated that the two 8-hydroxyquinolinate based ligand are promising heavy metal chelating agent for Cr.
基于2-取代8-羟基喹啉配体的两种新型Cr(III)配合物，即[Cr(L₁)₃] (1)，(HL₁ = (E)-2-[2-(4-硝基苯基)-乙烯基]-8-羟基喹啉) 和 [Cr(L₂)₃] (2)，(HL₂ = (E)-2-[2-(4-氯苯基)乙烯基]-8-羟基喹啉)，通过简便的水热法制备，并通过单晶X射线衍射、粉末X射线衍射、傅里叶变换红外光谱、热重分析、电喷雾电离质谱、紫外可见吸收光谱和荧光发射光谱进行了全面表征。单晶X射线衍射分析表明，这两种化合物具有由非共价相互作用构建的三维超分子结构，如π···π堆积、C-H···π、C-H···O、C-Cl···π、C-H···Cl相互作用。对化合物1和2的热重分析和电喷雾电离质谱研究表明，Cr(III)配合物在固体和溶液中均具有良好的稳定性。此外，HL₁和HL₂与Cr(III)离子络合后，其紫外和荧光响应发生了显著变化，这表明两种基于8-羟基喹啉酸的配体是有前景的Cr重金属螯合剂。
