对称Salamo型Cu(Ⅱ)配合物的合成、晶体结构及荧光性质

Synthesis,Crystal Structureand Fluorescent Properties of the Symmetric Salamo-type Cu(Ⅱ) Complex

首先以1,2-二胺氧乙烷与2-羟基-5-溴苯乙酮为原料合成了一种新的Salamo型双肟配体H2L.在室温下,用该配体(H2L)与Cu(OAc)2·H2O在丙酮和乙醇的混合溶液中反应,得到了一种新的双核铜(Ⅱ)配合物,即:[Cu2(L)2].通过红外光谱、紫外-可见光谱和X-射线单晶衍射法对配合物进行了表征发现该配合物的晶体结构单元中含有两个Cu(Ⅱ)原子和两个完全去质子的配体(L)2-单元,其中Cu1和Cu2原子分别形成了一种扭曲的4配位平面四边形(Cu1)和5配位四方锥(Cu2)几何构型.在320 nm的激发波长下对Cu(Ⅱ)配合物的荧光进行测试,结果表明,当加入Cu(Ⅱ)离子后,该配合物发生荧光淬灭现象.

In this paper,a new Salamo-type bisoxime ligand H2L was firstly synthesized by using 1,2-diamine oxyethane and 2-hydroxy-5-bromoacetophenone as raw materials.Then,the ligand(H2L)was reacted with Cu(OAc)2·H2O in a mixed solution of acetone and ethanol at room temperature to obtain a new binuclear copper(Ⅱ)complex:[Cu2(L)2].The complex was characterized by methods of IR,UV-Vis spectra and X-ray single crystal diffraction method,and it was found that the crystal unit of the complex[Cu2(L)2]contained two Cu(Ⅱ)atoms and two fully deprotonated ligand(L)2-units,in which Cu1 and Cu2 atoms formed a distorted four-coordinated plane coordination environment and a distorted five-coordinated square pyramidal(Cu2)coordination environment respectively.The fluorescence of Cu(Ⅱ)complex was tested at an excitation wavelength of 320 nm,and the results showed that the quenching phenomenon of the complex occurred when Cu(Ⅱ)ion was added.