Three different fluorescent responses to transition metal ions using receptors based on 1,2-bis- and 1,2,4,5-tetrakis-(8-hydroxyquinolinoxymethyl)benzene
作者:Prabhpreet Singh、Subodh Kumar
DOI:10.1016/j.tet.2006.04.035
日期:2006.6
‘OFF–ON’ due to metal ion coordination of different transition metal ions and 1, 3, and 5 placement of three quinolines in tripod 7, the protonation of quinolines is preferred over metal ion coordination. In general, the greater number of quinoline units coordinated per metal ion in 5 compared with the other podands points to organization of the four quinoline moieties around metal ions in the case of 5
所述dipod 1,2-双(8- hydroxyquinolinoxymethyl)苯(3)和四脚1,2,4,5-四(8- hydroxyquinolinoxymethyl)苯(5)已经被通过各自的1,2-双亲核取代(合成溴甲基)苯(2)和1,2,4,5-四(溴甲基)苯(4)与8-羟基喹啉(1)。为了比较,已经获得了1,3,5-三(8-羟基喹啉氧基甲基)苯衍生物(7a和7b)。这些配体对Ag +,Co 2 +,Ni 2 +,Cu 2 +,Zn 2+和Cd 2+的络合行为金属离子已在乙腈中通过荧光光谱法进行了研究。空间位挤1,2,4,5-四足5个显示独特荧光“ON-OFF-ON”通过荧光淬灭(开关λ最大395nm处,开关OFF)与<银的1.0当量+和荧光增强(λ最大495纳米,将ON切换为> 3当量的Ag +,可用于估算在两种不同波长下两种不同的Ag +浓度。在四脚架5中添加Cu 2 +,Ni