多枝状罗丹明酰腙类比色探针的合成及对Cu2 的识别研究

Multi-branched rhodamine Colorimetric Probe: synthesis and recognition for Cu2

摘要:

将罗丹明酰肼和2,4,6-三甲酰基间苯三酚缩合得到多枝状苯三酚-罗丹明酰腙类比色探针分子 RbTP。该探针在丙酮-水溶液中可以快速识别Cu2+，并具有良好的灵敏度和抗干扰能力，其它共存离子如Ag+、Al3+、Fe2+、Fe3+、Zn2+、Pb2+、Ni2+、Cd2+、Co2+和Hg2+无光谱响应。探针在556 nm处最大吸收强度与加入的Cu2 体积（0~36 μL）之间呈良好的线性关系，探针对Cu2+ 的检测限约为1.33*10-6 mol/L。将探针溶液中分别加入Cu2+和EDTA循环5次，RbTP仍然能可逆性检测出Cu2+。循环实验和Job's Plot测试证实RbTP与Cu2+通过络合过程发生快速响应，二者的化学计量比为1:3。

Abstract:

In this paper, a multi-branched colorimetric rhodamine triformylphloroglucinol hydrazone probe RbTP was prepared by condensation reaction between rhodamine hydrazide and 2,4,6-Triformylphloroglucinol. In aqueous acetone solution, the probe can quickly recognize Cu2+ with good sensitivity and anti-interference ability, whereas other ions including Ag+ , Al3+, Fe2+, Fe3+, Zn2+, Pb2+, Ni2+, Cd2+, Co2+ and Hg2+ showed no such spectral change. There was a good linear relationship between the maximum absorption intensity and the volume of Cu2+ (0~36 μL). The limit of detection (LOD) for Cu2+ was estimated to be to 1.33?10-6 mol/L. After 5 times periodically alternating addition of Cu2+ and EDTA, the probe could still detect Cu2+ reversibly. The cyclic experiment and Job's Plot test confirmed that the reaction between RbTP and Cu2+ was through the complexation process and the stoichiometric ratio was 1:3.