A new perylene diimide-based colorimetric and fluorescent sensor for selective detection of Cu2+ cation

• 来源期刊: 中国科学B辑（英文版）
• 年，卷（期）: 2009,（4）
• 页码范围: 518-522
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11426-009-0041-z

摘要

A new perylene diimide (PDI) ligand (1) functionalized with a dipicolylethylenediamine (DPEN) moiety was synthesized and first used as a colorimetric and fluorometric dual-channel sensor to specifically detect the presence of Cu2+ over a wide range of other cations. The solution of 1 (10 μmol/L) upon ad-dition of Cu2+ displayed distinguishing pink color compared with other cations including K+, Ni2+, Ca2+,Mn2+, Na+, Sr2+, Zn2+, Co2+, Cd2+, Mg2+, Cr3+, Ag2+, and Ba2+, indicating the sensitivity and selectivity of 1 to Cu2+. Thus, the advantage of this assay is that naked-eye detection of Cu2+ becomes possible. More-over, among these metal ions investigated, only Cu2+ quenched more than half fluorescent intensity of 1. The ESI-TOF spectrum of a mixture of I and CuCl2 in combination of the fluorescence titration spec-tra of 1 (10 μmol/L) upon addition of various amounts of Cu2+ revealed the formation of a 2:1 metal-ligand complex through the metal coordination interaction.