A highly selective fluorescent sensor for Cu2+ based on a covalently immobilized naphthalimide derivative.
In this paper, we describe the fabrication and analytical characteristics of fluorescence-based copper ion-sensing glass slides. To construct the sensor, a naphthalimide derivative N-allyl-4-(bis(pyridin-2-ylmethyl)amino)ethylamino-1,8-naphthalimide (1) with a terminal double bond was synthesized and photo-copolymerized with 2-hydroxyethyl methacrylate (HEMA) on a glass surface treated with a silanizing agent. In the presence of Cu(2+) at pH 7.24, the resulting optical sensor undergoes fluorescence quenching. Thus, the proposed sensor with visible excitation can behave as a fluorescent sensor for the selective detection of Cu(2+). In addition, the sensor exhibits satisfactory selectivity, reproducibility and response time. The sensing membrane possesses a relatively long lifetime of at least 2 months. The linear response range covers a concentration range of Cu(2+) from 4.0 x 10(-7) to 6.0 x 10(-4) mol/L and the detection limit is 2.0 x 10(-7) mol/L. The determination of Cu(2+) in river water samples shows satisfactory results.
Zhao
Xu-Hua
XH
State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
Ma
Qiu-Juan
QJ
Zhang
Xiao-Bing
XB
Huang
Bo
B
Jiang
Qin
Q
Zhang
Jing
J
Shen
Guo-Li
GL
Yu
Ru-Qin
RQ
D002413:Cations, Divalent / Q000032:analysis / Q000737:chemistry; D003300:Copper / Q000032:analysis* / Q000737:chemistry; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D005898:Glass / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D008689:Methacrylates / Q000737:chemistry; D053644:Naphthalimides / Q000138:chemical synthesis / Q000737:chemistry*; D010777:Photochemistry; D015203:Reproducibility of Results; D045483:Rivers / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis
D002413:Cations, Divalent; D005456:Fluorescent Dyes; D008689:Methacrylates; D053644:Naphthalimides; D012821:Silanes; D014874:Water Pollutants, Chemical; C005044:hydroxyethyl methacrylate; D003300:Copper