Key Laboratory of Pesticide & Chemical Biology (CCNU), Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, PR China.
Nanoscale. 2009 Oct;1(1):128-32. doi: 10.1039/b9nr00019d. Epub 2009 Aug 28.
Highly luminescent and water-soluble cobalt(ii)-bis(8-hydroxyquinoline) (CoQ(2)) nanosheets have been successfully synthesized via a simple, rapid sonochemical method. The water-soluble CoQ(2) nanosheets were characterized by luminescence spectroscopy, UV-vis spectroscopy, FT-IR spectroscopy and transmission electron microscopy (TEM). The CoQ(2) nanosheets allow highly sensitive and selective determination of p-nitroaniline via fluorescence quenching. Under optimal conditions, the relative fluorescence intensities of nanosheets decreased linearly with increasing p-nitroaniline. However, the sensitivity of CoQ(2) nanosheets toward other aromatic amines including o-diaminobenzene, m-diaminobenzene, p-diaminobenzene, p-toluidine, o-nitroaniline, m-nitroaniline, p-chloroaniline and aniline is negligible. It is found that p-nitroaniline can quench the luminescence of CoQ(2) nanosheets in a concentration-dependent manner that is best described by a Stern-Volmer-type equation. The possible underlying mechanism is discussed.
通过简单、快速的超声化学法成功合成了高发光性和水溶性的钴(ii)-双(8-羟基喹啉)(CoQ(2))纳米片。通过发光光谱、紫外可见光谱、傅里叶变换红外光谱和透射电子显微镜(TEM)对水溶性 CoQ(2)纳米片进行了表征。CoQ(2)纳米片允许通过荧光猝灭对邻硝基苯胺进行高灵敏度和选择性测定。在最佳条件下，纳米片的相对荧光强度随邻硝基苯胺的增加呈线性降低。然而，CoQ(2)纳米片对其他芳香胺，包括邻二氨基苯、间二氨基苯、对二氨基苯、对甲苯胺、邻硝基苯胺、间硝基苯胺、对氯苯胺和苯胺的灵敏度可以忽略不计。研究发现，邻硝基苯胺可以以浓度依赖的方式猝灭 CoQ(2)纳米片的发光，这可以用 Stern-Volmer 型方程很好地描述。讨论了可能的潜在机制。
