一种基于席夫碱的用于检测Zn2+的高灵敏度和高选择性荧光化学传感器。
A highly sensitive and selective fluorescent chemosensor for detection of Zn2+ based on a Schiff base.
作者信息
Roy Nayan, Pramanik Harun A R, Paul Pradip C, Singh T Sanjoy
机构信息
Department of Chemistry, Assam University, Silchar, Assam 788 011, India.
Department of Chemistry, Assam University, Silchar, Assam 788 011, India.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Apr 5;140:150-5. doi: 10.1016/j.saa.2014.12.106. Epub 2015 Jan 5.
A Schiff-base fluorescent probe - 2-((E)-(quinolin-8-ylimino)methyl)quinolin-8-ol (H7L) was synthesized and evaluated as a chemoselective Zn2+ sensor. Upon treatment with Zn2+, the complexation of H7L with Zn2+ resulted in a red shift with a pronounced enhancement in the fluorescence emission intensity in ethanol solution. Moreover, other common alkali, alkaline earth and transition metal ions failed to induce response or minimal spectral changes. Notably, this chemosensor could distinguish clearly Zn2+ from Cd2+. Fluorescence studies on H7L and H7L-Zn2+ complex reveal that the quantum yield strongly increases upon coordination. The stoichiometric ratio and association constant were evaluated using Benesi-Hildebrand relation giving 1:1 stoichiometry. This further corroborated 1:1 complex formation based on Job's plot analyses. This chemosensor exhibits a very good fluorescence sensing ability to Zn2+ over a wide range of pH.
合成了一种席夫碱荧光探针——2-((E)-(喹啉-8-基亚氨基)甲基)喹啉-8-醇(H7L)，并将其作为一种对锌离子具有化学选择性的传感器进行了评估。在加入锌离子后，H_{7}L与锌离子的络合导致乙醇溶液中的荧光发射强度显著增强且发生红移。此外，其他常见碱金属、碱土金属和过渡金属离子未能引发响应或仅引起最小的光谱变化。值得注意的是，这种化学传感器能够清晰地区分锌离子和镉离子。对H_{7}L和H_{7}L-Zn^{2+}络合物的荧光研究表明，配位后量子产率显著增加。使用贝内西-希尔德布兰德关系式评估化学计量比和缔合常数，得出化学计量比为(1:1)。基于乔布氏图分析，这进一步证实了(1:1)络合物的形成。这种化学传感器在很宽的pH范围内对锌离子都表现出非常好的荧光传感能力。
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