鈥淔astening鈥?Porphyrin in Highly Cross-Linked Polyphosphazene Hybrid Nanoparticles: Powerful Red Fluorescent Probe for Detecting Mercury Ion

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• 作者：Ying Hu ; Lingjie Meng ; Qinghua Lu
• 刊名：Langmuir
• 出版年：2014
• 出版时间：April 22, 2014
• 年：2014
• 卷：30
• 期：15
• 页码：4458-4464
• 全文大小：413K
• 年卷期：v.30,no.15(April 22, 2014)
• ISSN：1520-5827

文摘

It is a significant issue to overcome the concentration-quenching effect of the small fluorescent probes and maintain the high fluorescent efficiency at high concentration for sensitive and selective fluorescent mark or detection. We developed a new strategy to 鈥渋solate鈥?and 鈥渇asten鈥?porphyrin moieties in a highly cross-linked poly(tetraphenylporphyrin-co-cyclotriphosphazene) (TPP鈥揚ZS) by the polycondensation of hexachlorocyclotriphosphazene (HCCP) and 5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin (TPP-(OH)₄) in a suitable solvent. The resulting TPP鈥揚ZS particles were characterized with transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), ³¹P nuclear magnetic resonance (NMR), and ultraviolet and visible (UV鈥搗is) absorption spectra. Remarkably, TPP鈥揚ZS particles obtained in acetone emitted a bright red fluorescence both in powder state and in solution because the aggregation of porphyrin moieties in 鈥淗-type鈥?(face-to-face) and 鈥淛-type鈥?(edge-to-edge) was effectively blocked. The fluorescent TPP鈥揚ZS particles also showed superior resistance to photobleaching, and had a high sensitivity and selectivity for the detection of Hg²⁺ ions. The TPP鈥揚ZS particles were therefore used as an ideal material for preparing test strips to quickly detect/monitor the Hg²⁺ ions in a facile way.