Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 2, Pages 614-618Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am201616r
Keywords
pyrophosphate; perylene diimide; fluorescence; biosensor; aggregation
Funding
- National Natural Science Foundation of China [50973054, 91027028, 50873902]
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A complex between an anionic perylene diimide derivative (PDI-GlyAsp) and cupric ion has been prepared and applied to be turn-on fluorescent probe for the detection of pyrophosphate (PPi) in 100% aqueous solution. The complex formation process and PPi detection have been studied by absorption and emission spectroscopy. It was confirmed that the introduction of cupric ion into PDI-GlyAsp solution resulted in the assembly of PDI-GlyAsp into PDI-GlyAsp/Cu2+ aggregates, leading to the fluorescence quenching of PDI-GlyAsp. Upon addition of PPi into the above solution led to the disassembly of the aggregates due to the competitive binding of PPi with Cu2+ in the PDI-GlyAsp/Cu2+ complex, and a recovery of PDI-GlyAsp emission was observed. Therefore, the PDI-GlyAsp/Cu2+ complex can be applied as a turn on fluorescent probe for detecting PPi with high selectivity and sensitivity.
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