期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201902240
关键词
aggregation-induced emission; amine detection; in vivo acid-base mapping; multicomponent polymerizations; ratiometric pH sensor
类别
资金
- National Science Foundation of China [21788102, 21490570, 21490574]
- Research Grants Council of Hong Kong [16308116, C6009-17G, A_HKUST605/16]
- Innovation and Technology Commission [ITC-CNERC14SC01, ITS/254/17]
- Science and Technology Plan of Shenzhen [JCYJ20160229205601482, JCY20170307173739739, JCYJ20170818113602462]
Acid-base homeostasis is crucial for normal physiology, metabolism, and functions of living organisms. Thus, the development of effective techniques to monitor it either in vitro or in vivo is in great demand. Herein, a series of multifunctional oxazine-containing polyheterocycles with aggregation-induced emission characteristics are in situ generated by metal-free one-pot A(3) polymerizations of terminal diynes, dialdehydes, and ureas. Most of the polymers are synthesized with high molecular weights (M-w up to 49 900) in nearly quantitative yields and display intense solid-state emission and remarkable fluorescence response to protonation and deprotonation. Based on the unique photophysical properties, a fast responsive and reversible fluorescent sensor for ammonia with a detection limit of 960 ppb is achieved and applied for detecting biogenic amines and seafood spoilage. Besides, the polymeric nanoparticles show excellent lysosome-targeting specificity in cell imaging. The polyheterocycles show ratiometric pH sensing behavior with a broad acid-base response window from pH 1 to 9, which shed light on visualizing physiologic pH in gastrointestinal tract. Taking freshwater Cladocera Moina macrocopa as a model organism, in vivo mapping of its intestinal pH shows an increased pH gradient approximately from 4.2 to 7.8 along the foregut, midgut, and hindgut.
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