期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 1, 期 31, 页码 4640-4646出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3tc30759j
关键词
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资金
- National Basic Research Program of China (973 Program) [2013CB834701]
- HKUST [RPC11SC09, SRFI11SC03PG]
- Research Grants Council of Hong Kong [HKUST2/CRF/10, N_HKUST620/11]
- University Grants Committee of Hong Kong [AoE/P-03/08]
- Guangdong innovative Research Team Program [201101C0105067115]
In this work, a heteroatom-containing luminogen (TPE-Py) with multi-functionalities was synthesized in a reasonable yield by melding a pyridinium unit with tetraphenylethene through vinyl functionality. TPE-Py is weakly emissive in solution but becomes a strong emitter when aggregated as nanoparticle suspensions in poor solvents or in the solid state, displaying a phenomenon of aggregation-induced emission. Crystallization generally weakens and red-shifts the light emission. The crystalline aggregates of TPE-Py, however, emit stronger and bluer light than their amorphous counterparts. The solid-state emission of TPE-Py can be reversibly switched between green and yellow color by grinding-fuming and grinding-heating processes with a high contrast due to the transformation from the crystalline to the amorphous state and vice versa. The large Stokes shift and well-ordered molecular arrangement of the crystalline microrods of TPE-Py make it promising as an optical waveguide material with a low optical loss coefficient of similar to 0.032 dB mu m(-1). TPE-Py works as a good fluorescent visualizer for specific staining of mitochondria in living cells with a high photostability, thanks to its hydrophobic and cationic features.
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