Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 21, Pages 10472-10479Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm30620d
Keywords
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Funding
- Research Grants Council of Hong Kong [603509, HKUST2/CRF/10, 604711]
- NSFC/RGC [N_HKUST620/11]
- University Grants Committee of Hong Kong [AoE/P-03/08]
- HKUST [SRFI11SC03PG, RPC11SC09]
- National Science Foundation of China [21104044, 20974028]
- Ph.D. Programs Foundation of Ministry of Education of China [20110073120040]
- Start-up Foundation for New Faculties of Shanghai Jiao Tong University
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Self-assembly of fluorescent functional materials has attracted increasing interest in the fabrication of optoelectronic and biological nanodevices. Tetraphenylethene (TPE) is a typical dye molecule with aggregation-induced-emission (AIE) characteristics. Melding TPE carrying triple-bond functionality with diazide-containing biphenyl through click'' chemistry generates AIE-active luminogens [1,1'-biphenyl]- 4,4'-diyl bis(6-(4-(4-(1,2,2-triphenylvinyl)phenyl)-1H-1,2,3-triazol-1-yl) hexanoate) [1(5)] and [1,1'-biphenyl]-4,4'-diyl bis(11-(4-(4-(1,2,2-triphenylvinyl)phenyl)-1H-1,2,3-triazol-1-yl) undecanoate) [1(10)] with solid state efficiencies up to unity. Slow addition of dilute THF solutions of 1(m) (m 5, 10) into nonsolvents such as n-hexane and water yields self-assembled white wooly solids. TEM and SEM observations reveal the (helical) nanofibrous structure of the aggregates. Upon cooling from their concentrated hot solutions, 1(m) readily precipitate. Meanwhile, they can also form gels at high concentrations. Both precipitates and gels of 1(m) exhibit structures similar to those of the aggregates formed in nonsolvents. These results indicate that 1(m) can facilely self-assemble into high emission efficiency (helical) nanofibers, thus paving the way for their optoelectronic and biological applications.
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