Page 3 of 3
Journal Name
ChemComm
DOI: 10.1039/C4CC09613D
and 601 nm in pure THF. However, the long wavelength (λem
=
detailed investigation of vibration mechanism is underway by
601 nm) emission receded with the increase of water fraction (fw). means of ultrafast spectroscopies. This successful molecular
When fw = 90 % the solution gives a close white emission (Figure design principleꢀproof is unprecedented and promises potential
2b, CIE 0.28, 0.27). Due to the vibration of phenazine unit was implementation to prepare whiteꢀlight emitting single molecule in
restricted, it only has one blue emission (λem= 450 nm) when the future applications.
fw = 99 %. So the emission gives an orange – white – blue
process for M1
.
Acknowledgements
This work was supported by NSFC/China and the National
Basic Research 973 Program.
Notes and references
a
Key Laboratory for Advanced Materials and Institute of Fine
Chemicals, East China University of Science & Technology, Shanghai
200237, China
b Department of Theoretical Chemistry, Royal Institute of Technology Sꢀ
10691 Stockholm, Sweden
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Fig. 2 (a) The normalized fluorescence spectra of M1 in different water ratios of
THF/H2O excited at 335 nm at 1 x 10-5 M. (b) The chromaticity coordinates (CIE)
for M1 in different ratios of THF/H2O. (c) The fluorescence images of M1 in
different ratios of THF/H2O under 365 nm UV-light.
2
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For better describing the dynamic scene of state
transformational process, we dropped the solution of compound
M1 on silica gel plate for getting a state transform process from
solution to solid (Figure 3). This dynamic process could be
explained by vibration effect. The vibration of the phenazine unit
would be restricted when the solvent was volatilized. So a similar
phenomenon was observed, i. e. the emission give an orange –
white – blue process when the DCM was volatilized in 10
seconds. The whole process could be seen in the video in
Support Information. This phenomenon make the compound
have potential application in detection of organic vapour.
3
4
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Fig. 3 The solution-to-solid transform fluorescence images when M1 (1mg/0.5ml,
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Conclusions
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In summary, a novel phenazine core structure S1 exhibits an
interesting phenomenon: Vibration Induced Emission (VIE), i. e.
two fluorescence peaks in solution but one peak in solid. Based
G. L. Brizius, JꢀL. Brédas, and D. M. Collard, J. Am. Chem. Soc.
,
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on this core unit, some novel compounds (M1
– M4) were
prepared. Such Vibration Induced Emission (VIE) provides novel
approach to obtain near white emission from single organic
molecule (M1 and M2) in two ways: 1) control the intramolecular
energy transfer efficiency; 2) control the vibration ability of
phenazineꢀunit by increasing the water faction in the solvent. VIE
would be one of intrinsic emission of the molecules and the
9
B. Xu, J. Zhang, H. Fang, S. Ma, Q. Chen, H. Sun, C. Im and W.
Tian, Polym. Chem. 2014, 5, 479ꢀ488.
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