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Pyrazine luminogens with “free” and “locked” phenyl rings: Understanding of restriction of intramolecular rotation as a cause for aggregation-induced emission
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Figures

Image of FIG. 1.

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FIG. 1.

Examples of propeller-shaped AIE molecules developed in our laboratories.

Image of FIG. 2.

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FIG. 2.

(a) PL spectra of 1 in pure THF and THF/water mixtures. and . Inset: plot of vs solvent composition (where and are the integrated areas of the PL peaks in THF and THF/water mixture, respectively). (b) PL spectra of 1 in the solvents with different polarity parameters . and .

Image of FIG. 3.

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FIG. 3.

(a) PL spectra of 2 in pure THF and THF/water mixtures. (b) Plot of vs solvent composition of THF/water mixture. and .

Image of FIG. 4.

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FIG. 4.

Perspective views of the packing arrangements in crystals of (a) 1 and (b) 2.

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/content/aip/journal/apl/94/25/10.1063/1.3137166
2009-06-26
2014-04-25

Abstract

Nitrogen-containing heterocyclic pyrazine luminogens with “free” (1) and “locked” (2) phenyl rings were readily prepared in high yields. The propeller-shaped luminogen 1 shows aggregation-induced emission feature, whereas the disk-shaped chromophore 2 shows conventional aggregation-caused quenching effect, offering a direct evidence to support our hypothesis that restriction of intramolecular rotation is the main cause for the AIE phenomenon.

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Scitation: Pyrazine luminogens with “free” and “locked” phenyl rings: Understanding of restriction of intramolecular rotation as a cause for aggregation-induced emission
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/25/10.1063/1.3137166
10.1063/1.3137166
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