Abstract: Two tetraphenylethene derivatives, i.e. 1,1,2,2-tetra(4-(hexyloxy)phenyl)ethene (THPE) and 1,1,2,2-tetrakis(4-(decyloxy) phenyl)ethene (TDPE) containing alkyl chains with different lengths were prepared. The optical properties of THPE and TDPE in THF/water mixtures with different water contents were investigated by UV-Vis and fluorescence spectroscopy. The structures of the aggregates of THPE and TDPE formed in THF/water mixtures were observed by SEM. Level-off tails in the UV-Vis spectra of THPE and TDPE in THF/water mixtures can be seen as water contents reach the critical points. However, the critical points for the two derivatives differ, as level-off tails were seen in the UV-Vis spectra of THPE and TDPE when water contents reached 50% and 40%, respectively. THPE and TDPE both are AIE active and their fluorescence quantum yields increase with the increasing of water contents. However, the initial points of the rapid growth of their fluorescence quantum yields are different. The fluorescence quantum yields of THPE and TDPE began to quickly increase when their water contents reached 40% and 30%, respectively. THPE and TDPE both can self-assemble into ordered aggregates. THPE can self-assemble into ordered nanorods under 70% water content, and TDPE can self-assemble into ordered nanorods and microplates under only 50% water content. These data indicate that TDPE with longer alkyl chains can aggregate more easily. New AIE materials with high fluorescence quantum yields and structure-controlled aggregates can be expected to be prepared by tuning the lengths of alkyl chains.
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2017, Vol. 31 
