Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 276, Issue -, Pages 1-6Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2018.11.158
Keywords
Molecular rotor; Viscosity sensor; Fluorescence; Hydrocarbons; Silicone oils
Funding
- Basic Science Research Program of National Research Foundation of Korea (NRF) - Korea government (MEST) [2017R1A2B4007348, 2017R1A6A3A11034225]
- National Research Foundation of Korea [2017R1A6A3A11034225, 2017R1A2B4007348] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Three different tetraphenylethylene derivatives (TPE18, TPE8, TPE1) with different-length alkyl chains (octadecyl, octyl, methyl) were prepared, and their viscosity (eta) sensitivities were examined for hydrocarbons and silicone oils. Both TPE18 and TPE8 dissolved in the fluids very well, except for the case of TPE8 in silicone oils, while TPE1 remained undissolved. In order to examine the viscosity sensitivity, the hydrodynamic fluorescence (FL) emission behaviors of TPE18 and TPE8 were investigated. The FL intensity (I) significantly increased as the eta of the fluid increased. The relationship between I and eta was expressed by the Forster-Hoffmann equation log I = C + x log eta. TPE18 and TPE8 exhibited extremely high x values of 0.63 and 0.70, respectively, for higher alkanes (eta 134-84.0 cP); the corresponding x values were 0.73 and 0.63 for lower alkanes (eta 0.29-1.70 cP). The slight difference in the x value between the two derivatives was due to the difference in their molecular affinity to the fluids. On the other hand, TPE18 dissolved well in silicone oils, while TPE8 did not dissolve completely. The x value of TPE18 was determined to be 0.16, which was much smaller than those for hydrocarbon fluids. (C) 2018 Elsevier B.V. All rights reserved.
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