There is a positive trend of the increase in Δ V in the case of compounds 3 and 5 , which can be caused by a gradual change from C 2 symmetry of calixarenes to C 4v possessing higher dipole moment with an increase in surface pressure.
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Thermally Stable Nitrothiacalixarene Chromophores: Conformational Study and Aggregation Behavior.
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