نبذة مختصرة : The tetranitro derivative 3 of thiacalix[4]arene was synthesized and characterized. Its acidbase properties in water solution were studied by UV spectroscopy. The four pKa values of 3 were determined by target testing factor analysis (TTFA). The pure UV absorption curves and pH distribution curves of five forms of 3 presented in aqueous solution were also calculated by TTFA.Key words: thiacalixarene, nitro derivative, acidbase properties.
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