Citation:
HE Wen-Wei, LIAO Wu-Ping, NIU Chun-Ji, LI De-Qian. Determination of Some Basic Constants of P-tert-butylcalixarene Acetic Acid via Two-phase Titration Method[J]. Chinese Journal of Applied Chemistry,
;2008, 25(8): 877-881.
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Some basic constants of p-tert-butylcalixarene acetic acid tBu[4]CH2COOH and tBu[6]CH2COOH including solubility(S) in water, dissociation constant(Ka) in aqueous solution, dimerization constant(K2) and distribution constant(KD) between water and chloroform were determined at 25℃ by two-phase titration method. The results are as follows: tBu[4]CH2COOH: S4=(2.03±0.04)×10-4 mol/L, Ka,4=(1.50±0.02)×10-5, KD,4=1.55×102 and K2,4=3.73×102. tBu[6]CH2COOH: S6=(1.25±0.05)×10-4 mol/L, Ka,4=(8.71±0.05)×10-6, KD,6=1.28×102 and K2,6=3.88×102.
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Keywords:
- calixarene,
- two-phase titration,
- constants,
- determination
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