In this paper we introduced the formation of a novel type of capsules resulting from the self-association between
oppositely charged complementary building blocks in H2O. The assembly is based on the interaction between tetraphosphonatcalixarenes 1 and tetraammonium calixarene 2 and 3. Evidence for the formation of the expected 1:1 assemblies
is provided by ESI-MS. Isothermal titration calorimetry (ITC) was carried out to measure the enthalpy and entropy
of complex formation for capsule 1+3, with association constants in the range of 106 M-1.
Keywords: Association constant, Calixarene, ESI-MS, ITC, molecular capsule
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