Abstract
The non-symmetrical cobalt (III) complex cis-[Co(Ad)(en)2Cl]Cl (1Cl), possessing two flexible ethylendiaminate chelate rings (en) and monodentate N(9)-bound adeninate (Ad-) was chosen as the guest of p-sulfonatothiacalix[4]arene (STCA) to study the inclusion complex formation at wide range of pH 2–10. It was shown by 1H, NOE NMR methods and pH-metric procedure, that pH-driven variation of the inclusion mode of 1 + into calixarene cavity is the result of the protonation of 1 +via adeninate moiety.
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We thank RFBR (grants N 04-03-32909 and 05-03-32558) and BRHE (grants REC-007 and Y3-C-07-15) for financial support.
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Skripacheva, V.V., Mustafina, A.R., Burilov, V.A. et al. pH-Driven Variation of the Outer-Sphere Binding Mode of cis-[Co(Ad)(en)2Cl]Cl (en-Ethylendiamine, Ad-Adeninate) with p-Sulfonatothiacalix[4]arene. J Incl Phenom Macrocycl Chem 56, 369–374 (2006). https://doi.org/10.1007/s10847-006-9118-x
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DOI: https://doi.org/10.1007/s10847-006-9118-x