Interaction of calix[4]arene and aliphatic amines: A combined NMR, spectrophotometric and conductimetric investigation
Journal of the Brazilian Chemical Society, ISSN: 0103-5053, Vol: 13, Issue: 3, Page: 295-299
2002
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Article Description
The constants related to the equilibria between calix[4]arene and aliphatic amines in acetonitrile were measured by conductimetric and spectrophotometric methods, and the structures of the salts studied by NMR spectroscopy. In concentrations about 10 mol L, free ions are at higher proportion, whereas at 10 mol L there is an increase of ion-pairs proportion. The values of the constants found for acid-base reactions allow an evaluation of the value of pKa for calix[4]arene in acetonitrile as 16.6 pKa units. The analysis of data agrees with a proposal of exo-calix ammonium ion.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0036379533&origin=inward; http://dx.doi.org/10.1590/s0103-50532002000300002; http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000300002&lng=en&nrm=iso&tlng=en; http://www.scielo.br/pdf/jbchs/v13n3/9591.pdf; http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000300002&lng=en&tlng=en; http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-50532002000300002&lng=en&tlng=en; http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000300002; http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-50532002000300002; https://dx.doi.org/10.1590/s0103-50532002000300002; https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000300002&lng=en&nrm=iso&tlng=en
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