@article{ goldenberg_spectroscopic_2000,
  title = {Spectroscopic study of azo- and azoxycrowns binding with cations of similar ionic radius},
  volume = {38},
  issn = {0923-0750},
  url = {http://dx.doi.org/10.1023/a:1008149510474},
  doi = {<Go to ISI>://WOS:000089144500015},
  abstract = {The complexation of 13- and 16-membered azo- and azoxycrowns with metal cations of similar ionic diameter (Na+ and Ca2+; and K+, Ba2+, Ag+ and Pb2+) was studied by uv/visible spectroscopic titration in acetonitrile and {MeOH.} In {MeOH} the 13-membered azo- and azoxycrowns 1 and 2 are weakly and non-selectively bound to hard cations of similar ionic diameter, but different charge (Na+ and Ca2+). At the same time the binding to the soft cation Ag+ of larger size than the macrocycle cavity is considerably stronger. In contrast to solutions in acetonitrile no binding with the small Li+ cation was found. The 16-membered azocrowns 3 and 4 also discriminate silver cation in {MeOH} with log K = 3.65 +/- 0.1 for both compounds. Unexpectedly low binding with the hard barium divalent cation of similar size (log K = 1.55 +/- 0.4 and 1.95 +/- 0.2, respectively) was found for these compounds. Similarly to 13-membered compounds no binding with the small Li+ cation was detected. A reverse order of selectivity was observed for these crowns in acetonitrile with binding constant for association of 3 with Ba2+ (log K greater than or equal to 5.3) considerably higher than for other cations. The previously observed strong binding with the smaller Li+ and Na+ cations is confirmed.},
  number = {1-4},
  journal = {Journal of Inclusion Phenomena and Macrocyclic Chemistry},
  author = {Goldenberg, L. M. and Denisov, N. N. and Biernat, J. F.},
  year = {2000},
  pages = {171--186}
}

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