Coordination phenomena of alkali metal, alkaline earth metal, and indium ions with the 1,3,6-naphthalenetrisulfonate ion in protic and aprotic solvents

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Abstract

Not only in acetonitrile (MeCN) but also in primary alcohols (from methanol to 1-hexanol), the coordination ability of alkali metal (Li+, Na+), alkaline earth metal (Mg2+, Ca2+, or Ba2+), and indium (In3+) ions with the 1,3,6-naphthalenetrisulfonate ion (L3-, 1.0 x 10(-4) mol dm(-3)) has been examined by means of UV-visible spectroscopy. In MeCN, the precipitation takes place completely between alkali metal or alkaline earth metal ions and L3-. In the presence of excess amounts of the metal ions, the precipitates of Li3L and Mg2L3 tend to re-dissolve partially to form the "reverse" coordinated species of Li4L+ and Mg2L+. However, those precipitates of Na3L, Ca3L2, and Ba3L2 would not re-dissolve even in the presence of large excess amounts of the metal ions in MeCN. Between In3+ and L3-, both precipitation and successive re-dissolution reactions can occur in all the primary alcohols. The solubility products (pK(sp)) and "reverse" coordination constants with L3- (log K4(1+), log K2(2+), and log K2(3+) for alkali metal, alkaline earth metal, and indium ions, respectively) have been evaluated in MeCN, the primary alcohols, and binary solvents of MeCN-H2O and MeCN-MeOH. Where, for instance, K4(1+) = [M4L+]/([M+](4)[L3-]) for the reaction: 4M(+) + L3- reversible arrow M4L+. DFT calculations have been performed to predict the coordinating structures of the Li4L+ species in MeCN. (C) 2016 Elsevier B.V. All rights reserved.

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Details 詳細情報について

  • CRID
    1050564288973840128
  • NII Article ID
    120006382273
  • HANDLE
    2115/68263
  • ISSN
    01677322
  • Text Lang
    en
  • Article Type
    journal article
  • Data Source
    • IRDB
    • CiNii Articles

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