Enhancement of Hydrolysis through the Formation of MixedHeterometal Species: Al3+/CH3Sn3+ Mixtures

Alba Giacalone, Antonio Gianguzza, Rosalia M. Cigala, Silvio Sammartano, Concetta De Stefano

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Abstract

ABSTRACT: The hydrolysis of mixed-metal cations (Al3+/CH3Sn3+)was studied in aqueous solutions of NaNO3, at I = 1.00 ± 0.05mol·dm−3 and T = 298.15 K, by potentiometric technique. Severalhydrolytic mixed species are formed in this mixed system, namely,Alp(CH3Sn)q(OH)r with (p, q, r) = (1, 1, 4), (1, 1, 5), (1, 1, 6), (2, 1,4), (1, 2, 5), (1, 4, 11), (1, 3, 8), and (7, 6, 32). The stability of thesespecies, expressed by the equilibrium: pAl3+ + qCH3Sn3+ + rOH− =Alp(CH3Sn)q(OH)r3(p+q)−r, βpqrOH, can be modeled by the empiricalrelationship: log βpqrOH = −3.34 + 2.67p + 9.23(q + r). By using theequilibrium constant Xpqr relative to the formation reaction:pAl(p+q)(OH)r + q(CH3Sn)(p+q)(OH)r = (p + q)Alp(CH3Sn)q(OH)r,it was found that the formation of heterometal mixed species isthermodynamically favored, and the extra stability can be expressed asa function of the difference in the stability of parent homometal species. This leads, in turn, to a significant enhancement ofhydrolysis and solubility.
Lingua originaleEnglish
pagine (da-a)821-826
Numero di pagine6
RivistaJournal of Chemical and Engineering Data
Volume58
Stato di pubblicazionePublished - 2013

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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