Polymeric thiolate complexes in solution. Stability constants of the zinc(II) complexes of 1-methyl-4-mercaptopiperidine

Joan Carles Bayón, Pilar González-Duarte

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17 Citations (Scopus)

Abstract

The equilibrium reaction between Zn<sup>II</sup> and 1-methyl-4-mercaptopiperidine has been studied by e.m.f. measurements with a glass electrode at 25 °C in a 3 mol dm<sup>-3</sup>(sodium) perchlorate medium [+10% (v/v) CH<inf>3</inf>OH]. Conclusions drawn from graphical methods based on the 'core + links' hypothesis are in agreement with the results obtained from the numerical treatment. The e.m.f. data obtained in the range 4 < -log[H<sup>+</sup>] < 9 can be explained by assuming the existence of the following species: [Zn<inf>3</inf>(HA)<inf>6</inf>]<sup>6+</sup> (log ψ<inf>3, 6</inf> = 39.71 ± 0.01), [Zn<inf>5</inf>(HA)<inf>12</inf>]<sup>10+</sup> (log ψ<inf>5,12</inf> = 79.87 ± 0.01), and [Zn<inf>2</inf>(HA)<inf>6</inf>]<sup>4+</sup> (log ψ<inf>2,6</inf> = 35.26 ± 0.02) where HA is the uncharged ligand. A mechanism for the formation of these species and their possible geometries are suggested.
Original languageEnglish
Pages (from-to)487-492
JournalJournal of the Chemical Society, Dalton Transactions
Issue number3
DOIs
Publication statusPublished - 1 Jan 1982

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