COMPLEX FORMATION OF PALLADIUM(II) WITH ANCHORED THIA-LIGANDS: MACROCYCLES VS. PODANDSтезисы доклада

Дата последнего поиска статьи во внешних источниках: 22 февраля 2018 г.

Работа с тезисами доклада


[1] Complex formation of palladium(ii) with anchored thia-ligands: Macrocycles vs. podands / T. M. Buslaeva, H. V. Ehrlich, S. P. Gromov et al. // The XXVII International Chugaev Conference on Coordination Chemistry. — Novgorod, Russia, 2017. — P. P167. Molecular recognition technology (MRT) is declared as a most prominent approach to selective extraction of rare metals, in particular platinum metals, from aqueous solutions. For technological use the macrocycles responsible for selective binding of metal ions are chemically attached to solid support, i.e. silica [1]. The main barrier for MRT is a high cost of macrocycles with heteroatoms and functional groups in side chains which are necessary for attachment to the support. The alternative is a use of similar linear molecules with the same coordination atoms – podands. So, we have synthesized a set of dithia crown ethers and attached them to silica surface. Typical structure of such sorbents is defined as I. For comparison we have synthesized the sorbent II with anchored di(hydroxyalkyl)sulphide. The quantity of anchored ligands for I and II equals 0.2 and 0.5 mmol/g respectively. The surface density of anchored ligands and the length of spacer in II are high enough for coordination of two ligands with one metal ion with the formation of the structure resembling the coordination with dithia crown ether. The results obtained show that in view of [PdCl4]2- binding sorbents which anchored macrocycles have no advantage over sorbents with analogous podands. Moreover, sorbent II possesses even higher selectivity for Pd(II) binding in the presence of Pt(IV), Rh(III) and Cu(II) as compared to sorbent I. This enabled us to achieve selective extraction of Pd(II) from complex technological solutions containing above mentioned metal ions.

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