Mechanism of complex formation between [AuCl4]- and l-methionine
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2009
Authors
Vujačić, Ana V.
Savić, J.Z.
Sovilj, Sofija P.
Mészáros, Szécsényi K.
Todorović, Nina

Petković, M.Z.
Vasić, Vesna M.

Article (Published version)

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The kinetics of the reaction between the tetrachloroaurate(III) ion and l-methionine (l-Met) (0.1 M HClO4, pH 1.0-2.5) have been studied spectrophotometrically using a stopped-flow technique at different temperatures. Initially, the fast substitution reaction was ascribed to the formation of the short-lived square-planar Au(III)-(l-Met) that was followed by the replacement of a Cl- ligand and a subsequent, slower reduction to Au(I)-(l-Met). This is an intermolecular process, involving attack on the [AuCl4]- complex by an outer-sphere l-methionine. The activation parameters (ΔH≠ and ΔS≠) for substitution and reduction were determined. IR spectroscopy indicates that l-methionine acts as a bidentate ligand, most likely coordinating via the S and N atoms, while 1H and 13C NMR data indicate methionine sulfoxide as the final product. Finally, the components of the reaction were treated thermally in order to investigate the solid phase synthesis of the resulting complex.
Keywords:
Complex formation / Gold(III) / Kinetics / l-MethionineSource:
Polyhedron, 2009, 28, 3, 593-599Publisher:
- Oxford : Pergamon-Elsevier Science Ltd
Funding / projects:
DOI: 10.1016/j.poly.2008.11.045
ISSN: 0277-5387
WoS: 000264236000027
Scopus: 2-s2.0-59649108170
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IHTMTY - JOUR AU - Vujačić, Ana V. AU - Savić, J.Z. AU - Sovilj, Sofija P. AU - Mészáros, Szécsényi K. AU - Todorović, Nina AU - Petković, M.Z. AU - Vasić, Vesna M. PY - 2009 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/601 AB - The kinetics of the reaction between the tetrachloroaurate(III) ion and l-methionine (l-Met) (0.1 M HClO4, pH 1.0-2.5) have been studied spectrophotometrically using a stopped-flow technique at different temperatures. Initially, the fast substitution reaction was ascribed to the formation of the short-lived square-planar Au(III)-(l-Met) that was followed by the replacement of a Cl- ligand and a subsequent, slower reduction to Au(I)-(l-Met). This is an intermolecular process, involving attack on the [AuCl4]- complex by an outer-sphere l-methionine. The activation parameters (ΔH≠ and ΔS≠) for substitution and reduction were determined. IR spectroscopy indicates that l-methionine acts as a bidentate ligand, most likely coordinating via the S and N atoms, while 1H and 13C NMR data indicate methionine sulfoxide as the final product. Finally, the components of the reaction were treated thermally in order to investigate the solid phase synthesis of the resulting complex. PB - Oxford : Pergamon-Elsevier Science Ltd T2 - Polyhedron T1 - Mechanism of complex formation between [AuCl4]- and l-methionine VL - 28 IS - 3 SP - 593 EP - 599 DO - 10.1016/j.poly.2008.11.045 ER -
@article{ author = "Vujačić, Ana V. and Savić, J.Z. and Sovilj, Sofija P. and Mészáros, Szécsényi K. and Todorović, Nina and Petković, M.Z. and Vasić, Vesna M.", year = "2009", abstract = "The kinetics of the reaction between the tetrachloroaurate(III) ion and l-methionine (l-Met) (0.1 M HClO4, pH 1.0-2.5) have been studied spectrophotometrically using a stopped-flow technique at different temperatures. Initially, the fast substitution reaction was ascribed to the formation of the short-lived square-planar Au(III)-(l-Met) that was followed by the replacement of a Cl- ligand and a subsequent, slower reduction to Au(I)-(l-Met). This is an intermolecular process, involving attack on the [AuCl4]- complex by an outer-sphere l-methionine. The activation parameters (ΔH≠ and ΔS≠) for substitution and reduction were determined. IR spectroscopy indicates that l-methionine acts as a bidentate ligand, most likely coordinating via the S and N atoms, while 1H and 13C NMR data indicate methionine sulfoxide as the final product. Finally, the components of the reaction were treated thermally in order to investigate the solid phase synthesis of the resulting complex.", publisher = "Oxford : Pergamon-Elsevier Science Ltd", journal = "Polyhedron", title = "Mechanism of complex formation between [AuCl4]- and l-methionine", volume = "28", number = "3", pages = "593-599", doi = "10.1016/j.poly.2008.11.045" }
Vujačić, A. V., Savić, J.Z., Sovilj, S. P., Mészáros, S. K., Todorović, N., Petković, M.Z.,& Vasić, V. M.. (2009). Mechanism of complex formation between [AuCl4]- and l-methionine. in Polyhedron Oxford : Pergamon-Elsevier Science Ltd., 28(3), 593-599. https://doi.org/10.1016/j.poly.2008.11.045
Vujačić AV, Savić J, Sovilj SP, Mészáros SK, Todorović N, Petković M, Vasić VM. Mechanism of complex formation between [AuCl4]- and l-methionine. in Polyhedron. 2009;28(3):593-599. doi:10.1016/j.poly.2008.11.045 .
Vujačić, Ana V., Savić, J.Z., Sovilj, Sofija P., Mészáros, Szécsényi K., Todorović, Nina, Petković, M.Z., Vasić, Vesna M., "Mechanism of complex formation between [AuCl4]- and l-methionine" in Polyhedron, 28, no. 3 (2009):593-599, https://doi.org/10.1016/j.poly.2008.11.045 . .