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Issue 24, 2013
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Phenylalanine – a biogenic ligand with flexible η6- and η61-coordination at ruthenium(ii) centres

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The reaction of (S)-2,5-dihydrophenylalanine 1 with ruthenium(III) chloride yields the μ-chloro-bridged dimeric η6-phenylalanine ethyl ester complex 3, which can be converted into the monomeric analogue, η61-phenylalanine ethyl ester complex 12, under basic conditions. Studies were carried out to determine the stability and reactivity of complexes bearing η6- and η61-chelating phenylalanine ligands under various conditions. Reaction of 3 with ethylenediamine derivatives N-p-tosylethylenediamine or 1,4-di-N-p-tosylethylenediamine results in the formation of monomeric η61-phenylalanine ethyl ester complexes 14 and 15, which could be saponified yielding complexes 16 and 17 without changing the inner coordination sphere of the metal centre. The structure of η61-phenylalanine complex 17 and an N1-phenylalanine complex 13 resulting from the reaction of 3 with an excess of pyridine were confirmed by X-ray crystallography.

Graphical abstract: Phenylalanine – a biogenic ligand with flexible η6- and η6:κ1-coordination at ruthenium(ii) centres

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Article information

04 Mar 2013
10 Apr 2013
First published
10 Apr 2013

Dalton Trans., 2013,42, 8692-8703
Article type

Phenylalanine – a biogenic ligand with flexible η6- and η61-coordination at ruthenium(II) centres

T. Reiner, D. Jantke, X. Miao, A. N. Marziale, F. J. Kiefer and J. Eppinger, Dalton Trans., 2013, 42, 8692
DOI: 10.1039/C3DT50589H

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