Structural sources of chiral discrimination in diastereoisomeric Ru(II) complexes of aromatic aminoacids and diimines

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Abstract

The single-crystal structure of a previously reported Ru(II) complex salt, Δ-[Ru(bpy)2(S-tyr)]ClO4·benzene (bpy = 2,2′-bipyridyl; tyr = tyrosinato) has been refined in its correct setting. Its stability in the solid state is ascribed to the influence of a combination of intra- and intermolecular CH-π, π-π and π-facial interactions involving the aromatic rings of the ligands and the benzene of crystallization. The single-crystal structure of a previously reported Ru(II) complex salt, Δ-[Ru(bpy)2(S-tyr)]ClO4·benzene (bpy = 2,2′-bipyridyl; tyr = tyrosinato) has been refined in its correct setting. The salt contains the cation that is thermodynamically unstable in aqueous solution at 298 K with respect to the Λ diastereoisomer. Its stability in the solid state is ascribed to the influence of intramolecular NH-π and CH-π interactions involving the aromatic ring of the aminoacidate with the amine group and a pyridyl ring of one of the diimine ligands. The benzene of crystallization is involved with similar CH-π, π-π and π-facial interactions with the bpy and tyrosinato ligands, and this too may serve to stabilize the particular diastereoisomer in the lattice. © 2004 Published by Elsevier B.V.

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Emseis, P., Leverett, P., Williams, P. A., & Butcher, R. J. (2004). Structural sources of chiral discrimination in diastereoisomeric Ru(II) complexes of aromatic aminoacids and diimines. Inorganica Chimica Acta, 357(15), 4614–4617. https://doi.org/10.1016/j.ica.2004.06.062

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