X-ray and NMR Studies of the Interaction Between Pd(II) and S-Methyl-L-cysteine Methyl Ester

Article abstract of DOI:10.1107/S0567740880008515

Both X-ray and NMR results indicated that S-methyl-L-cysteine methyl ester (SmcOMe) is coordinated to Pd(II) through the S and N donors.X-ray studies were performed on crystals of the 1:1 ligand-metal complex.Crystals of dichloro(S-methyl-L-cysteine methyl ester)palladium(II) monohydrate are tetragonal, space group P4₁2₁2, with a = b = 8.309(3), c = 33.860(9) Angstroem, Z = 8.The structure was refined to R = 0.062 for 823 counter reflexions.The coordination around Pd is slightly distorted square planar and involves the S and N atoms of the amino acid molecule and two Cl atoms.The five-membered chelate ring has an envelope-like conformation.The absolute configuration of the ligand was assigned as (3R,SR) with reference to the known R configuration of L-cysteine.