Abstract
Diene-ruthenium(II) complexes of the sulphur-containing amino acids d, l-methionine ( d, l-metH), d, l-penicillamine ( d, l-penH) and d, l-cysteine ( d, l-cysH) and of d, l-methionine methyl ester ( d, l-metme) have been prepared by their reaction of the amino acids or esters with [(diene)RuCl 2] n (diene = norbornadiene (nbd), 1,5-cyclooctadiene (cod)) in methanol at reflux. Crystal structures are reported for [(nbd)Ru( d, l-metme)Cl 2] ( 1), [(nbd)Ru(d,l-met)Cl]·CH 3OH ( 2) and [(nbd)Ru( d, l-penH −1)] 2·EtOH·HCl ( 3), in which the amino acid ligands are respectively bi-, tri- and tetra-dentate, with S, N-, S, N, O- and S, S, N, O-coordination. Spectroscopic evidence suggests that, in contrast to 3, the d, l-cysteinate ligands are tridentate ( S, S, N-coordination) in dimeric [(cod)Ru( d, l-cys)Cl] 2 ( 4).
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