Abstract
An air-stable and water-soluble diastereomeric half-sandwich ruthenium(I1) complex, [Ru(η-MeC 6 H 4 Pr i -p)(H 2 O)-(L ∗ )](ClO 4 ) (l), has been isolated and structurally characterized [HL ∗ = (27)-(α-methylbenzyl)salicylaldimine, 2-HOC 6 H 4 CH=NCHMePh]. Complex 1, C 25 H 30 NO 6 ClRu, crystallizes in the noncentric triclinic space group P1 with a=9.885(1)A, b=10.185(1)A, c=14.187(2)A, α=110.32(1)°, β=102.17(1)°, A=102.41(1)°, V=1243( 1) A 3 , and Z=2. The X-ray structure shows the presence of two diastereomers in a 1:l ratio having R Ruν S C and S Ruν S C configurations. The Ru-OH 2 bond distances are considerably long, and the values for R Ru -1 and S Ru -1isomers are 2.119(5) and 2.203(5) A, respectively. The aqua complex (1) exists as a single diastereomer in solution, and it forms stable adducts with P-, N-, and halide-donor ligands. The stereochemical changes associated with adduct-forming reactions follow an inversion order: PPh 3 »P(OMe) 3 > pyridine bases»halides (I, Br, Cl)>H 2 O.
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