Interaction of ruthenium(III) chloride with bis(3,5-dimethylpyrazol-1-yl)methane oxyanions, potential κ3-N,N,O scorpionates
摘要:
When RuCl3 was set to react with both bis(3,5-dimethylpyrazol-1-yl) acetate (bdmpza) and bis(3,5-dimethylpyrazol-1-yl)methane sulfonate (bdmpzsa) new ruthenium(II) complexes were obtained. The reduction of ruthenium(III) was studied by the NMR Evans method and spectrophotometrically, for 1:1 (Ru:L) molar ratios. Using the Evans method pseudo first-order constants of 2.5 x 10(-3) s(-1) (bdmpzsa) and 3.9 x 10(-3) s(-1) (bdmpza) were obtained in DMSO-d(6) (2% t-butanol) solutions. Spectrophotometrically the corresponding constants were also calculated: 1.1 x 10(-3) s(-1) for bdmpzsa, and 1.6 x 10(-3) s(-1), for bdmpza. Both ligands behave as kappa(3)-N,N,O scorpionates but with a weak oxyanionic coordination to the metal, susceptible to be substituted with NEt3 for a 1:1 molar ratio. (C) 2003 Elsevier B.V. All rights reserved.