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New salicylaldimine chelates of divalent and trivalent ruthenium have been synthesized from RuCl2(PPh3)3. The RuII complex trans- Ru(salen)(PPh3)2 is stable in the solid but very unstable to oxidation in solution. The RuIII derivative, Ru(salen)Cl(PPh3), displays magnetic and e.s.r. properties consistent with a low-spin d5 system under a ligand-field of rhombic symmetry.
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Murray et al. (1978) studied this question.
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