A novel ruthenium(0) aqua complex, Ru(dimethyl fumarate) 2 (dppe)(H 2 O) ( 4 ), was synthesized via the reaction of Ru(η 6 -1,3,5-cyclooctatriene)(dimethyl fumarate) 2 ( 3 ) with dppe in 1,2-dichloroethane/water, which is a quite rare example of a stable and isolable ruthenium(0) aqua complex. The X-ray crystallography of 4 indicated that coordination of a water molecule to the ruthenium center was stabilized by two hydrogen bonds with the carbonyl oxygen atoms of dimethyl fumarate ligands.
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Shiotsuki et al. (2002) studied this question.
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