Two 2,5-Dihydroxy-1,4-benzoquinonate-O,O'-Containing Mononuclear Complexes: [Cu(C₆H₂O₄)(C₈H₆N₄)(H₂O)].5H₂O and [Ni(C₆H₂O₄)(C₁₂H₁₂N₂)₂].H₂O (C₈H₆N₄ = 2,2'-Bipyrimidine, C₁₂H₁₂N₂ = 4,4'-Dimethyl-2,2'-bipyridine)

The crystal structures of aqua(2,2'-bipyrimidine-N,N')(4,5-dihydroxy-1,2-benzoquinonato-O,O')copper(II) pentahydrate, [Cu(C₆H₂O₄)(C₈H₆N₄)(H₂O)].5H₂O, containing five-coordinated copper(II) with slightly distorted square-pyramidal geometry and of bis(4,4'- dimethyl-2,2'-bipyridine-N,N')(4,5-dihydroxy-1,2-benzoquinonato-O,O')nickel(II) monohydrate, [Ni(C₆H₂O₄)(C₁₂H₁₂N₂)₂].H₂O, comprising six-coordinate nickel(II) with distorted octahedral geometry, are reported. In both complexes, the dianion of 2,5-dihydroxy-1,4-benzoquinone occurs in the bidentate o-benzoquinone form which chelates through the 1, 2 O atoms.

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