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DMG vs 8-Hydroxyquinoline

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AhmedEzatAlzawalaty:
Why 8-hydroxy quinoline [benzo(2,3-b)azine] is bidentate ligand?(my answer : this is due to the N and -OH ) and DMG is bidentate due to N and N, shouldnt DMG be Tetradentate ligand as it contains also two OH groups.(as OH is considered to have lone pair)
do u get it?

AWK:
8-hydroxyquinoline complexes throuhh N and O-
DMG complexes through O- and nonbonded electron pair of the second oxygen atom.

AhmedEzatAlzawalaty:
u answer the wrong question.i say either why the two N in DMG not share in complexing?

AWK:
DMG structure is different from that you drew

AhmedEzatAlzawalaty:
ok i draw it wrong,here it is
but the question stills the same.

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