Oxolate Chelate

[Jasmine 2C]

Is oxolate (C204)2- considered bidenate because two of the oxygens at the ends have single sigma bonds (so they can rotate and bind to more sites) while the other two oxygens have pi bonds (so they can't rotate and donate their electron pairs)?

[Myka G 1l]

Oxalate is bidentate because only two of the oxygens have a minus 1 charge that they use to form a bond with the central metal atom. The other two oxygens form a double bond with the carbon so they have a neutral formal charge.

[Angela Patel 2J]

are chelates only bidentate?

[KnarGeghamyan1B]

Chelates are polydentates so 2 or more bonding sites.

[Nuoya Jiang]

No, chelates can form at least BIdentate.

[Claire Stoecklein 1E]

Are polydentates with three bonding sites called tridentate? Or do we only specify bidentate?

[Jasmine 2C]

Oxalate is bidentate because only two of the oxygens have a minus 1 charge that they use to form a bond with the central metal atom. The other two oxygens form a double bond with the carbon so they have a neutral formal charge.

Does it matter if they have a negative bond or not? For molecules like ethylenediamine, the nitrogens that allow it to be bidentate have a neutral formal charge.