chelate

[Sophia Dinh 1D]

What is a chelate/chelating ligand?

[Nare Arakelian Dis 3E]

Does it involve ligands that are polydentates? and is cisplatin a chelate?

[Sophia Shaka 3L]

A chelating ligand is one that has the bonding motif below that Dr. Lavelle mentioned in class, in order to form multiple bonds to a transition metal cation. This structure is needed in order for the bonds to be physically close enough on the molecule to both/all reach the cation and bond to it. You can tell based on the structure whether a ligand will be a chelating ligand, because it must be polydentate and be an isomer with the right structure in order to chelate.
Here is the bonding motif:
atom with lone pair-spacer atom-spacer atom-atom with lone pair
These atoms with the lone pair(s) will create bonds with the TM cation.

[Jamie Lee 1F]

A chelate is a complex that has one or more ligands bonded to it that forms a ring around the central metal atom.

[Aprice_1J]

How can you tell what is able to form a chelating complex? For example, in 9C.7, how does the different structure of diaminobenzene change the ability to form a chelating complex?

[905416023]

This is how I remember it, if the molecule looks like there is a ring on it, it is a chelate. What I mean by ring, is a string of atoms starting at the central atom, connecting to one another in a string type formation, and reconnecting to the central atom.