en and edta

[Andrea_1H]

For en and EDTA are we only supposed to know that en is bidentate and EDTA is hexadentate?

[Kendall 3H]

yes, I think so.
For en I think we should also know the formula which is NH2CH2CH2NH2

[Chris Tai 1B]

I think it would also be good to know why en is bidentate and why edta is hexadentate.
For ethylenediamine (en), the two amine groups on the ends of the molecule can both function as ligands, which means en can create a chelating ligand ring around a transition metal, and is bidentate because it attaches coordinate covalent bonds in two locations.
For ethylenediaminetetraacetate, there are four acetate groups, which have negatively charged oxygen atoms; there also exist two lone pairs on the nitrogens from two amine groups located in the center of the molecule. Hence, edta can bind to a transition metal in 6 different locations.

[Natalie Benitez 1E]

For en and edta are expected to know the chemical formula in its entirety?

[Julianna Laurentano 4G]

Yes, but more specifically I would know what parts of their structures give them these characteristics and how you could identify other bidentates, hexadentates, etc.

[Lauren Lewis3L]

It is important to know that it is a bidentate due to the Nitrogen's ability to bind to other atoms due to their lone pairs. The lone pairs are on separate atoms and not the same Nitrogen atom, but both of them.

[Tiao Tan 3C]

Adding on, there is also a coordination compound called diethylenetriamine (dien) that is on the naming coordination compound sheet: https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf

I memorize this together with en by looking at the number of N in their formulas:
ethylenediamine (en) >- 2N >- NH2CH2CH2NH2
diethylenetriamine (dien)>- 3N >- NH2CH2CH2NHCH2CH2NH2