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en and edta

Posted: Sun Dec 08, 2019 10:48 am
by Andrea_1H
For en and EDTA are we only supposed to know that en is bidentate and EDTA is hexadentate?

Re: en and edta

Posted: Sun Dec 08, 2019 10:50 am
by Kendall 3H
yes, I think so.
For en I think we should also know the formula which is NH2CH2CH2NH2

Re: en and edta

Posted: Sun Dec 08, 2019 10:51 am
by 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.

Re: en and edta

Posted: Sun Dec 08, 2019 4:56 pm
by Natalie Benitez 1E
For en and edta are expected to know the chemical formula in its entirety?

Re: en and edta

Posted: Sun Dec 08, 2019 4:59 pm
by 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.

Re: en and edta

Posted: Sun Dec 08, 2019 9:34 pm
by 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.

Re: en and edta

Posted: Wed Dec 02, 2020 9:11 am
by 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