en and edta

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en and edta

Postby Andrea_1H » Sun Dec 08, 2019 10:48 am

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

Kendall 3H
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Re: en and edta

Postby Kendall 3H » Sun Dec 08, 2019 10:50 am

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

Chris Tai 1B
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Re: en and edta

Postby Chris Tai 1B » Sun Dec 08, 2019 10:51 am

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
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Re: en and edta

Postby Natalie Benitez 1E » Sun Dec 08, 2019 4:56 pm

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

Julianna Laurentano 4G
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Re: en and edta

Postby Julianna Laurentano 4G » Sun Dec 08, 2019 4:59 pm

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
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Joined: Wed Feb 20, 2019 12:16 am

Re: en and edta

Postby Lauren Lewis3L » Sun Dec 08, 2019 9:34 pm

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
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Re: en and edta

Postby Tiao Tan 3C » Wed Dec 02, 2020 9:11 am

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

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