ethylenediaminetetraacetato (edta)

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Noah Carey 1G
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ethylenediaminetetraacetato (edta)

Postby Noah Carey 1G » Fri Jun 08, 2018 7:26 pm

Why is ethylenediaminetetraacetato (edta) not octadentate? There are two additional Oxygen atoms that have double bonds and therefore two lone pairs each. These pairs do not interact with the metal. Is it because the shape can't reach those two Oxygen atoms? Oxygen atoms with a formal charge of 0 can share the lone pairs in a coordination complex too, right?

jadam_1E
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Re: ethylenediaminetetraacetato (edta)

Postby jadam_1E » Sun Jun 10, 2018 3:48 pm

Hi Noah,

A double bond is made of a sigma bond and a pi bond. Because of the pi bond, any atom with a double bond cannot rotate or bend--it is fixed so to say. This inability of the atom to reach toward the central metal atom prevents it from binding. So, the two oxygens in EDTA that have double bonds do not contribute to the total number of donor atoms and EDTA is hexadentate.

Chem_Mod
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Re: ethylenediaminetetraacetato (edta)

Postby Chem_Mod » Sun Jun 10, 2018 6:13 pm

Yes. the two additional oxygen atom is geometrically constrained to form coordinate to the metal.

Anthony Mercado 1K
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Re: ethylenediaminetetraacetato (edta)

Postby Anthony Mercado 1K » Sun Jun 10, 2018 8:47 pm

What is the critical importance of edta? *I have been hearing this term a lot recently, and I was wondering if someone could explain the composition of edta, and the properties it has

jadam_1E
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Joined: Fri Apr 06, 2018 11:01 am

Re: ethylenediaminetetraacetato (edta)

Postby jadam_1E » Sun Jun 10, 2018 9:24 pm

edta is very important for one thing because it is the most common hexadentate ligand, meaning it can bind to a central metal atom in up to 6 locations.

Chem_Mod
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Re: ethylenediaminetetraacetato (edta)

Postby Chem_Mod » Sun Jun 10, 2018 9:53 pm

edta binds to almost all heavy metals. So it has uses in experiments and applications where metal ions are not desired.

nikitasridhar_1b
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Re: ethylenediaminetetraacetato (edta)

Postby nikitasridhar_1b » Wed Jun 13, 2018 1:03 am

do we need to memorize the formula for edta?


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