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ethylenediaminetetraacetato (edta)

Posted: Fri Jun 08, 2018 7:26 pm
by Noah Carey 1G
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?

Re: ethylenediaminetetraacetato (edta)

Posted: Sun Jun 10, 2018 3:48 pm
by jadam_1E
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.

Re: ethylenediaminetetraacetato (edta)

Posted: Sun Jun 10, 2018 6:13 pm
by Chem_Mod
Yes. the two additional oxygen atom is geometrically constrained to form coordinate to the metal.

Re: ethylenediaminetetraacetato (edta)

Posted: Sun Jun 10, 2018 8:47 pm
by Anthony Mercado 1K
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

Re: ethylenediaminetetraacetato (edta)

Posted: Sun Jun 10, 2018 9:24 pm
by jadam_1E
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.

Re: ethylenediaminetetraacetato (edta)

Posted: Sun Jun 10, 2018 9:53 pm
by Chem_Mod
edta binds to almost all heavy metals. So it has uses in experiments and applications where metal ions are not desired.

Re: ethylenediaminetetraacetato (edta)

Posted: Wed Jun 13, 2018 1:03 am
by nikitasridhar_1b
do we need to memorize the formula for edta?