H2O and Carbonate

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305421980
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

H2O and Carbonate

Postby 305421980 » Sat Dec 07, 2019 1:32 pm

Why can't water and carbonate be polydentates?

Eugene Chung 3F
Posts: 142
Joined: Wed Nov 15, 2017 3:03 am

Re: H2O and Carbonate

Postby Eugene Chung 3F » Sat Dec 07, 2019 7:58 pm

1. Water can't act as a polydentate because it is too small to form multiple bonds to a transition metal central atom. The lone pairs are both on the same O atom.
2. Carbonate can act as both mono and bidentate. Since it has two O atoms with - charge (lone pairs), it can interact in two places. It depends on the size of the cation.

pauline young 1L
Posts: 50
Joined: Thu Jul 11, 2019 12:15 am

Re: H2O and Carbonate

Postby pauline young 1L » Sat Dec 07, 2019 8:02 pm

adding onto this reply for water, even though there are two lone pairs, both are on the O. Since the lone pairs are on the same atom, it doesn't matter that there are two lone pairs, its still only monodentate

RichBollini4G
Posts: 100
Joined: Wed Sep 18, 2019 12:18 am

Re: H2O and Carbonate

Postby RichBollini4G » Sat Dec 07, 2019 9:40 pm

Eugene Chung 3F wrote:1. Water can't act as a polydentate because it is too small to form multiple bonds to a transition metal central atom. The lone pairs are both on the same O atom.
2. Carbonate can act as both mono and bidentate. Since it has two O atoms with - charge (lone pairs), it can interact in two places. It depends on the size of the cation.

very helpful, thank you!


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