## Homework Problem 16.31 Part B

Griffin Schneider 1I
Posts: 5
Joined: Fri Sep 26, 2014 2:02 pm

### Homework Problem 16.31 Part B

This question asks if carbonate is a polydentate and if so, at how many locations can it bind simultaneously to a single metal center.

The answer is 1 or 2 locations. Why? There are 3 oxygen atoms capable of donating electrons but doesn't there need to be a larger gap between them in order for 2 to bond at the same time?

Regina Chi 2K
Posts: 51
Joined: Fri Sep 26, 2014 2:02 pm

### Re: Homework Problem 16.31 Part B

If you look at the Lewis structure of carbonate, you will notice that it demonstrates a resonance structure where one oxygen is double-bonded and the other two are single-bonded to the carbon. Each of these single-bonded oxygens can attach to a metal, making it either monodentate or possibly bidentate! The double-bonded oxygen doesn't have a lone electron pair at the end and cannot bond to the a metal (rule of thumb). They could bind to different metals...