Naming -ate

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Michelle Dong 1F
Posts: 110
Joined: Fri Sep 29, 2017 7:04 am

Naming -ate

Postby Michelle Dong 1F » Mon Nov 27, 2017 5:12 pm

I know that we add "-ate" to the end of a metal name if the complex has a negative charge (eg: [Ni(CN)4]2- is ...nickelate (II)), but why is it that in some cases, we still use "-ate" even though the complex does not have an overall negative charge? An example would be K3[CoF6], which is named Potassium hexa-fluorido cobaltate (III).

Ryan Sydney Beyer 2B
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Joined: Fri Sep 29, 2017 7:07 am
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Re: Naming -ate

Postby Ryan Sydney Beyer 2B » Mon Nov 27, 2017 5:19 pm

Sometimes we use the "ate" suffix to differentiate between whether it is a cation or an anion. In this specific situation, the coordination sphere has an overall negative charge and therefore we should be indicating that this is an anion.

Jessica Yang 1J
Posts: 55
Joined: Fri Sep 29, 2017 7:03 am

Re: Naming -ate

Postby Jessica Yang 1J » Mon Nov 27, 2017 5:20 pm

The complex, which doesn't include the potassium is still negative. The 6 F's create a -6 charge and the Co creates a +3 charge, resulting in an overall -3 charge for the complex. The entire coordination compound, which includes the potassium, is of neutral charge.

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