order of ligand names  [ENDORSED]

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Emmy Son 4f
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Joined: Mon Jan 26, 2015 2:17 pm

order of ligand names

Postby Emmy Son 4f » Sat Jul 23, 2016 11:42 pm

How is the order of each ligand name determined? ex. [Co(Nh3)5Cl]Cl penta aminne chloro cobalt (2) Why do we start with naming the center first?

Roya_N
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Joined: Fri Jun 17, 2016 11:28 am

Re: order of ligand names  [ENDORSED]

Postby Roya_N » Sun Jul 24, 2016 3:15 pm

The ligands are named first in alphabetic order then the metal is named followed by the oxidation state.


Hope this helps in some way!

Sara Juarez 1B
Posts: 8
Joined: Tue Nov 24, 2015 3:00 am

Re: order of ligand names

Postby Sara Juarez 1B » Sun Jul 24, 2016 11:34 pm

When working from name to the formula of a molecule, does the order matter? I know that if we are given the formula and then we are asked for the name we are require to write it in alphabetical order but how does it work if we are given the name first and we are trying to figure out the formula for the molecule?

Chem_Mod
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Re: order of ligand names

Postby Chem_Mod » Tue Jul 26, 2016 11:17 pm

You do not need to write the formula in any order, but you do need to order the atoms of the ligand in a way that the atom of the ligand which coordinates to the metal is listed first. There is a big difference between (NC) and (CN) ligands.

HannahLewis
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Joined: Wed Nov 18, 2015 3:00 am

Re: order of ligand names

Postby HannahLewis » Wed Jul 27, 2016 3:57 am

What is the difference between (NC) and (CN) ligands then?

Kevin Tam 1J
Posts: 23
Joined: Wed Sep 21, 2016 2:59 pm

Re: order of ligand names

Postby Kevin Tam 1J » Mon Nov 07, 2016 8:15 am

The NC ligand suggests that the nitrogen (N) is bonded to the central cation. However, the CN ligand suggests that the carbon (C) is bonded to the central cation.

Sydney Wu 2M
Posts: 50
Joined: Fri Jul 22, 2016 3:00 am

Re: order of ligand names

Postby Sydney Wu 2M » Mon Nov 07, 2016 10:24 am

I notice that when water is a ligand (looking at #31), the SSM writes its formula as H2O for one exercise and OH2 for another one. I know the order of the atoms matter, so which one is correct? Why?

Kevin Tam 1J
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Joined: Wed Sep 21, 2016 2:59 pm

Re: order of ligand names

Postby Kevin Tam 1J » Mon Nov 14, 2016 8:56 am

I think that for H2O, it is already implied/understood that the oxygen (not the hydrogen) is bonded to the central cation, so writing it either way (as H2O or OH2) is fine, although I think it is better to write it as OH2. In other words, there is only one possible way for the water to bond to the central cation.

However, for something like CN, there are two possibilities: CN (cyano) and NC (isocyano). CN( cyano) implies that the carbon atom is bonded to the central ation whereas NC (isocyano) implies that the nitrogen is bonded to the central cation.


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