Ligands

Moderators: Chem_Mod, Chem_Admin

Alex Hitti 3E
Posts: 51
Joined: Sat Aug 17, 2019 12:17 am

Ligands

Postby Alex Hitti 3E » Sun Nov 24, 2019 8:38 pm

How do you find the oxidation state of transition metals in a coordination compound?

Clarice Chui 2C
Posts: 101
Joined: Fri Aug 30, 2019 12:16 am

Re: Ligands

Postby Clarice Chui 2C » Sun Nov 24, 2019 8:38 pm

In order to find the oxidation state of a transition metal, find the charges of the atoms around the central atom. Whatever those charges add up to, subtract that from the formal charge of the molecule as a whole. So for example if the formal charge of the molecule was neutral and the surrounding atoms’ charges added up to -2, then you know the oxidation state of the transition metal must be +2.

NRobbins_1K
Posts: 54
Joined: Sat Aug 17, 2019 12:15 am

Re: Ligands

Postby NRobbins_1K » Sun Nov 24, 2019 8:38 pm

First, look at the overall charge of the compound. Whatever it is, the negative charges of the ions and the positive charges of the transition metal must add to that overall charge. If the overall molecule is neutral, but there are two ligands with a charge of -1 each, then the oxidation state of the transition metal must be +2 so that the total -2 charge of the ligands are cancelled out.

KarineKim2L
Posts: 100
Joined: Fri Aug 30, 2019 12:16 am

Re: Ligands

Postby KarineKim2L » Sun Nov 24, 2019 8:42 pm

The ligands have a set charge, as do the ions. So for example, for [Co(NH3)5Cl]Cl (There are 5 NH3s), then you know that the oxidation number of Cobalt is 2+. NH3 is always neutral, and the total charge for the coordination compound should be +1 because the charge of Cl is -1. +2 of Cobalt minus 1 for the Cl results in +1 charge for the whole coordination compound.

Alison Trinh 1E
Posts: 104
Joined: Thu Jul 25, 2019 12:16 am

Re: Ligands

Postby Alison Trinh 1E » Sun Nov 24, 2019 11:31 pm

Can someone explain what exactly a ligand is?

Sean Cheah 1E
Posts: 105
Joined: Wed Sep 18, 2019 12:20 am

Re: Ligands

Postby Sean Cheah 1E » Mon Nov 25, 2019 12:18 pm

Alison Trinh 1A wrote:Can someone explain what exactly a ligand is?

In this context, a ligand refers to an electron-pair donor that forms one or more coordinate covalent bonds with a central metal ion.


Return to “Properties & Structures of Inorganic & Organic Acids”

Who is online

Users browsing this forum: No registered users and 1 guest