Coordination Number

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Benjamin_Hugh_3F
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Coordination Number

Postby Benjamin_Hugh_3F » Thu Dec 03, 2020 6:35 am

Just to clarify, the coordination number is basically equal to the number of ligands attached to the central atom, not the total number of ligands right?

Jessie Hsu 1C
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Joined: Wed Sep 30, 2020 9:49 pm

Re: Coordination Number

Postby Jessie Hsu 1C » Thu Dec 03, 2020 7:25 am

I think of the coordination number as the number of bonds from the ligands to the metal! For example in [Ni(NH3)4Cl2] the 6 ligands connect to the Ni with 6 bonds so the coordination number is 6.

Cooper_Geralds_3B
Posts: 102
Joined: Wed Sep 30, 2020 10:07 pm

Re: Coordination Number

Postby Cooper_Geralds_3B » Thu Dec 03, 2020 9:34 am

Hi, here is a helpful definition that I found on coordination numbers: "Coordination number, also called Ligancy, the number of atoms, ions, or molecules that a central atom or ion holds as its nearest neighbors in a complex or coordination compound or in a crystal" (Britannica). Hope this helps!

Eunice_Castro_1G
Posts: 91
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Re: Coordination Number

Postby Eunice_Castro_1G » Thu Dec 03, 2020 10:56 am

Hi! Coordination number is the number of bonds that central atom has. Hope this helps!

Crystal Pan 2G
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Re: Coordination Number

Postby Crystal Pan 2G » Thu Dec 03, 2020 12:27 pm

coordination number is the number of ligands attached to the transition metal, essentially the atoms inside the square brackets.

Jason Knight - 1F
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Re: Coordination Number

Postby Jason Knight - 1F » Thu Dec 03, 2020 1:55 pm

Coordination number is the number of atoms or molecules that is currently surrounded by a central atom. For example the coordination number of [M(NH3)4 F2] is 6 because there are 6 bonded regions to the central atom (M).

VincentLe_3A
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Re: Coordination Number

Postby VincentLe_3A » Thu Dec 03, 2020 3:04 pm

Coordination number is the number of bonds on the transition metal cation within the coordination compound. It is important to note that a single ligand can contribute to more than one coordination number if it is polydentate. For instance, a bidentate ligand, such as ethylenediamine, would be able to form a ring like structure and have two bonds with the transition metal cation. Therefore, a bidentate ligand would contribute 2 to the overall coordination number as it forms 2 bonds.

MCalcagnie_ 1D
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Joined: Wed Sep 30, 2020 10:08 pm

Re: Coordination Number

Postby MCalcagnie_ 1D » Thu Dec 03, 2020 6:40 pm

I have found a pattern in simply looking at the subscripts of the ligands and adding those up and using that as the coordination number. I don't know if this is an effective method or not, or if it's already widely used, but just thought I would throw it out there in case it helped someone!

Emma Strassner 1J
Posts: 92
Joined: Wed Sep 30, 2020 9:50 pm

Re: Coordination Number

Postby Emma Strassner 1J » Thu Dec 03, 2020 8:05 pm

Hi, coordination number is the number of ligands attached to the transition metal. It is easiest to look at the number of ligands inside the brackets.


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