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You can determine the coordination number by counting the number of bonds connected to the metal central atom (the ligands inside the brackets). In this case the coordination number of this molecule would be 6 because there are four ammine ligands and 2 Bromines in the brackets which means the ligands are in the coordination sphere so you would count them in your coordination number. If we were given [Cu(NH3)4] F2 then your coordination number would just be 4 as the fluorines are outside the coordination sphere. I hope this helps!!
Hi! I agree with the above post. I also think it's important to keep in mind the denticity of the ligands in the coordination complex. For example, if one of the ligands is bidentate, then it could form 2 coordinate covalent bonds with the central atom (it would count as 2 instead of 1 towards the coordination number). Hope this helps!
A simple way to think of the definition of Coordination Numbers is the number of bonds that are attached to the central transition metal cation. In your example, the coordination number is 6 because there are 6 covalent bonds with the central metal cation (4 from NH3 and 2 from Br). In this example, there are also 6 ligands but keep in mind that the coordination number does not always equal the number of ligates as some ligates are polydentate (form multiple bonds to central metal cation).
Ashley Ko 2K wrote:Hi! I agree with the above post. I also think it's important to keep in mind the denticity of the ligands in the coordination complex. For example, if one of the ligands is bidentate, then it could form 2 coordinate covalent bonds with the central atom (it would count as 2 instead of 1 towards the coordination number). Hope this helps!
If there is a bidentate ligand does that mean the whole ligand is bidentate? Or can their be a bidentate bond on one side and a monodentate bond on the other? I'm not sure how naming would work if that was even the case though.
Coordination number is the number of bonds but you must keep in mind that some ligands are bidentate/tridentate/tetradentate ect and would contribute 2 or more bonds. These additional bonds must be taken into account to find the correct coordination number.
The coordination number is the number of atoms/molecules bonded to a transitional metal. Anything inside of the bracket is part of the coordination sphere and connected to transition metal central atom. There are 4 NH3 molecules and 2 Br atoms attached to the transition metal, so the coordination number would equal 6 because there are 6 things bonded to the transition metal
you can determine the coordination compound by adding up all the bonds that the ligands can form with the TM. Usually, when I am finding the coordination compound, I will always identify how many bonding sites each ligand has and then note how many of each ligand there is. So in your example, I would note how NH3 is monodentate and there are 4 of those ligands, as well as two Br ligands which is monodentate. After adding everything up, you get a coordination number of 6.
In order to find the coordination number simply count the number bonds between the TM and ligands. OFten this will be one bond per one ligand as most coordination compounds we will see involve monodentate ligands. However, some ligands such as chelates can have multiple bonds per ligand, so make sure to always check how many bonds a ligand has rather than simply counting the number of ligands!
The coordination number is a value representing the number of atoms, molecules, or ions that are held by a central transition metal atom. It is important to note that denticity can vary and you count only the number of atoms inside brackets held by the transition metal!
Coordination number is the number of bonds that the transition metal forms with its ligands (within the coordination sphere). In the example you provided, the coordination number would be 6 because 4 NH3 and 2 Br are attached to a single metal.
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