January 15, 2025, 11:17:22 AM
Forum Rules: Read This Before Posting


Topic: How to name Coordination compounds  (Read 2720 times)

0 Members and 3 Guests are viewing this topic.

Offline earthnation112

  • Regular Member
  • ***
  • Posts: 94
  • Mole Snacks: +2/-0
How to name Coordination compounds
« on: November 12, 2016, 09:08:29 PM »
Hi, been just going through my notes regarding how to name coordination compounds and had a question.

If I was given a name such as "diamminedichloro(ethylenediamine)cobalt(III) bromide" and I was asked to convert it to its chemical formula which is: [CoCl2(en)(NH3)2].Br, how do I know that the ethylene (en) comes after the dichloro (Cl2) in the chemical formula and its not the other way around? Thanks

Update:

Just read this: "Whatever is inside the square brackets is directly bonded to the metal, i.e. a ligand. Whatever is outside the bracket is either a counterion or a molecule that crystallises with the complex (like water of crystallisation), but is not bonded to it."

So does this mean that the following two are the same:
[CoCl2(en)(NH3)2].Br
[Co(en)Cl2(NH3)2].Br
« Last Edit: November 12, 2016, 09:34:40 PM by earthnation112 »

Offline AWK

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7976
  • Mole Snacks: +555/-93
  • Gender: Male
AWK

Offline earthnation112

  • Regular Member
  • ***
  • Posts: 94
  • Mole Snacks: +2/-0
Re: How to name Coordination compounds
« Reply #2 on: November 13, 2016, 12:18:29 PM »
http://chem.libretexts.org/Core/Inorganic_Chemistry/Coordination_Chemistry/Basics_of_Coordination_Chemistry/Nomenclature_of_Coordination_Complexes
http://www.chemistry.wustl.edu/~edudev/LabTutorials/naming_coord_comp.html
Read the whole procedure of naming, not only its part.

I have read both links and I understand you first place the anionic ligand name followed by neutral ligands, but why is it in the case of the following you don't:

[Ru(NH3)2(en)ClF]
Diamminechloro(ethylenediamine)fluororuthenium (II)

Shouldn't it be, [RuClF(NH3)2(en)]
 

Offline AWK

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7976
  • Mole Snacks: +555/-93
  • Gender: Male
Re: How to name Coordination compounds
« Reply #3 on: November 13, 2016, 03:57:39 PM »

[Ru(NH3)2(en)ClF]
Diamminechloro(ethylenediamine)fluororuthenium (II)
There is no such example in my links.

Such sequence of neutral and anionic ligands probably indicates two errors - wrong position of right square bracket and  transposition of neutral ligands.
AWK

Offline earthnation112

  • Regular Member
  • ***
  • Posts: 94
  • Mole Snacks: +2/-0
Re: How to name Coordination compounds
« Reply #4 on: November 15, 2016, 04:41:48 PM »
Thank you for the websites, as for the example I used it was in my notes and was a mistake made my a lecturer. Cheers

Sponsored Links