Question

Coordination Compound Naming!

I have 6 compounds to name. I named all 6, but please check my answer and if wrong, please explain why and how to do it. Thank you so much!

1. [Pt(NH₃)₄Cl₂]SO₄  - tetraamminedichloroplatinum (IV) sulfate

2. K₃[Mo(CN)₆F₂] - potassium hexacyanodifluoromolybdenate (V)

3. K[Co(EDTA)] - potassium ethylenediaminetetraacetate cobaltate(III) Note: For the cobalt oxidations state, I calculated it to be +3 because EDTA has a charge of -4 and and K is +1. So, it needs to be +3 to neutral. However, my friends got +1 and I do not quite understand why and who is correct.

4_. Co(NH₃)₃(NO₂)₃ - triamminetrinotrocobalt (III)

5. [Fe(en)₃][IrCl₆] - tris(ethylenediamine)iron (0) hexachloroiridiate (VI) Note: as you can see this is the one I need help with. I thought both complexes had to be neutral and since en is 0, Fe is 0. Cl is 6(-1) making Ir +6. But when it comes to naming Fe in a cation complex, is it just written as iron? In anionic form, I know it has to be ferrate.

6. Ca₃[Ag(S₂O₄)₂]₂ - calcium bis(dithionate)aurate (I) Note: since dithionate is an anion in this complex, would the name change to dithionato?

Thank you so much!

Answer 1

1. [Pt(NH₃)₄Cl₂]SO₄  - tetraamminedichloroplatinum (IV) sulfate ........ correct

2 . K₃[Mo(CN)₆F₂] - potassium hexacyanodifluoromolybdenate (V)......correct

3
K[Co(EDTA)]  
potassium monoethylenediaminetetraacetocobaltate (III) ......correct

4_. Co(NH₃)₃(NO₂)₃ - triamminetrinotrocobalt (III).......correct

5   [Fe(en)₃][IrCl₆] - tris(ethylenediamine)iron (0) hexachloroiridiate (VI)....correct

6   Ca₃[Ag(S₂O₄)₂]₂   Sodium bisthiosulphatoagentate