Solution check for Complex Molecule IUPAC Naming

In summary: Since you don't know which it is, it's proper to use the anion name hexanitritocobaltate(III).In summary, the IUPAC names for the given chemical formulas are hexaamminenickel(II), triamminetrichlorochromium(III), and hexanitritocobaltate(III). The metal oxidation states are +2, +3, and +3 respectively, and the coordination numbers are all 6. The donor atoms for each complex are ammonia for nickel, ammonia for chromium, and either nitrogen or oxygen for cobalt.
  • #1
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Homework Statement


a) Given the IUPAC name to the chemical formulas: [tex]{\left[ {Ni{{\left( {N{H_3}} \right)}_6}} \right]^{2 + }}[/tex] [tex]\left[ {CrC{l_3}{{\left( {N{H_3}} \right)}_3}} \right][/tex] [tex]{\left[ {Co{{\left( {N{O_2}} \right)}_6}} \right]^{3 - }}[/tex]

b) Give the metal oxidation state, Coordination number and distinguish the donar atoms for each complex.

2. The attempt at a solution
[tex]{\left[ {Ni{{\left( {N{H_3}} \right)}_6}} \right]^{2 + }}{\rm{ - hexaaminenickate ion}}\left( {II} \right)[/tex] CN - 6, Metal oxidation state - 2+

[tex]\left[ {CrC{l_3}{{\left( {N{H_3}} \right)}_3}} \right]{\rm{ - trisaminetriclorocromate}}\left( {III} \right)[/tex] CN - 6, Metal oxidation state - 3+

[tex]{\left[ {Co{{\left( {N{O_2}} \right)}_6}} \right]^{3 - }}{\rm{ - hexanitrocobalt}}\left( {III} \right){\rm{ ion}}[/tex] CN - 6, Metal oxidation state 3+


are these soluions correct?
many thanks, pavadrin
 
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  • #2
Well, the good news is you got the oxidation states and coordination numbers right.
Compounds that end in -ate are anions. So the only compound that can be an -ate here is the cobalt one. Starting with the nickel compound, the proper name for a NH3 ligand is ammine, with 2 m's. So the name of [Ni(NH3)6]2+ is hexaamminenickel(II). You can add "ion" to that to make it clear that you're not talking about a neutral species.
For the chromium species, you're almost right: triamminetrichlorochromium(III).
For the cobalt, since the overall species is negative, you can write hexanitrocobaltate(III). Sigma also lists it as hexanitritocobaltate(III). See below.

The reason for the two names has to do with the donor atom question. In the case of ammonia, it's pretty clear the ligand binds through the N atom. For the nitro case, there could be linkage isomerism: meaning that the NO2 group could bind through the nitrogen (in which case it's a "nitro" species), or through the oxygen (in which case it's a "nitrito" species).
 

1. What is a complex molecule?

A complex molecule refers to a molecule that consists of a large number of atoms, typically more than 20, and has a complicated structure.

2. Why is IUPAC naming important for complex molecules?

IUPAC naming is important for complex molecules because it provides a systematic and standardized way of naming these molecules, making it easier for scientists to communicate and identify different compounds.

3. How do I check if my solution for complex molecule IUPAC naming is correct?

To check if your solution for complex molecule IUPAC naming is correct, you can follow the general rules and guidelines provided by IUPAC for naming complex molecules. You can also use online tools or consult with other scientists for verification.

4. What are some common mistakes to avoid when naming complex molecules?

Some common mistakes to avoid when naming complex molecules include incorrect placement of prefixes and suffixes, not considering the correct order and position of substituents, and not using proper punctuation and spacing.

5. Are there any exceptions to the IUPAC rules for naming complex molecules?

Yes, there are some exceptions to the IUPAC rules for naming complex molecules. These exceptions are usually temporary and are made to accommodate newly discovered compounds. However, it is important to follow the most current IUPAC guidelines for accurate and consistent naming.

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