Why is Cu2[Fe(CN)6] chocolate brown, and [Fe(H2O)5NO]2+ the rust brown? Both have the same central metal ion, right?

Question

anonymous · Answer

What is the central metal ion in each?

anonymous · Answer

Fe2+

anonymous · Answer

(don't forget the charge on the [Fe(H2O)5NO] :-) )

anonymous · Answer

So what is different about the two complexes?

anonymous · Answer

I'm signing off, so real quick:
The ligands in each compound are different, which leads to different color changes due to different energy levels in the complex bonds. That's a very, very broad answer, so maybe someone else can fill you in :-) Good luck

anonymous · Answer

Oh yes, I understood. So, you're saying that the CFSE is different for both the complexes and that causes the difference in colour due to excitation of an electron?

anonymous · Answer

:-) yes, more exactly! bye