How are the color of an compound and it's constituent elements related?

3
0
Suppose the color of some elements is red and blue but after the reaction between them a new compound formed with yellow color .so on what factor does the the color of compound depend???
I think it may depend depend upon the number of electron transferred and the remaining one...
 
143
36
It depends on the energy difference between molecular orbitals. When a photon hits electron density, an electron can transition to a higher energy orbital. The photon disappears.

Compounds that absorb light in the visible spectrum will have a colour. The colour will be whatever you get when you take the whole spectrum and remove the absorbed part of the spectrum.

When molecular orbitals change as the molecule rearranges its electrons as new bonds are formed, so change the energy difference between the highest occupied molecular orbital(HOMO) and the lowest unoccupied molecular orbital (LUMO). Hence, they have a different spectrum.

Only certain compounds have HOMO to LUMO transitions with energy that corresponds to the visible spectrum. So only these certain molecules have colour.
 

Want to reply to this thread?

"How are the color of an compound and it's constituent elements related?" You must log in or register to reply here.

Related Threads for: How are the color of an compound and it's constituent elements related?

Replies
3
Views
1K
Replies
4
Views
775
  • Posted
Replies
5
Views
15K
  • Posted
Replies
8
Views
4K
  • Posted
Replies
5
Views
23K
  • Posted
Replies
2
Views
3K
  • Posted
Replies
3
Views
4K
  • Posted
Replies
4
Views
7K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top