Can ammonia complex with copper or chromium?
Yes. Ammonia acts as a nice, strong-field ligand for the metal-ligand complexation reaction with Cu(I), Cu(II), and Cr(III).
http://www.ncbi.nlm.nih.gov/pubmed/20030372 (Cu(I) and Cu(II) complexes)
http://alpha.chem.umb.edu/chemistry/ch371/documents/Labreportexample.pdf (hexamminechromium(III) nitrate)
Cu(I) is a transition metal that forms a
Because ammonia is a strong-field ligand, it more than likely causes a low spin state. All that means is that ammonia feels high metal-ligand repulsions with the transition metal, increasing the energy gap between the higher and lower energy d orbitals. The higher the gap, the more likely it is in a low-spin state, and vice versa.
The d-orbitals split into 2
Cr(III) forms a