Question

What spin do the inner orbital complexes have?

Answer 1

Inner orbital complexes:

• "The coordination complexes in which the central metal atom undergoes hybridisation by using $d$-orbitals of the inner shell and $s\mathit{,}\mathit{}p$-orbitals of the outer shells are called inner orbital complexes."
• For example, ${\left[\mathrm{Cu}\right({\mathrm{NH}}_3\left)\right]}^{3+}$ complex is an inner orbital complex that takes into account its inner orbitals having hybridisation $d^{2}s{p}^3$.

Spin of inner orbital complexes:

• In inner orbital complexes, pairing occurs due to hybridisation.
• Due to pairing, there are a lesser number of unpaired electrons or no unpaired electrons in these complexes.
• The higher energy orbitals are usually empty.
• Thus, inner orbital complexes have low spin.