What are Inner and Outer Orbital Complexes??
Inner-orbital or low-spin or spin-paired complexes: Complexes that use inner d-orbitals in hybridisation; for example, [Co(NH3)6]3+. The hybridisation scheme is shown in the following diagram.
Outer-orbital or high-spin or spin-free complexes: Complexes that use outer d-orbitals in hybridisation; for example, [CoF6]3−. The hybridisation scheme is shown in the following diagram.
thus forming a sp3d2 hybridisation of the resultant complex
As ammonia is a strong field agent than it will bound all the unpaired electrons into paired electrons hence empty orbitls will be formed in which NH3 releases its electrons hence it will act as a inner orbita complex
2. These ligands then are called 'Strong Field Ligands'.
3. They form low spin complexes.
4. Examples- CN- , CO, NH3
1. Similarly, ligands (having greater electronegetivty) which do not have the tendency to push away the electrons into inner orbitals due to electron withdrawing tendency form 'Outer' orbital complexes
2. These are called ' Weak Field Ligands ' .
3. They form 'High spin complexes'.
4. Examples- F- , Cl- , Br- , H2O.
Hope this helps you,
The inner and outer orbital complexes are basically the other term used for high and low spin complexes.
Inner Orbital Complexes :- These are the compounds that first of all prefers to fill the D-Orbital that is the ligands at first fills up the D-Orbital and then the s and p orbitals.
The hybradization of such compounds therefore is d2sp3 (D-Orbital filled at first).
They are known as low spin complexes.
Outer Orbital Complexes :- These are the compounds that prefers to fill the D-Orbital at last (after s and p orbital) that is the ligands at first fills up the 's' and 'p' Orbital and then the D-Orbitals.
The hybradization of such compounds therefore is sp3d2 (D-Orbital filled at last).
They are known as high spin complexes.
Inner and outer orbital complexes is that the hybridisation of the atomic orbitals of the central metal atom of inner orbital complexes involves inner sell d orbital whereas the hybridisation of the atomic orbitals of the central metal atom of outer orbital complexes involves outermost sell d...
When the (n-1)d orbitals participate in the bonding , this is usually formed by the octahedral complexes having strong field ligand.
Outer orbital complexes:
The (n-1)d orbitals does not participate in the bonding , occurs in octahedral complexes having weak field ligand.