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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: Winga on November 14, 2005, 01:45:08 PM

Title: d-d transition, solvent as ligand
Post by: Winga on November 14, 2005, 01:45:08 PM
e.g. a square planar complex

For dxz,dyz ---> dz2 transition, if there is no electron in dz2 orbital of metal centre, when a solvent molecule acts as a ligand to attach the metal centre at z-axis, then, the dz2 is stablized or destabilized?
Title: Re:d-d transition, solvent as ligand
Post by: skyaintsnow on November 15, 2005, 01:35:01 PM
I'd put destablized. dz2, its spatial arrangement causes repulsion with ligand electrons

Hey wait, square planar, how come d2 is involved?
Title: Re:d-d transition, solvent as ligand
Post by: Winga on November 15, 2005, 02:50:49 PM
If there is no electron in dz2, how comes the electron-electron repulsion with ligand's lone pair.

You mean the empty dz2 orbital repels ligand's lone pair?
Title: Re:d-d transition, solvent as ligand
Post by: skyaintsnow on November 15, 2005, 03:14:30 PM
sorry, I was talking about octahedral. I reconsidered it, maybe only dx2-y2 has repulsion. After splitting all other orbitals are stablized.
Title: Re:d-d transition, solvent as ligand
Post by: Winga on November 16, 2005, 04:55:42 AM
I just wonder that there is destabilization of filled dz2 orbital when a ligand attaches to the metal centre at z-axis, while there is stabilization of unfilled dz2 orbital when a ligand attaches to the metal centre at z-axis.
Title: Re:d-d transition, solvent as ligand
Post by: Winga on December 02, 2005, 06:40:03 AM
Can anyone help?
Title: Re:d-d transition, solvent as ligand
Post by: AgG on December 02, 2005, 01:19:13 PM
the crystal field arises as a result of the inherant geometry of the system whether or not the orbitals are filled.  The crystal field splitting diagram for a five coordinate square pyramidal complex looks similar to square coordinate complexes but the energy of the z2 orbital is higher than it is in the square planar complex as a result of interaction with the new ligand.