COORDINATION COMPLEX and CRYSTAL FIELD

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Color of Transition Metal Ions in Water Solution

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Presentation transcript:

COORDINATION COMPLEX and CRYSTAL FIELD WEAK FIELD LIGANDS: HALIDES, H2O ETC. ABSORPTION SPECTRA PROVIDES RELATIVELY LITTLE ENERGY FOR EXCITTION TO eg ORBITALS REFLECTION SPECTRA REFLECTS RELATIVELY SHORT WAVES CAUSES CAUSES SMALL ∆o HIGH SPIN: Eg ORBITALS NOT FAR ABOVE T2G ORBITALS, EXCITATION ELECTRONS ARE NOT PROMOTED FAR. CAUSES CAUSES CAUSES ABSORBTION OF LONG WAVES OF VISABLE LIGHT (RED-ORANGE), WHAT YOU DON’T SEE. REFLECTION OF SHORT WAVES OF VISABLE LIGHT (BLUE-VIOLET), WHAT YOU SEE!

COORDINATION COMPLEX and CRYSTAL FIELD STRONG FIELD LIGANDS: en, CN- ETC. ABSORBTION SPECTRA PROVIDES RELATIVELY MUCH ENERGY FOR EXCITTION TO eg ORBITALS REFLECTION SPECTRA REFLECTS RELATIVELY LONG WAVES CAUSES CAUSES LARGE ∆o LOW SPIN: Eg ORBITALS FAR ABOVE T2G ORBITALS, EXCITATION ELECTRONS ARE PROMOTED FAR. CAUSES CAUSES CAUSES ABSORBTION OF SHORT WAVES OF VISABLE LIGHT (BLUE- VIOLET), WHAT YOU DON’T SEE. REFLECTION OF LONG WAVES OF VISABLE LIGHT (RED-ORANGE), WHAT YOU SEE!