What is Jahn teller theorem
Non linear molecule in which electrons can be arranged in more than one way to provide same lowest energy state will be unstable and distort to lower its symmetry and seperate energy states
What is tetragonal distortion (elongation)
.Degeneracy removed by distortion of complex
.. dz2 doubly occupied ligands on z axis sheilded from metal cu2+
.ligands z axis pulled out and x and y pulled in
What is tetragonal distortion (compression)
dx2-y2 doubly occupied ligands on x y-axis shielded from metal cu2+
.ligands on x and y pulled out (z axis ligands pulled in)
What degeneracy shows structural observed
.In eg levels
.degeneracy in t2g only detected magnetically
.larger for eg as directed as ligands
How is colour observed in transition metal complexes
.absorb photons from white light
.energy photon corresponds to transition of electron from t2g orbital to eg orbital
.What colour does (Ti(OH2)6)3+
.appears violet colour transmitted
.white light minus light absorbed
What is the electronic spectrum of (Ti(OH2)6)3+
.spectra quite broad
.vibration still occurs
.transition into One of number vibrational states of excited states
.several overlapping bands observed
.E=hc/ wavelength to calculate delta o
Examples of other absorptions
.Ligand specta-Uv region and remains on coordination
.Counter ion spectra- overlapping absorption spectrum from counter ions NO2-
.Charge transfer spectra-between metal and ligand MnO4- ligand to metal and very intense
