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Prepared by Lawrence Kok
Video Tutorial on Properties of Transition Metals, Complex ions and splitting of d orbitals for colour formation .
Properties of Transition metals • Coloured Complexes
• Variable oxidation states• Catalytic Properties
• Complex ions
Taken from:http://elementalolympics.wordpress.com/2011/02/28/variable-oxidation-states-and-catalysts/
Taken from:http://alevelchem.com/aqa_a_level_chemistry/unit3.5/s354/02.htm
Taken from:http://www.chemguide.co.uk/inorganic/transition/features.html
Properties of Transition Metals – Complex ions formation
Drawing complex ion• Overall charged on complex ion metal• Metal ion in the center (+ve charged)• Ligands attached• Dative bonds from ligands
Strong ligand displaces weaker ligand
Complex ions with different ligands – different colours
Copper with ligand water – BlueCopper with ligand ammonia – Deep BlueCopper with ligand chloride - Yellow
Cobalt with ligand water – PinkCobalt with ligand chloride - Blue
Taken from: http://www.chm.bris.ac.uk/webprojects2003/rogers/998/chemlab.htm
Properties of Transition Metals – Coloured Complexes
Why transition metals ion complexes have different colour?Why Titanium (III) ion is violet ?
Splitting of 3d orbitals by ligands – allow electronic transition from lower to higher state
Colour formation due to splitting of 3d orbitals by ligands
Ti 3+ transmit blue/violet region BUT absorb green/orange/red
Ti 3+ violet due to absorption of green/yellow region to excite electrons to higher orbital level
Cu 2+ transmit blue/violet region BUT absorb green/orange/red
Cu 2+ blue due to absorption of green/yellow to excite electrons to higher level
Transition metal have different colours due to• splitting of 3d orbitals• presence of ligands which causes splitting• partially filled 3d orbitals
CuSO4 (anhydrous) without ligands - Colourless
Why some are colourless ?
Cu 2+ anhydrous – colourlessCu 1+ hydrous – colourlessZn 2+ hydrous – colourlessSc 3+ hydrous – colourlessCu 2+ hydrous - colour
Taken from:http://comp.chem.umn.edu/itccd/Catalytics.html
Catalyst speed up reaction by
Taken from:http://gcserevision101.wordpress.com/chemistry-c3/
Uses of catalyst
Video on colour formation due to different ligands with different metals ionClick here to view
Acknowledgements
Thanks to source of pictures and video used in this presentation
Thanks to Creative Commons for excellent contribution on licenseshttp://creativecommons.org/licenses/
Prepared by Lawrence Kok
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