Transition metals
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Transition metal
• d block element • forms one or more ion with an incomplete d sub-shell
Transition metal ions
• loses electrons from 4S sub-shell • 3d electrons repel 4S electrons to higher energy level 3.
Chromium electronic configuration
[Ar]4s13d5
Copper electronic configuration
[Ar]4s13d10
Transition metal properties
• form coloured compounds in more than one oxidation state • form coloured compounds • act as catalysts • form various complex ions • high melting and boiling point
Various oxidation states
• lose 4S electrons- all form ion 2+ • similair atomic radius and ionisation energies
Heterogenous catalysts
• use d orbitals to adsorb molecules • can be toxic • reduce energy for industrial processes
Examples of catalysts
• iron in Haber process • aqeous Cu2+ for zinc with acids • MnO2 for decomposition of H2O2
Ligand
• molecule or ion • at least one lone pair of electrons • bonds to central metal ion by dative co-ordinate bond
Co-ordinate bond
• dative covalent • between ligand and central metal ion
Complex ion
ion with multiple molecules/anion bound to central metal ion by co-ordinate bonds
Co-ordination number
number or co-ordinate bonds to central metal ion from surrounding ligands
Co-ordination number 6
octahedral 90°
Co-ordination number 4 with same ligand
tetrahedral 109.5°
Co-ordination number 4 with different ligands
square planar 90°
Co-ordination number 2
Linear 180°
Monodentate ligands
H2O NH3 Cl- OH- CN-
Bidentate ligands
-OOCCOO- -H2NCH2CH2NH2-
Optical isomerism
• bidentate ligands • octahedral
E/Z isomers square planar [MX2Y2)
• E- same vertical side • Z- diagonal sides
E/Z isomers octahedral [M(X)2(Y)4]
• Z- X is 90° (top and triangle block) • E- X is 180° (top and bottom)
Cis-platin advantage
• chemotherapy • binds to DNA of cancerous cells • prevents division
Cis-platin disadvantage
• unpleasant side-effects • trans-platin is ineffective
Haemoglobin
• Fe2+ metal complex ion • ligand substitution- nitrogen with oxygen • transported round the blood • also substituted with CO