CHEM 001C Lecture 11: Lecture 11 CHEM 001C: Coordination Chemistry
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CHEM 001C Lecture 11: Coordination Chemistry
●Write the formula for the following compounds:
○Potassium tricarbonyltricyanomanganate (III)
■K[Mn(CO)3(CN)3]
○Tetraaquadicyanoiron (III) chloride
■[(H2O)4(CN)2Fe] Cl
○Sodium bipyridinetetrachloroferrate (II)
■Na2[Fe(bipy)Cl4]
●Orbitals involved in bonding:
○Example:
■Ligands prefer to bond in empty s/p orbitals on metals
■Ligands approach the metal on the x, y, z axes
○Example:
■Which d orbitals would have the most repulsion with ligand lone pairs?
●dz2, dx2 - y2
○Both of these orbitals point at the ligands
●The remaining three d orbitals (dxy, dxz, dyz) point around ligands
○More repulsion = higher potential energy
●Weak vs. Strong Fields
○Weak field (high spin): ligands donate electron pairs more weakly
■Small ΔE0 (octahedral splitting energy)
○Strong field (low spin): ligands donate electron pairs more strongly
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