lect3_2007_transmetals

lect3_2007_transmetals - 1 Color and Bonding in Color and...

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Unformatted text preview: 1 Color and Bonding in Color and Bonding in Transition Metal Complexes Transition Metal Complexes [Ni(NH 3 ) 6 ] 2+ Cu 3 (CO 3 ) 2 (OH) 2 Malachite Al 2 O 3 :Cr 3+ Ruby Ruby Be 2 Al 2 Si 6 O 18 :Cr 3+ Emerald Emerald Intra Intra-atomic (d to d) excitations atomic (d to d) excitations In these complexes the color comes from absorption of light that leads to excitation of an electron from one d-orbital to a different d-orbital on the same metal cation . CuSO 4 NiSO 4 CoSO 4 FeSO 4 MnSO 4 ZnSO 4 2 [M(H [M(H 2 O) O) 6 ] n+ n+ Complex ions Complex ions M H 2 O MO MO 6 Octahedron Octahedron Energy Levels of Energy Levels of d-orbitals orbitals in an in an octahedron octahedron d xy xy d yz yz d xz xz d z2 z2 d x2 x2-y2 y2 d xy xy d yz yz d xz xz d z2 z2 d x2 x2-y2 y2 Free Cr 3+ ion Cr 3+ ion with a spherical crystal field Cr 3+ ion in an octahedral crystal field Energy d xy xy d yz yz d xz xz d z2 z2 d x2 x2-y2 y2 3 d z 2 & d & d x 2-y 2 orbitals ( orbitals ( e g ) Point directly at the ligands Stronger (repulsive) interaction with the ligands Crystal Field Splitting (Octahedron) Crystal Field Splitting (Octahedron) d z 2 d x 2-y 2 d xy xy d yz yz d xz xz Electrons in d-orbitals are repelled from the electrons in the ligands. The repulsion is stronger for electrons in d-orbitals pointing directly at the ligands....
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This note was uploaded on 06/03/2011 for the course CHM 123 taught by Professor Woodward during the Spring '08 term at Ohio State.

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lect3_2007_transmetals - 1 Color and Bonding in Color and...

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