Chapter 24 Spin and Color

Chapter 24 Spin and Color - Transition Me tals C rystal Fie...

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Transition Metals
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Crystal Field Theory Crystal Field Theory [Ni(NH 3 ) 6 ] 2+
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Ni Ni 2+ 2+ :NH :NH 3 3 d 8 Crystal Field Theory Crystal Field Theory [Ni(NH 3 ) 6 ] 2+
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Electrostatic Field present Electrostatic Field present + - - - - - - Crystal Field Theory Crystal Field Theory [Ni(NH 3 ) 6 ] 2+
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d-orbitals & repulsion
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d-orbital repulsion d-orbital repulsion d-orbitals (degenerate) E metal ion - no ligands metal ion with ligands
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O Crystal-Field Splitting Energy in an octahedral complex
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Magnitude of o depends on the particular ligand Strong Field Ligands Weak Field Ligands
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Spectrochemical Series Strong Field Ligands Weak Field Ligands o (S.F) >> o (W.F)
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Electron Configurations [Ti(H 2 O) 6 ] 3+ d 1 ion
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Electron Configurations [V(H 2 O) 6 ] 3+ d 2 ion Recall: Hund's Rule!!! V 4s2 3d3 V3+ 4s0 3d2 Mn3+ Mn 4s2 3d5 Mn3+ 4s0 3d4
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Electron Configurations [Cr(H 2 O) 6 ] 3+ d 3 ion
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Electron Configurations [Cr(H 2 O) 6 ] 2+ d 4 ion o ( Strong Field ) >> o ( Weak Field ) Is [Cr(H 2 O) 6 ] 2+ a high spin or low spin complex? How many unpaired electrons? Pairing > o Energy Pairing < o Energy LOW SPIN Complex HIGH SPIN Complex
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Is [Fe(CN) 6 ] ] 4- 4- paramagnetic or diamagnetic? paramagnetic
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This note was uploaded on 10/21/2009 for the course CHEM 2C taught by Professor Endrle during the Spring '08 term at UC Davis.

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Chapter 24 Spin and Color - Transition Me tals C rystal Fie...

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