Chemistry 123

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Chemistry 123

• Week of 24 March 2008

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Linkage isomers
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Geometric isomers
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Tetrahedral geometry
Not possible to have cis-trans isomers!
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Geometric isomers
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Geometrical optical isomers
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Stereoisomers geometric and optical
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Isomer

• Type of isomers?
• geometric
• Name
• Left cis-diamminedichloroplatinum(II)
• Right trans-diamminedichloroplatium(II)

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Isomers

• Type of isomers?
• Coordination isomers

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Isomers

• Type of isomers?
• Geometric (mer/fac)
• Name
• Left fac-triamminetrichlororuthenium(III)
• Right mer-triamminetrichlororuthenium(III)

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Isomers

• Type of isomers?
• Linkage
• Name
• Pentaaquathiocyanoiron(III) (left)
• Pentaaquaisothiocyanoiron(III) (right)

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Number of isomers

• How many isomers would you predict for the
  complex ion CoBr2Cl2(NH3)2- ?
• 6 isomers
• Two all-cis isomers (stereoisomers of each other)
• One all-trans
• Three with one set trans

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Valence bond theory
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Gouy balance

• Measure magnetic susceptibility
• Determine number of unpaired electrons

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Valence bond theory
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Valence bond theory
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Complementary colors
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Octahedral field splitting
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d-orbitals within octahedron
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Octahedral field splitting
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MO levels for octahedral complex
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Effect of ligand on field splitting
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Absorbance and observed color
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Spectrochemical series
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Concept check

• Which of the following compounds is green,
  violet, yellow?
• Cr(H2O)63
• Cr(NH3)63
• Cr(H2O)4Cl2

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Check-in

• From the appearance of rubies and emeralds, which
  of these environments provides a larger crystal
  field splitting to the Cr3 ion and why?