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Unformatted text preview: Dr. Woodward Chemistry 123 Sample Quiz 1 Spring 2007 Quiz 5 20 Minutes Name _____________________________________ Lab Inst. ___________ Two-Digit Section Number ___________ ALL WORK MUST BE SHOWN TO RECEIVE FULL CREDIT
1. The absorption maximum for the complex ion [Co(NH3)6]3+ occurs at 470 nm.
(a) [2 points] Predict the color of this complex. (b) [2 points] If the cobalt ion adopts a low spin
configuration draw the crystal-field energy-level
diagram and show the placement of the delectrons? (c) [4 points] Calculate the crystal field splitting energy, Δ, in eV. (d) [2 points] Would you expect the absorption maximum of [Co(H2O)6]3+ to fall at a longer
or at a shorter wavelength (assume low spin configuration is maintained)? 2. [6 points] The following pictures show two molecular orbitals of the many that exist for a MoF6
molecule, which has octahedral geometry. For each MO, identify the atomic orbitals involved in
forming the molecular orbital (Mo 5s, 5p, 4d; F 2s, 2p), and classify the molecular orbital as
bonding, antibonding or non-bonding. [The Mo atom is at the center of the molecule, it is
surrounded by six fluorine atoms] Error! Q5-R 11:30 1 3. Draw all stereoisomers (geometric and/or optical) for the following complexes:
(a) [4 points] octahedral [Co(NH)3Cl3]+ (b) [4 points] square planar [PdBr2Cl2]2– 4. [3 points] The figure below shows the absorption spectra for a transition metal complex
[M(NH3)6]2+ (where M is a transition metal ion). What would be the color of this complex? How
would the absorption peak at ~610 nm shift if the NH3 ligands were replaced with H2O? 2.0
1.6 absorbance 1.4
200 300 400 500 600 700 800 900 wavelength (nm) Q5-R 11:30 2 ...
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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.
- Spring '08