7. The following questions pertain to the octahedral spin crossover complex [Co(OH- terpy)2]2+ (assume the point group symmetry is Oh for both spin states).
7. The following questions pertain to the octahedral spin crossover complex [Co(OH- terpy)2]2+ (assume the point group symmetry is Oh for both spin states).
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter21: Transition Metals And Coordination Chemistry
Section: Chapter Questions
Problem 108IP: a. In the absorption spectrum of the complex ion Cr(NCS)63, there is a band corresponding to the...
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![7. The following questions pertain to the octahedral spin crossover complex [Co(OH-
terpy)₂]²+ (assume the point group symmetry is Oh for both spin states).
7²
HO
-OH
a. What is the oxidation state of the Co? Assuming o only interactions, what is the
valence electron count for this complex? Give the ground state term symbol for both
the high and low spin state.
b. What is the lowest-energy d-d transition you would expect to observe that has a large
extinction coefficient for each spin state? What allows this extinction coefficient to be
large despite being Laporte forbidden?
c. Besides optical measurements, magnetic measurements can also be used to observe
the change to a high-spin state. What ueff do you expect to see for each spin state?
Temperature is another way to induce a spin crossover within these types of
complexes. How do you expect the spin state to change with temperature?
d.
e. Do you expect to see a change in metal-ligand bond length with a change in spin
state? Why or why not?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F062e9ce8-6302-4a50-bee9-0ce9572f3b22%2Faed9d283-839b-4dfb-a363-7e4b323a86a1%2Fk82gc3r_processed.png&w=3840&q=75)
Transcribed Image Text:7. The following questions pertain to the octahedral spin crossover complex [Co(OH-
terpy)₂]²+ (assume the point group symmetry is Oh for both spin states).
7²
HO
-OH
a. What is the oxidation state of the Co? Assuming o only interactions, what is the
valence electron count for this complex? Give the ground state term symbol for both
the high and low spin state.
b. What is the lowest-energy d-d transition you would expect to observe that has a large
extinction coefficient for each spin state? What allows this extinction coefficient to be
large despite being Laporte forbidden?
c. Besides optical measurements, magnetic measurements can also be used to observe
the change to a high-spin state. What ueff do you expect to see for each spin state?
Temperature is another way to induce a spin crossover within these types of
complexes. How do you expect the spin state to change with temperature?
d.
e. Do you expect to see a change in metal-ligand bond length with a change in spin
state? Why or why not?
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