1. Predict the spin-only magnetic moment (in units of Bohr-Magnetons) for the following complexes:
a. fac-[Co(NH3)3Cl3]
b. trans-[Cr(ox)2Br2]4–
c. trans-[Cr(en)2(CN)2]
2. The rate data shown below was found for the reaction:
[Co(NH3)5X]2+ + OH– → [Co(NH3)5OH]2+ + X–
What is the order of the reaction? Is this enough information to determine the mechanism of the reaction? If so, what is the mechanism? If not, does it limit the mechanistic options (give the possibilities if this is the case)? What drives the trend in the rate constants? Does this help determine the mechanism? Why or why not?
X
k (M–1s–1)
F
0.012
Cl
0.85
Br
7.5
I
23
3. The rate data shown below was found for the reaction:
[Co(NH3)5X]2+ + [Cr(H2O)6]2+ → Co2+ + 5 NH3 + [Cr(H2O)5X]2+ + H2O
What is the order of the reaction? Is this enough information to determine the mechanism of the reaction? If so, what is the mechanism? If not, does it limit the mechanistic options (give the possibilities if this is the case)? What drives the trend in the rate constants? Does this help determine the mechanism? Why or why not?
X
k (M–1s–1)
F
2.5×105
Cl
6.0×105
Br
1.4×106
I
3.0×106