A student is studying the magnetic and kinetic properties of a transition metal

Question

A student is studying the magnetic and kinetic properties of a transition metal complex as we did in this laboratory experiment. Use the experimental information below to determine the d-electron configuration of the transition metal ion. From kinetic studies, it is determined that the metal center is inert. From this observation, determine which d-electron configurations are possible candidates for our unknown complex. Sort the d-electron configurations below into the appropriate "possible d-electron configurations" and "impossible d-electron configurations" bins. From magnetic studies, it is determined that there is one unpaired electron. From this observation, determine which d-electron configurations are possible candidates for our unknown complex. Sort the d-electron configurations below into the appropriate "possible d-electron configurations" and "impossible d-electron configurations" bins. b) Based upon the experimental observations and the conclusions you made above, what must the d-electron configuration of the complex be?

Explanation / Answer

Given one unpaired electron

first consider d5 (high spin)

for high spin , the electrons will not paired , so there will be 5 unpaired electrons

now consider   d7 (high spin)

for high spin , electrons will not pair , so there will be 3 unpaired electrons

now consider d5 (low spin)

for low spin , the electrons will pair up . So there will be 1 unpaired electron

now consider d6(l0w spin)

for low spin , the electrons will pair up , so there will be zero unpaired electrons

now consider d9

it has 1 unpaired electron

now consider d3

it has 3 unpaired electrons

now consider d6 (high spin)

electrons will not pair up . So there will be 4 unpaired electrons

now consider d4 (high spin)

electrons will not pair up . so there will be 4 unpaired electrons

now consider d7 ( low spin)

electrons will pair up . so there will be 1 unpaired electron

now consider d2

there will be 2 unpaired electrons

now consider d4 (low spin)

electrons will pair up , so there are zero unpaired electrons

now consider d1

there will one unpaired electron

now consider d10

there will zero unpaired electrons

now consider d8

there will be 2 unpaired electrons

So the possibilites for 1 unpaired electron are

d5 (low spin)

d9

d1

d7 ( low spin)

impossible configurations are

d8

d10

d4 ( low spin)

d2

d4 (high spin)

d6 (high spin)

d3

d6 (low spin)

d7(high spin)

d5 (high spin)

looking at both the experimental and the conclusions

the d-electron configuration of the complex may be

d1 or d9 or d5 (low spin)

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