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In the first row high-spin transition metal complexes [M(H2O)6]Cl2 with d5 and d7 metal ions, the
d-d transitions are
d-d transitions are
- a)spin-forbidden for both
- b)spin-allowed for both
- c)spin-forbidden for d5 and spin-allowed for d7
- d)spin-allowed for d5 and spin-forbidden for d7
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
In the first row high-spin transition metal complexes [M(H2O)6]Cl2 wit...
Explanation:
High-spin transition metal complexes [M(H2O)6]Cl2 with d5 and d7 metal ions have different electronic configurations, which affect the nature of their d-d transitions.
Spin-forbidden transitions
Spin-forbidden transitions occur when the spin state of the initial and final electronic configurations of the complex differ by more than one. These transitions are usually weak or nonexistent, as they violate the conservation of spin angular momentum.
Spin-allowed transitions
Spin-allowed transitions occur when the spin state of the initial and final electronic configurations of the complex differ by only one. These transitions are usually strong and observable in the UV-Vis spectra of the complexes.
d5 metal ions
A d5 metal ion has five electrons in the d-orbitals, with all five electrons having the same spin. The electronic configuration of [M(H2O)6]2+ is d5, and the complex has a high-spin state.
In this case, the d-d transitions are spin-forbidden. This is because the spin state of the initial and final electronic configurations of the complex differ by more than one, violating the conservation of spin angular momentum. Therefore, no d-d transitions are observed in the UV-Vis spectra of [M(H2O)6]Cl2 with d5 metal ions.
d7 metal ions
A d7 metal ion has seven electrons in the d-orbitals, with three electrons having one spin and four electrons having the opposite spin. The electronic configuration of [M(H2O)6]2+ is d7, and the complex has a high-spin state.
In this case, the d-d transitions are spin-allowed. This is because the spin state of the initial and final electronic configurations of the complex differ by only one, satisfying the conservation of spin angular momentum. Therefore, d-d transitions are observed in the UV-Vis spectra of [M(H2O)6]Cl2 with d7 metal ions.
Conclusion
In summary, the d-d transitions in high-spin transition metal complexes [M(H2O)6]Cl2 with d5 metal ions are spin-forbidden, while those with d7 metal ions are spin-allowed. This is due to the different electronic configurations and spin states of the complexes.
High-spin transition metal complexes [M(H2O)6]Cl2 with d5 and d7 metal ions have different electronic configurations, which affect the nature of their d-d transitions.
Spin-forbidden transitions
Spin-forbidden transitions occur when the spin state of the initial and final electronic configurations of the complex differ by more than one. These transitions are usually weak or nonexistent, as they violate the conservation of spin angular momentum.
Spin-allowed transitions
Spin-allowed transitions occur when the spin state of the initial and final electronic configurations of the complex differ by only one. These transitions are usually strong and observable in the UV-Vis spectra of the complexes.
d5 metal ions
A d5 metal ion has five electrons in the d-orbitals, with all five electrons having the same spin. The electronic configuration of [M(H2O)6]2+ is d5, and the complex has a high-spin state.
In this case, the d-d transitions are spin-forbidden. This is because the spin state of the initial and final electronic configurations of the complex differ by more than one, violating the conservation of spin angular momentum. Therefore, no d-d transitions are observed in the UV-Vis spectra of [M(H2O)6]Cl2 with d5 metal ions.
d7 metal ions
A d7 metal ion has seven electrons in the d-orbitals, with three electrons having one spin and four electrons having the opposite spin. The electronic configuration of [M(H2O)6]2+ is d7, and the complex has a high-spin state.
In this case, the d-d transitions are spin-allowed. This is because the spin state of the initial and final electronic configurations of the complex differ by only one, satisfying the conservation of spin angular momentum. Therefore, d-d transitions are observed in the UV-Vis spectra of [M(H2O)6]Cl2 with d7 metal ions.
Conclusion
In summary, the d-d transitions in high-spin transition metal complexes [M(H2O)6]Cl2 with d5 metal ions are spin-forbidden, while those with d7 metal ions are spin-allowed. This is due to the different electronic configurations and spin states of the complexes.
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In the first row high-spin transition metal complexes [M(H2O)6]Cl2 with d5 and d7 metal ions, thed-d transitions area)spin-forbidden for bothb)spin-allowed for bothc)spin-forbidden for d5 and spin-allowed for d7d)spin-allowed for d5 and spin-forbidden for d7Correct answer is option 'C'. Can you explain this answer?
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