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Chemistry / Chemistry: The Molecular Nature of Matter and Change 5 / Chapter 23 / Problem 23.105

Chemistry: The Molecular Nature of Matter and Change | 5th Edition | ISBN: 9780077216504 | Authors: Martin S. Silberberg

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[Cr(H2O)6] 2 is violet. Another CrL6 complex is green. Can

Chapter 23, Problem 23.105

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QUESTION:

[Cr(H2O)6]+2 is violet. Another CrL6 complex is green. Can ligand L be CN¯? Can it be Cl¯? Explain.

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QUESTION:

[Cr(H2O)6]+2 is violet. Another CrL6 complex is green. Can ligand L be CN¯? Can it be Cl¯? Explain.

ANSWER:

Step 1 of 4

The octahedral splitting energy of transition elements is the difference in the energy of the d-orbitals of the ligand, which depends on the strength of the ligand.

The complex with a fewer number of unpaired electrons is called the low-spin complex, and the complex with the higher number of unpaired electrons is called high -spin complex.

The molecule that forms a high-spin complex isa weak field complex. Thus, electrons do not have sufficient energy to get paired.

In contrast, molecules that form a low-spin complex are strong field complexes. Thus, the electrons get paired.

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