Help with electronic transitions?

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thenextchemist
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The complexes [W(CO)5L] show an intense absorption band in the UV / visible spectral region whose wavelength depends on L:
355 nm (pyridine)
347 nm (3,4-di-methyl-pyridine)
440 nm (4-acetyl-pyridine)
455 nm (4-cyano-pyridine).

Which electronic transition is responsible for the absorption band? Explain the ligand dependence.

Would the answer be MLCT transitions as they occur in the visible or UV region. But I'm not too sure about the ligand dependence?

Edit: LMCT also occur in UV region.
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MexicanKeith
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#2
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(Original post by Bloom77)
The complexes [W(CO)5L] show an intense absorption band in the UV / visible spectral region whose wavelength depends on L:
355 nm (pyridine)
347 nm (3,4-di-methyl-pyridine)
440 nm (4-acetyl-pyridine)
455 nm (4-cyano-pyridine).

Which electronic transition is responsible for the absorption band? Explain the ligand dependence.

Would the answer be MLCT transitions as they occur in the visible or UV region. But I'm not too sure about the ligand dependence?

Edit: LMCT also occur in UV region.
Have a look in shriver and atkins (I had a look in fourth edition), see what it says about the oxidation state of the metal and what that means for the occurance of LMCT or MLCT.
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thenextchemist
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#3
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(Original post by MexicanKeith)
Have a look in shriver and atkins (I had a look in fourth edition), see what it says about the oxidation state of the metal and what that means for the occurance of LMCT or MLCT.
Thanks will do!
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