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Why would the first excited state (A) transitions not be observed in UV-Vis Spectra for I2...

Why would the first excited state (A) transitions not be observed in UV-Vis Spectra for I2 ?

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Answer #1

I2 have one single bond. This is a covalent molecule.

there are no pi bond. so there are no chances the pi - pi* transition.

But in I2, there are sigma - sigma* transition occurs.

the energy gap between  sigma - sigma* is high in compare to pi - pi* gap.

During UV-Vis study the monochromatic light used can not excite the electron from sigma to sogma* due to higher energy gap.

Hence in UV-Vis spectra of I2, there are no peak or band.

Hence  first excited state (A) transitions not be observed in UV-Vis Spectra for I2.

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