# What is the frequency range in "cm"^(-1) of -OH in water using infrared spectrometry?

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Mar 15, 2017

I assume you mean for the $\text{OH}$ stretch of water in the IR region. Organic $\text{OH}$ stretches are typically around the 3200 ~ 3500 ${\text{cm}}^{- 1}$ range.

For water, it's a combination band of the symmetric stretch (${\nu}_{1}$), asymmetric stretch (${\nu}_{3}$), and symmetric bend (overtone of ${\nu}_{2}$) motions:

This is a Raman spectrum, but this particular vibrational motion is active in both Raman and IR, so this is a suitable proof of the frequency range.

You can see that its range is somewhere around bb(3200 ~ 3600) $\boldsymbol{{\text{cm}}^{- 1}}$. This website reports it as $3404.0$ ${\text{cm}}^{- 1}$.

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