spectroscopy

Question

UV-Visible spectroscopy is useful for detecting:

RankGuru · Accepted Answer

**UV-Visible Spectroscopy** studies the electronic transitions within a molecule.
- **Detection**: It is extremely useful for identifying **chromophores** - groups that absorb light. Specifically, it detects **conjugated $\pi$ systems** (like in polyenes or aromatic rings) and carbonyl groups.
- **Requirement**: Saturated compounds (like alkanes) only show $\sigma 	o \sigma^*$ transitions, which occur in the vacuum-UV region ($< 200 	ext{ nm}$) and are typically not measurable with standard instruments. Conjugated systems lower the energy required for excitation, shifting the absorption into the measurable UV or visible range.

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spectroscopy

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