What are the key differences between UV-Vis and IR spectroscopy techniques and how do they each contribute to the analysis of chemical compounds?

UV-Vis spectroscopy measures the absorption of ultraviolet and visible light by a compound, providing information on electronic transitions. IR spectroscopy measures the absorption of infrared light by a compound, providing information on molecular vibrations. UV-Vis is useful for analyzing conjugated systems and determining the presence of certain functional groups, while IR is useful for identifying specific functional groups and determining molecular structure. Both techniques are valuable for characterizing chemical compounds and can be used together for a more comprehensive analysis.