15.2 ULTRAVIOLET–VISIBLE SPECTROSCOPY

684 CHAPTER 15 DIENES, RESONANCE, AND visible SPECTROSCOPYThe IR and NMR spectra of conjugated dienes are very similar to the spectra of ordinaryalkenes. However, another type of SPECTROSCOPY can be used to analyze and identify organiccompounds containing conjugated p-electron systems. In this type of SPECTROSCOPY , called ul-traviolet visible SPECTROSCOPY ,the absorption of radiation in the ultraviolet or visible regionof the spectrum is recorded as a function of wavelength. The part of the ultraviolet spectrumof greatest interest to organic chemists is the near ultraviolet (wavelength range 200X 10_9to 400X 10_9m). visible light, as the name implies, is electromagnetic radiation visible to thehuman eye (wavelengths from 400X 10_9to 750X 10_9m). Because there is a commonphysical basis for the absorption of both ultraviolet and visible radiation by chemical com-pounds, both ultraviolet and visible SPECTROSCOPY are considered together as one type of spec-troscopy, often called simply UV vis The UV Vis SpectrumLike any other absorption spectrum, the UV vis spectrumof a substance is the graph of radi-ation absorption by the substance versus the wavelength of the radiation.

684 CHAPTER 15 • DIENES, RESONANCE, AND AROMATICITY 15.2 ULTRAVIOLET–VISIBLE SPECTROSCOPY The IR and NMR spectra of conjugated dienes are very similar to the spectra of ordinary

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  Ultraviolet, Visible, Spectroscopy, 2 ultraviolet visible spectroscopy

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