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Absorption Spectroscopy: What Can We Learn About . . . Hypochromic effect: If the geometry of the molecule is distorted due to the introduction of a new group, thus resulting in a decrease in intensity of absorption maximum, this is called as Hypochromic effect (Fig 1 6)
Uv visible-spectroscopy | PPT - SlideShare This document discusses chromophores and auxochromes in ultraviolet-visible spectroscopy It defines chromophores as groups that absorb in the UV-visible region and undergo π → π* or n → π* transitions Examples include ethylenic, carbonyl, and nitrile groups
UV - its lecture notes - UV-Visible spectroscopy UV- Visible . . . The introduction of groups which distorts the geometry of the molecule causes hypochromic effect For example, biphenyl absorbs at 250nm, εmax 19000 whereas 2-methyl biphenyl absorbs at 237nm, εmax 10250 It is due to distortion caused by the methyl group in 2-methyl biphenyl
Theories of Dyes | PDF | Foreign Language Studies | Art - Scribd It explains that chromophores are groups responsible for color, while auxochromes intensify color Common chromophores and auxochromes are listed, and bathochromic, hypsochromic, hyperchromic, and hypochromic shifts are defined based on how they affect absorption spectra
UV-Visible Spectroscopy Conjugation of the carbonyl group with double bond shifts both n→π* transition andπ→π* transition to longer wavelengths
Ultra-violet and visible Spectroscopy Introduction Introduction Ultraviolet-visible spectroscopy involves the absorption of ultraviolet visible light by a molecule , σ) from a grou ate So it is also called Electron c Spectroscopy Substance absorbing in the v range will appear coloured to the human eye