Recall: ↑ degree of conjugation = ↑ λmax
The structures of the dye are:
Spectroscopy is the study of interaction between matter (molecules and atoms) and radiation (e.g. infrared radiation). We use these interactions to obtain information about substances, such as concentration of solutions and the structure of molecules. Different matters interact with radiation differently. The nature of the interaction and the region of the electromagnetic spectrum where these interactions occur depend on the structure of molecules (or atoms). An absorption spectrum is a plot of absorbance versus wavelength, in which the wavelength of maximum absorbance, λmax, is where the absorbance (interaction) is the greatest. For example, as shown in Figure 1, the maximum absorbance (λmax) of the substance is 520 nm.
Match each dye in the left column with its wavelength of maximum absorbance in the right column.
Red dye #40
Yellow dye #5
Blue dye #1
Answer choices: 628 nm, 504 nm, 427 nm
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