What is the wavelength of maximum absorption by caffeine of ultraviolet-visible light (200 nm to 800 nm)
I found one site on the Internet that listed 272 nm as the peak for caffeine in water but the article did not mention if this was a maximum absorbance or not.
To determine the wavelength of maximum absorption by caffeine in the ultraviolet-visible light spectrum, you can refer to the caffeine's UV-Vis absorption spectrum. This spectrum shows the light absorbance of caffeine at different wavelengths within the range of 200 nm to 800 nm.
The most reliable approach to access the specific absorption spectrum of caffeine is to consult scientific literature or databases specializing in spectroscopy or compound properties. These sources often include detailed information about the absorption characteristics of various compounds, including caffeine.
A reliable database for chemical properties is the National Institute of Standards and Technology (NIST) Chemistry Web Book. You can visit the NIST Chemistry Web Book website and search for "Caffeine" to access its relevant properties and spectroscopic data. By examining the UV-Vis spectrum of caffeine, you can identify the peak wavelength of maximum absorption.
It is worth mentioning that the wavelength of maximum absorption for caffeine may vary slightly depending on factors such as solvent used, concentration, and temperature. Therefore, it is essential to consider consistent experimental conditions when interpreting the data.