Factors Influencing Absorption of Radiant Energy

There are various cardinal factors that govern measurement of absorption of radiant energy, namely  

These vital factors would be discussed briefly with specific examples hereunder  

A chromophore is a group which when attached to a saturated hydrocarbon produces a molecule that absorbs a maximum of visible of UV energy at some specific wavelength. 

A few typical examples having electronic absorption bands for various representive chromophores are provided in the following Table 21 1  

The absorption spectrum of a pharmaceutical substance depends partially upon the solvent that has been employed to solubilize the substance. A drug may absorb a miximum of radiant energy at a particular wavelength in one solvent but shall absorb practically little at the same wavelength in another solvent. These apparent changes in spectrum are exclusively due to various characteristic features, namely  

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