Everything about Photoisomerization totally explained
In
chemistry,
photoisomerization is
molecular behavior in which structural change between
isomers is caused by photoexcitation. Both reversible and irreversible photoisomerization reactions exist. However, the word "photoisomerization" usually indicates a reversible process. Photoisomerizable molecules are already put to practical use, for instance, in
pigments for
rewritable CDs,
DVDs, and
3D optical data storage solutions. In addition, recent interest in photoisomerizable molecules has been aimed at molecular devices, such as molecular switches, molecular motors, and molecular electronics.
Photoisomerization behavior can be roughly categorized into two classes:
trans (or
E) and
cis (or
Z) conversion, and open ring and closed ring transition. Instances of the former include
stilbene and
azobenzene. This class of compounds has a double
bond, and rotation or inversion around the double bond affords isomerization between the two states. Examples of the latter include
fulgide and
diarylethene. These types of compounds undergo bond cleavage and bond creation upon irradiation with particular wavelengths of light.
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