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The solid-state photochemistry of N-methyl diphenylamine (MDPA) has been investigated. This compound undergoes the following reactions: (Image Omitted)
English (United States)
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Materials for Holographic Optical Elements and Optical Memories
The solid-state photochemistry of N-methyl diphenylamine (MDPA) has been
investigated. This compound undergoes the following reactions:
MDPA undergoes the above adiabatic photocyclization reaction in the triplet
state to yield a zwitterionic transient species (Z) with a broad unstructured
absorption band at 610 nm. In solution, Z is oxidized to MC. The thermal
formation of MC competes with photochemical and thermal ring-opening
reactions that lead back to the parent amine.
Experiments have been performed with films of MDPA in a
poly(methylmethacrylate) (PMMA) host. The results indicate that the
photochemical behavior of MDPA in this rigid matrix is very similar to what has
been observed in liquid solutions. Irradiation with UV light from a Hg lamp leads
to the formation of MC in high chemical yield (about 50%). The course of this
reaction has been followed by monitoring the absorption spectrum. Marked
isosbestic points indicate a clean conversion of reactant to product. Additional
illumination with red (647 nm) light from a Kr laser inhibits the formation of MC,
as could be seen from the lack of MC fluorescence from the spots hit by the laser
beam. These spots became fluorescent after the red light was blocked.
Two-photon holographic recording has been demonstrated by writing a
holographic grating into the film using 647 nm light from a Kr laser in conjunction
with a Hg lamp. Efficien...