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Transient spectroscopy of ninhydrin.

Mark H Kleinman¹, João P Telo, Abel J S C Vieira

¹Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC, Canada.

Photochemistry and Photobiology

|July 15, 2003

Summary

Ninhydrin photochemistry differs in benzene and water. Solvent influences excited states and radical formation, impacting hydrindantin production and hydroxyl radical generation.

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Area of Science:

Photochemistry
Physical Chemistry
Spectroscopy

Background:

Ninhydrin is a versatile chemical reagent.
Understanding its photochemical behavior is crucial for various applications.
Solvent effects on photochemical reactions are complex and require detailed study.

Purpose of the Study:

To investigate the photochemistry of ninhydrin in different solvents (benzene and water).
To elucidate the mechanisms of radical formation and subsequent reactions.
To determine the pKa of relevant protonation equilibria and assess its potential for hydroxyl radical generation.

Main Methods:

Laser flash photolysis
Electron paramagnetic resonance (EPR) spectroscopy

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Main Results:

Ninhydrin exhibits solvent-dependent photochemistry.
In benzene, a triplet excited state undergoes hydrogen abstraction or reduction to a radical anion.
In water, solvent pH dictates the formation of the radical anion or the neutral ketyl radical, with a determined pKa of 0.77. Hydrindantin formation is proposed via radical dimerization.
Ninhydrin is an inefficient precursor for photogenerated hydroxyl radicals.

Conclusions:

The photochemistry of ninhydrin is significantly influenced by the solvent environment.
Radical intermediates play a key role in ninhydrin's photochemical pathways.
Ninhydrin's utility in generating hydroxyl radicals photochemically is limited.