Photodegradation studies by laser-induced fluorescence of the reaction product of 1,2-indanedione and glycine

Photodegradation of the reaction product of 1,2-indanedione with glycine in methanol at room temperature has been studied using laser-induced fluorescence. Samples were liquid solution and developed fingerprints on papers. Continuous laser excitation of fresh solution of 1,2-indanedione-glycine dissolved in methanol shows that the emission peak at 564 nm reached a quite stable low level after almost 1 hr of continuous excitation. For latent fingerprints on papers developed with 1,2-indanedione dissolved in methanol solution, the luminescence peak decreases for the first week and reached a stable level for almost 2 weeks. A long-term study is needed to reach a conclusion on the stability of the samples (liquid and developed fingerprints) at room temperature conditions.