title: Photoacoustic and luminescence characterization of nitrogen heterocyclic aromatic UV-MALDI matrices in solution.
abstract: A group of nitrogen heterocyclic aromatic compounds used, among others, as UV-MALDI matrices was studied. By using spectroscopic, luminescence and photoacoustic techniques, as well as time resolved phosphorescence for singlet oxygen production determination, the behaviour of 9-aminoacridine (9AA), 3-aminoquinoline (3AQ), 2-(2-aminoethylamino)-5-nitropyridine (AAN) and 3,4-dihydro-7-methoxy-1-methyl-9H-pyrido[3,4-b] indole (harmaline, HLA) in acetonitrile solutions is described. The results show that for these compounds radiationless processes that release prompt heat to the media are a quite important deactivation mechanism.
authors.affiliation: CIHIDECAR-CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, 3 Ciudad Universitaria, (1428) Buenos Aires, Argentina.
authors.forename: Gabriela
authors.initials: G
authors.lastname: Petroselli
authors.forename: Rosa
authors.initials: R
authors.lastname: Erra-Balsells
authors.forename: Pedro David
authors.initials: PD
authors.lastname: Gara
authors.forename: Gabriel M
authors.initials: GM
authors.lastname: Bilmes
mesh_terms: D000097:Acetonitriles / Q000737:chemistry; D000585:Aminacrine / Q000737:chemistry; D000634:Aminoquinolines / Q000737:chemistry; D006246:Harmaline / Q000737:chemistry; D006571:Heterocyclic Compounds / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D061088:Photoacoustic Techniques; D011725:Pyridines / Q000737:chemistry; D026082:Singlet Oxygen / Q000032:analysis; D012996:Solutions / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013056:Spectrophotometry, Ultraviolet
chemical_list: C539053:2-(2-aminoethylamino)-5-nitropyridine; D000097:Acetonitriles; D000634:Aminoquinolines; D006571:Heterocyclic Compounds; D011725:Pyridines; D012996:Solutions; D026082:Singlet Oxygen; D000585:Aminacrine; D006246:Harmaline; D009584:Nitrogen; C032159:acetonitrile