Properties of a triazolopyridine system as a molecular chemosensor for metal ions, anions, and amino acids.
The characteristics as a chemosensor of the compound 3-methyl-6,8-di(2-pyridyl)-[1,2,3]triazolo[5',1':6,1]pyrido[2,3-]pyrimidine (1) have been analyzed. Interaction with Cu(2+) produces a quenching of the fluorescence, while interaction with Zn(2+) leads to a quenching of the fluorescence followed by a bathochromic shift. The crystal structure of the Zn(1)(H(2)O)(3)(ClO(4))(2) x H(2)O complex shows the coordination of Zn(2+) through the terpyridine moiety. The octahedral site is completed by three water molecules. Interactions of the Zn(2+) complex with the anions sulfate, nitrate, nitrite, and dihydrogenphosphate in ethanol produce hypsochromic shifts and restoration of the fluorescence whose magnitude depends on the anion involved. The maximum interaction is observed for H(2)PO(4)(-). Interactions of the Zn(2+) complex with the amino acids l-aspartate and l-glutamate have also been explored showing a higher interaction with l-aspartate.
Chadlaoui
Mimoun
M
Departament de Química OrgAnica, Facultat de Farmacia, Universitat de València, 46100 Burjassot, Spain.
Abarca
Belén
B
Ballesteros
Rafael
R
Arellano
Carmen Ramírez de
CR
Aguilar
Juan
J
Aucejo
Ricardo
R
García-España
Enrique
E
D000596:Amino Acids / Q000032:analysis*; D000838:Anions / Q000032:analysis*; D002412:Cations / Q000032:analysis*; D018360:Crystallography, X-Ray; D008670:Metals / Q000032:analysis*; D011725:Pyridines / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
D000596:Amino Acids; D000838:Anions; D002412:Cations; D008670:Metals; D011725:Pyridines