J. Quiroga, Paola Acosta, A. Ortíz
Oct 5, 2015
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Influential Citations
3
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract New pyrazolo[4′,3′:5,6]pyrido[2,3- d ]pyrimidin-5(6 H )-one derivatives 5 were prepared by cyclocondensation reaction between heterocyclic o -aminonitriles 3 and carboxylic acids 4 in the presence of sulfuric acid as catalyst. This procedure provides the desired compound in good yield with a simple one-step methodology. The obtained products show interesting fluorescence properties in both solution and solid state; in this way several spectra of absorption and emission were measured for selected compounds 5b , 5e , 5g and 5j , showing a broad and intense emission band around of 470 nm. In other to understand the electronic transition processes, theoretical calculations were performed at TD-DFT level, using B3LYP as functional and 6-31(d,p) as basis set, finding a good agreement with experimental measurements.