Unveiling the photophysical properties of 3-acyl-6-amino-4-quinolones and their use as proton probes
作者:Amanda R.P. Costa、Karine N. de Andrade、Micaeli L.S. Moreira、Vanessa G. Oliveira、José W.M. Carneiro、Fernanda da C.S. Boechat、Maria C.B.V. de Souza、Rodolfo G. Fiorot、Rodolfo I. Teixeira、Nanci C. de Lucas、Pedro N. Batalha
DOI:10.1016/j.dyepig.2022.110692
日期:2022.11
presence of trifluoroacetic acid alterations were observed in their photophysical profile, especially regarding their emissive response. The ester derivatives 1-alkyl-6-amino-4-oxo-1,4-dihydroquinoline-3-carboxylate exhibit a more significant increase in intensity (>2 times-fold) and a considerable redshift (∼90 nm), leading to emission colour change from blue to green in acidic condition. The changes were
4-喹诺酮衍生物在药物化学中被广泛探索,用于开发治疗不同病理的候选药物。然而,它们的光学特性仍未得到充分利用。在这项工作中,研究了 3-酰基-6-氨基-4-喹诺酮衍生物家族的光物理性质,突出了它们对酸的光学行为。虽然这些物质没有表现出明显的溶剂化显色性,但在三氟乙酸存在下在它们的光物理分布中观察到了变化,特别是在它们的发射响应方面。酯衍生物 1-烷基-6-氨基-4-氧代-1,4-二氢喹啉-3-羧酸酯表现出更显着的强度增加(> 2 倍)和相当大的红移(~90 nm),导致在酸性条件下,发射颜色从蓝色变为绿色。这些变化非常敏感,可检测到 MeCN 中低至 10 μM 的质子浓度。该分子系统通过 NMR 和 DFT 计算进行了研究,表明 1,3-二酮是首选的质子化位点。酮和羧基之间的分子内氢键的建立导致LUMO 稳定性和几乎共面的质子化结构,有利于荧光。值得注意的是,分子内或分子间氢键的存在对其