The pH of HNO donation is modulated by ring substituents in Piloty's acid derivatives: azanone donors at biological pH
作者:Kiran Sirsalmath、Sebastián A. Suárez、Damián E. Bikiel、Fabio Doctorovich
DOI:10.1016/j.jinorgbio.2012.10.008
日期:2013.1
A group of Piloty's acid (N-hydroxybenzenesulfonamide) derivatives were synthesized and fully characterized in order to assess the rates and pH of HNO (azanone, nitroxyl) donation in aqueous media. The derivatives, with electron-withdrawing and -donating substituents include methyl, nitro, fluoro, tri-isopropyl, trifluoromethyl and methoxy groups. The most interesting modulation observed is the change
一组Piloty's酸(N为了评估在水性介质中HNO(氮杂酮,硝酰)的捐赠速率和pH值,合成并对其进行了全面表征。具有吸电子和供电子取代基的衍生物包括甲基,硝基,氟,三异丙基,三氟甲基和甲氧基。观察到的最有趣的调节是化合物能够捐赠HNO的pH范围的变化。在不同pH值下的紫外线可见动力学测量用于评估供体的分解速率。通过直接测量[HNO],使用基于钴卟啉传感器的电化学测量的新技术来评估HNO的释放与pH的关系。将结果与DFT计算结果进行了对比,以了解环取代基所产生的电子效应,大大改变了捐赠的pH范围。例如,当Piloty's酸从pH 9.3捐赠HNO时,相应的氟衍生物在pH 4.0时开始捐赠。