Solvent, structural, quantum chemical study and antioxidative activity of symmetrical 1-methyl-2,6-bis[2-(substituted phenyl)ethenyl]pyridinium iodides
作者:Milena D. Milošević、Nevena Ž. Prlainović、Miloš Milčić、Vesna Nikolić、Aleksandra Božić、Miljan Bigović、Aleksandar D. Marinković
DOI:10.1007/s13738-018-1437-5
日期:2018.11
quotient of the occupations for the bonding π and anti-bonding π* orbitals of this bond was considered. Good correlations of the selected parameter between double bond lengths with π*/π and 13C chemical shift differences of the bridging group proved them to be adequate descriptor of push–pull character. Synthesized compounds were screened for the antioxidant activity, using 1,1-diphenyl-2-picrylhydrazyl
在这项工作中,合成了15个对称的1-甲基-2,6-双[2-(取代的苯基)乙烯基]吡啶鎓碘化物。使用IR,1 H和13 C NMR和UV-Vis光谱对它们的结构进行了表征。DFT计算表明s -trans / s -trans构象普遍存在于所有化合物中。使用线性无溶剂化能量关系(LSER),即Kamlet-Taft和Catalán模型,评估了特定和非特定溶剂-溶质相互作用对UV-Vis吸收最大位移的影响。采用单取代基参数方程(SSP)形式的线性自由能关系(LFER)来假设取代基对NMR数据的定量结构-性质关系。TD-DFT结果表明电子跃迁对取代基效应的依赖性。通过与吡啶鎓中心环交叉共轭的2位和6位烯键式双键在13 C化学位移方面的差异分析了这些化合物的推挽特性。同样,键π的职业的商并考虑了该键的反键π *轨道。带有π * / π的双键长度和桥接基团的13 C化学位移差异之间所选参数的良好相关性证明,它们是推挽特性的充分描述。使用1