Effect of substituents on spin density in benzimidazole nitronyl nitroxide radicals studied by electron spin resonance
作者:Burak Esat、Ismail Fidan、Sumeyye Bahceci、Yusuf Yerli、Levent Sari
DOI:10.1002/mrc.2443
日期:2009.8
Several novel benzimidazole‐3‐oxide‐1‐oxyl radicals with substituents at 5 and/or 6 position were synthesized. The ESR analysis of nitrogen hyperfine coupling constants (hfccs) revealed that substituents at 5 and 6‐position affect the spin density to greater extent than substituents on the phenyl ring at 2‐position. Density functional theory calculations of nitrogen hfccs were performed using several
合成了几种在 5 和/或 6 位具有取代基的新型苯并咪唑-3-氧化物-1-氧基。氮超精细耦合常数(hfccs)的 ESR 分析表明,5 位和 6 位的取代基比 2 位苯环上的取代基对自旋密度的影响更大。氮 hfccs 的密度泛函理论计算是使用几种不同的 Pople 型基组,以及局部轨道(IGLO-II、IGLO-III)和电子顺磁共振(EPR-II、EPR- II) 基组。实验和理论 hfcc 进行了比较。版权所有 © 2009 John Wiley & Sons, Ltd.