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