Huynh Han Vinh, Lam Truc Tien, Luong Huyen T T
Department of Chemistry, National University of Singapore 3 Science Drive 3 117543 Singapore Republic of Singapore
RSC Adv. 2018 Oct 12;8(61):34960-34966. doi: 10.1039/c8ra05839c. eCollection 2018 Oct 10.
A series of 16 benzimidazolium salts of the type Pr-bimyHX with various anions X were synthesized and characterized by various spectroscopic and spectrometric methods. Significant anion and solvent effects on the chemical shifts of the C2-H protons were found, which allows for a ranking of the anions in terms of their hydrogen-bond acceptor properties. Stronger acceptors could increase the acidity of their respective salts leading to a faster H/D exchange. Similar but less pronounced anion influences were detected for the C NMR resonances, while coupling constants appear to be anion and solvent independent.
合成了一系列16种Pr-bimyHX类型且带有各种阴离子X的苯并咪唑鎓盐，并通过各种光谱和光谱测定方法对其进行了表征。发现阴离子和溶剂对C2-H质子的化学位移有显著影响，这使得可以根据其氢键受体性质对阴离子进行排序。更强的受体可以提高其各自盐的酸度，从而导致更快的H/D交换。对于碳核磁共振共振检测到了类似但不太明显的阴离子影响，而耦合常数似乎与阴离子和溶剂无关。
