Balevičius Vytautas, Gdaniec Zofia, Džiaugys Lukas, Kuliešius Feliksas, Maršalka Arūnas
Acta Chim Slov. 2011 Sep;58(3):458-64.
The ionic liquid 1-decyl-3-methyl-imidazolium bromide [C10mim][Br], the neat material, and also dissolved (~0.01 mole fraction) in various dielectric media (acetonitrile, benzene, chloroform, dichloromethane, methanol, 2-butanol and H2O) was studied using 1H and 13C NMR spectroscopy. The most important interaction in this compound is considered to be the Br-...H-C2+ hydrogen bond, which is formed between the anions and cations. The obtained results show that dielectric medium influence mostly the behavior of the Br-...H-C2+ bridge proton. The changes observed in 1H and 13C NMR spectra of [C10mim][Br] with increasing solvents polarity and temperature can be explained applying the model of the lengthening of the H2...Br- bond with the accompanying thickening of the solvation shell of bromine anion and C2-H bond contraction. The short-range order effects related to the configuration of neighboring dipoles of solvent molecules are more important for the solvation ability of small anions than the bulk solvent field effect. However, the solvents, molecules of which tend to associate via hydrogen bonding, can significantly affect the dynamics of anions.
使用1H和13C核磁共振光谱研究了离子液体1-癸基-3-甲基咪唑溴盐[C10mim][Br]，包括纯物质以及溶解于各种介电介质（乙腈、苯、氯仿、二氯甲烷、甲醇、2-丁醇和水）中的情况（摩尔分数约为0.01）。该化合物中最重要的相互作用被认为是Br-...H-C2+氢键，它在阴离子和阳离子之间形成。所得结果表明，介电介质主要影响Br-...H-C2+桥连质子的行为。随着溶剂极性和温度的增加，[C10mim][Br]的1H和13C核磁共振光谱中观察到的变化可以用H2...Br-键伸长以及溴阴离子溶剂化壳增厚和C2-H键收缩的模型来解释。与溶剂分子相邻偶极子构型相关的短程有序效应对于小阴离子的溶剂化能力比整体溶剂场效应更重要。然而，其分子倾向于通过氢键缔合的溶剂会显著影响阴离子的动力学。
