CAJ | 학술논문

采用UV‐Hammett指示剂联用法，以对硝基苯胺为指示剂，考察了阴离子为硫酸氢根，阳离子分别为三乙胺、 N‐甲基咪唑、吡啶或己内酰胺上带有丙烷基磺酸或丁烷基磺酸的8种磺酸基功能化离子液体的酸强度。结果表明，同一种离子液体的浓度越大，其酸强度越大，但不同离子液体间的相对酸强度大小顺序与离子液体的浓度无关；含氮母体化合物不同的磺酸基离子液体按酸强度由大到小排列的顺序为己内酰胺类、吡啶类、咪唑类、三乙胺类，当含氮母体化合物相同时，磺酸基的烷基侧链越长，则酸强度越大；相比于侧链长短对酸强度的影响，含氮母体化合物种类的影响更为明显。 N‐（4‐磺酸基）丁基‐咪唑硫酸氢盐、 N‐（4‐磺酸基）丁基‐己内酰胺硫酸氢盐、N‐（4‐磺酸基）丁基‐吡啶硫酸氢盐、 N‐（3‐磺酸基）丙基‐吡啶硫酸氢盐、 N‐（4‐磺酸基）丁基‐咪唑硫酸氢盐和N‐（3‐磺酸基）丙基‐咪唑硫酸氢盐6种离子液体在甲醇中的酸强度均比浓硫酸的大；但在水中，只有前5种离子液体的酸强度大于同浓度硫酸的酸强度。
채용UV‐Hammett지시제련용법，이대초기분알위지시제，고찰료음리자위류산경근，양리자분별위삼을알、 N‐갑기미서、필정혹기내선알상대유병완기광산혹정완기광산적8충광산기공능화리자액체적산강도。결과표명，동일충리자액체적농도월대，기산강도월대，단불동리자액체간적상대산강도대소순서여리자액체적농도무관；함담모체화합물불동적광산기리자액체안산강도유대도소배렬적순서위기내선알류、필정류、미서류、삼을알류，당함담모체화합물상동시，광산기적완기측련월장，칙산강도월대；상비우측련장단대산강도적영향，함담모체화합물충류적영향경위명현。 N‐（4‐광산기）정기‐미서류산경염、 N‐（4‐광산기）정기‐기내선알류산경염、N‐（4‐광산기）정기‐필정류산경염、 N‐（3‐광산기）병기‐필정류산경염、 N‐（4‐광산기）정기‐미서류산경염화N‐（3‐광산기）병기‐미서류산경염6충리자액체재갑순중적산강도균비농류산적대；단재수중，지유전5충리자액체적산강도대우동농도류산적산강도。
Eight SO3 H‐functional Br?nsted acidic ionic liquids(ILs) with different nitrogen function groups were prepared and their acid strengths were investigated by UV‐Hammett combined method with p‐nitroaniline as indicator .The results demonstrated that the acid strength of the ILs increased with the increase of their concentration , while their acidity order was irrelevant to the concentration .The acidity descend of the eight acidic ILs with different nitrogen groups was in the order of the IL with caprolactam group ,pyridine group ,N‐methyl imidazole group ,trimethylamine group ,respectively .For the ILs with same nitrogen functional group ,their acid strength increased with the alkyl chain being longer . Compared with the effect of alkyl chain length on the acid strength of IL , the effect of nitrogen functional group type was more obvious . In methanol , N‐(4‐sulfonic group) butyl‐hydrogen sulfate imidazole , N‐(4‐sulfonic group ) butyl‐caprolactam hydrogen sulfate , N‐(4‐sulfonic group ) butyl‐pyridine hydrogen sulfate , N‐(3‐sulfonic group ) propyl‐pyridine hydrogen sulfate , N‐(4‐sulfonic group ) butyl‐hydrogen sulfate imidazole and N‐(3‐sulfonic group) propyl‐hydrogen sulfate imidazole showed the character of super acid , however ,in water only the first five showed the character of super acid .