摘要
设计并合成了含脲苯并咪唑鎓离子液体受体分子1~3,利用紫外-可见光谱、荧光光谱和1H NMR滴定研究了其对F-,Cl-,Br-,I-,CH3COO-,HSO4-,H2PO4-等阴离子的识别性能.紫外-可见光谱研究发现,受体分子1~3可选择性地识别F-,并形成1∶1型主客体配合物;荧光光谱研究发现,受体分子1~3对碱性阴离子有较好的识别作用,主客体结合常数的顺序为H2PO4->CH3COO-≈F->HSO4-≈Cl->Br-≈I-;1H NMR滴定研究发现,该类受体分子以咪唑2位CH和脲基NH与阴离子通过氢键结合,但高浓度的F-会导致受体分子发生脱质子作用.
Due to the fundamental roles that anions play in a wide range of chemical and biological processes, numerous efforts have been devoted to the design of receptors capable of selectively binding and sensing anions. Herein, three benzimidazolium-urea receptors were designed and synthesized. The interaction between these receptors and various anions(F-, CI-, Br-, I-, CH3COO-, HSO4-, HEPO4-) were studied by UV-Vis spectrum, fluorescence spectrum and ^1H NMR. The results demonstrate that the receptors and anions form 1 : 1 complex, and the receptors display a strong (C--H) + ... X-, N-H… X hydrogen bonds and charge- charge interactions in anion recognition.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第10期2256-2262,共7页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21072061)
上海市重点学科建设项目(批准号:B409)资助
关键词
苯并咪唑鎓
脲基
阴离子识别
离子液体
Benzimidazolium
Urea
Anion receptor
Anion recognition
Ionic liquid