吖啶-苯并咪唑环番化合物在检测H_(2)PO_(4)^(-)中的应用  

Application of Aridine-Benzimidazolium Cyclophane in the Detection of H_(2)PO_(4)^(-)

作　　者：董智云 韩喜龙 王迎进[1] 席福贵 DONG Zhi-yun;HAN Xi-long;WANG Ying-jin;XI Fu-gui(Department of Chemistry,Xinzhou Teachers University,Xinzhou 034000,China)

机构地区：[1]忻州师范学院化学系,山西忻州034000

出　　处：《化学试剂》2021年第5期692-697,共6页Chemical Reagents

基　　金：国家自然科学基金资助项目(21701137);山西省高等学校科技创新项目(2019L0827)。

摘　　要：以一种吖啶-苯并咪唑环番化合物L为荧光传感器,在化合物L的V(乙腈)∶V(水)=95∶5溶液中加入H_(2)PO_(4)^(-)后导致荧光发射峰(E_(m)=426 nm)猝灭,检出限为4.75×10^(-7) mol/L,Job曲线显示化合物L和H_(2)PO_(4)^(-)离子之间以1∶1化学计量比结合,结合常数为(6.96±0.44)×10^(4) L/mol。在波长为365 nm紫外灯照射下,化合物L发出明显的蓝绿色荧光,而L-H_(2)PO_(4)^(-)配合物呈现较弱的蓝色荧光,可实现固态检测H_(2)PO_(4)^(-)阴离子。DFT计算显示化合物L通过苯并咪唑2位H与H_(2)PO_(4)^(-)离子之间形成了非常强的离子型氢键。An aridine-benzimidazolium cyclophane L was used as a fluorescent sensor, displayed excellent sensitivity specific toward H_(2)PO_(4)^(-).The fluorescence emission peak at 426 nm was quenched when H_(2)PO_(4)^(-) was added to the V(CH_(3)CN)∶V(H_(2)O)=95∶5 solution of sensor L and the detection limit was 4.75×10^(-7) mol/L.The 1∶1 stoichiometry was verified by Job plot, and the association constant was obtained to be(6.96±0.44)×10^(4) L/mol.The sensor L emitted obvious blue-green fluorescence by the naked eye under UV lamp irradiation at 365 nm, while the complex of L-H_(2)PO_(4)^(-) exhibited weaker blue fluorescence, which could realize recognition of H_(2)PO_(4)^(-) anions on solid-state.DFT showed that H_(2)PO_(4)^(-) located up the cave of compound L and formed hydrogen bond with the C_(2)—H proton of benzimidazoliums.

关 键 词：吖啶 环番化合物 苯并咪唑 H_(2)PO_(4)^(-) 荧光传感器 

分 类 号：O626.1[理学—有机化学]