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Synthesis,Characterization,and Complexation of Tetraarylborates with Aromatic Cations and Their Use in Chemical Sensors

机译:四芳基硼酸酯与芳香族阳离子的合成,表征和络合及其在化学传感器中的应用

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摘要

Five aromatic borate anions,namely tetrakis(4-phenoxyphenyl)bo-rate (1),tetrakis(biphenyl)borate (2),tetrakis(2-naphthyl)borate (3),tetra-kis(4-phenylphenol)borate (4),and tet-rakis(4-phenoxy)borate (5),have been prepared and tested as ion-recognition sites in chemical sensors for certain aromatic cations and metal ions.To gain further insight into the complexation of the cations,some complexes have been prepared and structurally characterized.The complexation behavior of 1 and 2 towards N-methylpyridinium (6),l-ethyl-4-(methoxycarbonyl)pyridinium (7),tropylium (8),imidazolium (9),and 1-methylimidazolium (10) cations has been studied,and the stability constants of the complexes of 1 with cations 6 and 8 have been measured to compare them with the values for the previously studied complexes of tetra-phenylborate.The structures of the borate anions and their complexes have been characterized by NMR and mass spectrometric methods.X-ray crystal structures have been determined for potassium tetrakis(4-phenoxyphenyl)borate (K~+-l),N-meth-ylpyridinium tetrakis(4-phenoxyphen-yl)borate (6centre dot1),l-ethyl-4-(methoxycar-bonyl)pyridinium tetrakis(4-phenoxy-phenyl)borate (7centre dot1),tropylium tetra-kis(4-phenoxyphenyl)borate (8centre dot1),and imidazolium tetrakis(biphenyl)borate (9centre dot2).The results show that borate derivatives are potential candidates for a completely new family of charged carriers for use in cation-selective electrodes.
机译:五种芳香族硼酸根阴离子,即四(4-苯氧基苯基)硼酸根(1),四(联苯)硼酸根(2),四(2-萘基)硼酸根(3),四(4-苯基苯酚)硼酸根(4) )和tet-rakis(4-苯氧基)硼酸酯(5)已被制备并作为化学传感器中某些芳香族阳离子和金属离子的离子识别位点进行测试。为了进一步了解阳离子的络合物,一些络合物1和2对N-甲基吡啶鎓(6),1-乙基-4-(甲氧基羰基)吡啶鎓(7),对甲苯铵(8),咪唑鎓(9)和1-甲基咪唑鎓的络合行为(10)研究了阳离子,并测量了1与阳离子6和8的配合物的稳定性常数,以将其与先前研究的四苯基硼酸酯的配合物的值进行比较。硼酸根阴离子及其配合物的结构通过NMR和质谱法进行了表征。已确定了钾的X射线晶体结构四(4-苯氧基苯基)硼酸酯(K〜-1),N-甲基-吡啶基四(4-苯氧基苯基)硼酸酯(6centdot1),1-乙基-4-(甲氧基羰基)吡啶四(4-环氧基)吡啶鎓苯氧基-苯基)硼酸盐(7中心点1),四乙基(4-苯氧基苯基)硼酸对乙铵(8中心点1)和四(联苯)硼酸咪唑鎓(9中心点2)。系列用于阳离子选择电极的带电载流子。

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