Perbrominated closo-dodecacarborane anion, 1-HCB11Br11-, as an ion exchanger in cation-selective chemical sensors.
Perbrominated closo-dodecacarborane anion, 1-HCB11Br11-, as an ion exchanger in cation-selective chemical sensors.
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DOI：
10.1021/ac0156262
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发表时间：
2002-02
影响因子：
7.4
通讯作者：
S. Peper;M. Telting-Diaz;P. Almond;T. Albrecht‐Schmitt;E. Bakker
中科院分区：
文献类型：
--
作者：
S. Peper;M. Telting-Diaz;P. Almond;T. Albrecht‐Schmitt;E. Bakker
已经评价了2，3，4，5，6，7，8，9，10，11，12-十一溴碳硼烷阴离子1-HCB 11Br 11-（UBC-）作为溶剂聚合物膜电极和本体光极中的离子交换剂的适用性。将全卤代碳硼烷阴离子的化学稳定性与最好的亲脂性四苯基硼酸盐3，5-[双（三氟甲基）苯基]硼酸盐（TFPB-）的化学稳定性进行比较的实验表明，在0.2M乙酸的存在下，TFPB-在6小时内完全丧失，而UBC-的浓度在同一时间段内降低小于10%。含有BME-44作为钾选择性离子载体、ETH 5294作为色离子载体和UBC-作为离子位点的薄膜本体光极表现出与含有TFPB-的类似光极类似的K+响应，对Na+和Ca 2+具有可比的选择性。电位测量评估的选择性行为的UBC-在这两个离子载体的自由和含离子载体的电极进行。含有UBC-作为离子交换剂和DOS或NPOE作为增塑剂的不含离子载体的PVC膜也表现出类似于含有TFPB-的膜的选择性。含有离子载体4-叔丁基杯[4]芳烃四乙酸四乙酯（钠离子载体X）和UBC-作为离子位点的钠选择性膜显示出对钠的能斯特响应和与含有TFPB-的类似电极中发现的选择性相当。
The 2,3,4,5,6,7,8,9,10,1 1,12-undecabromocarborane anion, 1-HCB11Br11- (UBC-) has been evaluated for its suitability as an ion exchanger in solvent polymeric membrane electrodes and bulk optodes. Experiments comparing the chemical stability of the perhalogenated carborane anion to that of the best lipophilic tetraphenylborate, 3,5-[bis(trifluoromethyl)phenyl]borate (TFPB-), demonstrated that in the presence of 0.2 M acetic acid TFPB- was completely lost within 6 h, while the concentration of UBC- decreased by less than 10% in the same time period. Thin-film bulk optodes containing BME-44 as potassium-selective ionophore, ETH 5294 as chromo-ionophore, and UBC- as ionic sites exhibited a K+ response similar to analogous optodes containing TFPB-, with comparable selectivities over Na+ and Ca2+. Potentiometric measurements evaluating the selectivity behavior of UBC- in both ionophore-free and ionophore-containing electrodes were performed. Ionophore-free PVC membranes containing UBC- as ion exchanger and either DOS or NPOE as plasticizer also demonstrated selectivity similar to TFPB--containing membranes. Sodium-selective membranes containing the ionophore 4-tert-butylcalix[4]arenetetraacetic acid tetraethyl ester (sodium ionophore X) and UBC- as ionic sites showed a Nernstian response for sodium and selectivity comparable to that found in analogous electrodes containing TFPB-.