Open-chain polyazaalkane ferrocene-functionalised receptors for the electrochemical recognition of anionic guests and metal ions in aqueous solution
作者:José Manuel Lloris、Ramón Martínez-Máñez、Miguel Padilla-Tosta、Teresa Pardo、Juan Soto Soto、María José L. Tendero
DOI:10.1039/a807058j
日期:——
New open-chain polyazaalkane N-terminal ferrocene-functionalised receptors, L1, L2 and L3, have been synthesized and characterised and their potential use as selective anion and cation sensing receptors in aqueous solution investigated. Solution studies by potentiometric methods have been carried out in the presence of H+ and Cu2+ in water (25 °C, 0.1 mol dm–3 KNO3). The results have been compared with those of the analogous non-functionalised receptors triethylenetetramine (L4), tetramethylenepentamine (L5) and N,N″‴-dimethylpentaethylenehexamine (L6). Compounds L1–L3 form both mono- and di-nuclear complexes with Cu2+. The electrochemical responses as a function of the pH in the presence of the Ni2+, Cu2+, Zn2+, Cd2+ or Pb2+ cations in water and the ATP, phosphate, sulfate and nitrate anions in thf–water (7∶3 v/v, 25 °C, 0.1 mol dm–3 [Bun4N][ClO4]) for L1, L2, L3 and for 1,4,7,10,13,16-hexaferrocenyl-1,4,7,10,13,16-hexaazacyclooctadecane (L7) in 1,4-dioxane–water (7∶3 v/v, 25 °C, 0.1 mol dm–3 KNO3) have also been determined. The studies have been directed to determine the pH ranges of selectivity in the electrochemical recognition of cations and anionic guests, pointing out the ability of molecules L1–L3 and L7 to act as selective anion-sensing or cation-sensing receptors. The anion ATP can be selectively detected using the L2 receptor in the presence of the competing anions phosphate and nitrate.
我们合成并表征了新型开链聚氮杂环烷 N 端
二茂铁功能化受体 L1、
L2 和 L3,并研究了它们在
水溶液中作为选择性阴离子和阳离子传感受体的潜在用途。在 H+ 和 Cu2+ 存在的
水溶液(25 °C,0.1 mol dm-3
KNO3)中,通过电位计方法进行了溶液研究。研究结果与类似的非官能化受体
三乙烯四胺(L4)、四甲基五胺(L5)和 N,N″‴-二甲基
五乙烯六胺(L6)进行了比较。化合物 L1-L3 与 Cu2+ 形成单核和双核络合物。在
水中含有 Ni2+、Cu2+、Zn2+、Cd2+ 或 Pb2+阳离子,以及在 thf-
水中含有
ATP、
磷酸盐、
硫酸盐和
硝酸盐阴离子(7∶3 v/v,25 °C,0.此外,还测定了 L1、
L2、L3 和
1,4-二氧六环-
水(7∶3 v/v,25 °C,0.1 mol dm-3 )中的 1,4,7,10,13,16-六亚
铁-
1,4,7,10,13,16-六氮杂环十八烷(L7)。这些研究旨在确定电
化学识别阳离子和阴离子客体的选择性 pH 值范围,指出分子 L1-L3 和 L7 具有作为选择性阴离子感应或阳离子感应受体的能力。在存在竞争阴离子
磷酸盐和
硝酸盐的情况下,可以使用
L2 受体选择性地检测阴离子
ATP。