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Synthesis, characterisation and ion-binding properties of oxathiacrown ethers appended to [Ru(bpy)2]2+. Selectivity towards Hg2+, Cd2+ and Pb2+†
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1039/c7ra13589k
Ruth A Odhiambo 1, 2 , Austin O Aluoch 3 , Lydia W Njenga 1 , Stanley M Kagwanja 4 , Shem O Wandiga 1 , Ola F Wendt 2
Affiliation  

A series of complexes with oxathiacrown ethers appended to a [Ru(bpy)2]2+ moiety have been synthesized and characterised using 1H NMR, 13C NMR, IR, electronic absorption and emission spectroscopies, mass spectrometry and elemental analyses. The complexes exhibit strong MLCT luminescence bands in the range 608–611 nm and one reversible metal centred oxidation potential in the range 1.00–1.02 V. Their selectivity and sensitivity towards Hg2+, Cd2+ and Pb2+ metal ions have been investigated using electronic absorption, luminescence, cyclic and differential pulse voltammetry titrations. Their responses towards selected cations and anions have also been investigated using electronic absorption and luminescence. While the complexes are selective towards Hg2+ and Cd2+ ions, none of them is selective towards Pb2+ ions. In particular, complex 2 gives a selective change in the UV/Vis absorbance with Hg2+ making it possible to detect mercury down to a detection limit of 68 ppm. The binding constants and limits of detection of the complexes have been calculated, with values ranging from 4.37 to 5.38 and 1.4 × 10−3 to 6.8 × 10−5 for log Ks and LOD respectively.

中文翻译:

[Ru(bpy)2]2+ 上的氧杂噻吩醚的合成、表征和离子结合特性。对 Hg2+、Cd2+ 和 Pb2+ 的选择性†

使用1 H NMR、13 C NMR、IR、电子吸收和发射光谱、质谱和元素分析,合成了一系列与附加到 [Ru(bpy) 2 ] 2+部分的氧杂噻吩醚配合物并进行了表征。该配合物在 608-611 nm 范围内表现出强 MLCT 发光带和在 1.00-1.02 V 范围内的一种可逆金属中心氧化电位。它们对 Hg 2+、Cd 2+和 Pb 2+的选择性和灵敏度已经使用电子吸收、发光、循环和差分脉冲伏安滴定法研究了金属离子。还使用电子吸收和发光研究了它们对选定的阳离子和阴离子的反应。虽然这些配合物对 Hg 2+和 Cd 2+离子具有选择性,但它们都对 Pb 2+离子没有选择性。特别是,配合物2可以选择性地改变 Hg 2+的 UV/Vis 吸光度,从而可以检测低至 68 ppm 检测限的汞。计算了复合物的结合常数和检测限,值范围为 4.37 至 5.38 和 1.4 × 10 -3至 6.8 × 10 -5分别为 log  K s和 LOD。
更新日期:2018-01-17
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