Derivatives of cyclam-1,8-diacetic acid: Synthesis and complexes with divalent transition metal ions
作者:Milan Maďar、Lucie Koláčná、Filip Koucký、Jana Havlíčková、Juraj Kuchár、Jan Kotek、Vojtěch Kubíček、Jiří Ludvík、Petr Hermann
DOI:10.1016/j.jorganchem.2023.122641
日期:2023.4
were synthesized and their complexes were studied. Series of CoII and ZnII complexes was prepared in the solid-state and X-ray diffraction analysis showed that the metal ions are hexacoordinated by four nitrogen atoms of the macrocycle and two oxygen atoms of the carboxylate pendants. The two oxygen atoms were in cis and trans mutual position in the CoII and ZnII complexes, respectively. Potentiometric
合成了1,4,8,11-四氮杂环十四烷-1,8-二乙酸、H 2 te2a及其一系列带有两个取代N-苄基的衍生物,并研究了它们的配合物。在固态和X射线衍射分析中制备了一系列Co II和Zn II配合物,表明金属离子由大环的四个氮原子和羧酸根侧链的两个氧原子六配位。两个氧原子分别在 Co II和 Zn II配合物中处于顺式和反式相互位置。Co II , Zn II , Cu II的电位研究和 Ni II -H 2 te2a 系统显示该配合物具有高度热力学稳定性,配体对 Cu II离子 (log K = 27.5) 的选择性优于其他离子 (log K = 21–22)。Co II -H 2 te2a 系统的 UV-VIS 和电化学数据表明,络合相当缓慢(在 pH 4.5、25 °C 下需要数小时),并且络合物会被空气中的氧气缓慢氧化。