Expanding the Ligand Classes Used for Mn(II) Complexation: Oxa-aza Macrocycles Make the Difference
作者:Ferenc K. Kálmán、Viktória Nagy、Rocío Uzal-Varela、Paulo Pérez-Lourido、David Esteban-Gómez、Zoltán Garda、Kristof Pota、Roland Mezei、Agnès Pallier、Éva Tóth、Carlos Platas-Iglesias、Gyula Tircsó
DOI:10.3390/molecules26061524
日期:——
relevant metal ions (Mg(II), Ca(II), Cu(II) and Zn(II)) were determined using potentiometric titrations (I = 0.15 M NaCl, T = 25 °C). The conditional stabilities of Mn(II) complexes at pH 7.4 are comparable to those reported for the cyclen-based tDO2A2−ligand. The dissociation of the Mn(II) chelates were investigated by evaluating the rate constants of metal exchange reactions with Cu(II) under acidic conditions
我们报告了两个基于1,7-diaza-12-crown-4平台的大环配体,该平台已被乙酸(t O2DO2A 2-)或哌啶乙酰胺(t O2DO2AM Pip)侧链官能化,并详细表征了相应的Mn(II)配合物。[Mn(t O2DO2A)(H 2 O)]·2H 2的X射线结构O表示金属离子由大环配体的六个供体原子和一个水分子配位,导致七配位。Cu(II)类似物呈现出扭曲的八面体配位环境。使用电位法确定了Mn(II)和其他生物相关金属离子(Mg(II),Ca(II),Cu(II)和Zn(II))形成的配体的质子化常数和配合物的稳定性常数滴定(I = 0.15 M NaCl,T = 25°C)。Mn(II)配合物在pH 7.4时的条件稳定性与基于环蛋白的t DO2A 2-配体所报道的条件稳定性相当。通过评估酸性条件下与Cu(II)的金属交换反应的速率常数来研究Mn(II)螯合物的解离(I = 0.15