Chemical speciation of copper(<scp>ii</scp>) diaminediamide derivative of pentacycloundecane—a potential anti-inflammatory agent
作者:Sebusi Odisitse、Graham E. Jackson、Thavendran Govender、Hendrik G. Kruger、Amith Singh
DOI:10.1039/b614878f
日期:——
Formation constants of copper(II), zinc(II) and calcium(II) with 3,5-diaminodiamido-4-oxahexacyclododecane (cageL) has been studied by glass electrode potentiometry at 25 °C and an ionic strength of 0.15 mol dmâ3. Copper(II) forms more stable complexes with cageL than zinc(II) and calcium(II). Metal ion complexation promotes deprotonation and coordination of the amide nitrogens resulting in overall tetragonal coordination of Cu2+ suggested by the UV-visible electronic spectra. Speciation calculations using a blood plasma model suggest that zinc(II) and calcium(II) are good competitors of copper(II) in vivo. Bio-distribution experiments using 64Cu-labelled Cu(II)-cageL show that about 50% dose of the complex is retained in the body after 24 h.
在 25 °C 和 0.15 mol dmâ 离子强度下,通过玻璃电极电位法研究了铜 (II)、锌 (II) 和钙 (II) 与 3,5-二氨基二氨基-4-氧杂六环十二烷 (cageL) 的形成常数。 3.铜(II) 与cageL 形成比锌(II) 和钙(II) 更稳定的络合物。金属离子络合促进酰胺氮的去质子化和配位,从而导致 Cu2+ 的整体四方配位(紫外-可见电子光谱表明)。使用血浆模型进行的形态计算表明,锌 (II) 和钙 (II) 是体内铜 (II) 的良好竞争者。使用 64Cu 标记的 Cu(II)-cageL 进行的生物分布实验表明,24 小时后约 50% 剂量的复合物保留在体内。