Molecular Recognition of Sialic Acid by Lanthanide(III) Complexes through Cooperative Two-Site Binding
作者:Martín Regueiro-Figueroa、Kristina Djanashvili、David Esteban-Gómez、Thomas Chauvin、Éva Tóth、Andrés de Blas、Teresa Rodríguez-Blas、Carlos Platas-Iglesias
DOI:10.1021/ic902461g
日期:2010.5.3
relaxation dispersion profiles recorded for [Gd(L1)] and [Gd(L2)] confirm that the phenylboronate function is coordinated to the metal ion in the L1 derivative, which results in a q = 0 complex. The interaction of the [Gd(L2)] complex with 5-acetylneuraminic acid (Neu5Ac) and 2-α-O-methyl-5-acetylneuraminic acid (MeNeu5Ac) has been investigated by means of spectrophotometric titrations in an aqueous solution
在本文中,我们报告了两个新的配体,1,4,7-三(羧甲基)-10- [2-(二羟基硼烷基)苄基] -1,4,7,10-四氮杂环十二烷(L 1)和1,4,7-三(羧甲基)-10- [3-(二羟基硼烷基)苄基] -1,4,7,10-四氮杂环十二烷(L 2),含有苯基硼酸(PBA)功能和1,4,7,10-四氮杂环十二烷- 1,4,7-三乙酸酯笼,用于在水溶液中络合镧系元素离子。在p ķ一个的PBA函数量,以4.6 [钆(L的1)]和8.9在[钆(L 2)],与L的值2类似物是非常相似的PBA的(8.8)。通过将L 1的PBA功能与Gd III协调来解释这些结果。离子,导致其p K a急剧降低。结果,[Gd(L 1)]在生理pH下不与糖结合。记录的[Gd(L 1)]和[Gd(L 2)]的核磁弛豫分布图证实,苯基硼酸酯官能团与L 1衍生物中的金属离子配位,从而形成q = 0的络合物。[Gd(L 2)