Exploiting the Fluxionality of Lanthanide Complexes in the Design of Paramagnetic Fluorine Probes
作者:Randall K. Wilharm、Mandapati V. Ramakrishnam Raju、John C. Hoefler、Carlos Platas-Iglesias、Valérie C. Pierre
DOI:10.1021/acs.inorgchem.1c03908
日期:2022.3.7
increasing the number of fluorinenuclei per probe as well as decreasing their longitudinal relaxation time. The latter is easily achieved by positioning the fluorine atoms in close proximity to a paramagnetic metal ion such as a lanthanide(III). Increasing the number of fluorine atoms per molecule, however, is only useful inasmuch as all of the fluorinenuclei are chemically equivalent. Previous attempts
Fluorine-19 MRI 越来越多地被视为生物分子成像的工具,但这种技术的灵敏度非常低,限制了大多数应用。以前的研究早已确定,提高19的敏感性F 分子探针需要增加每个探针的氟原子核数量并减少它们的纵向弛豫时间。后者很容易通过将氟原子放置在靠近顺磁性金属离子(例如镧系元素(III))的位置来实现。然而,增加每个分子的氟原子数仅在所有氟原子核化学等效时才有用。以前实现这种等效性的尝试主要集中在设计高度对称和刚性的氟化大环配体。一种更简单的方法包括利用具有开放配位点的高度流动的镧系元素配合物,这些配位点对磷酸化和膦酸化物质具有高亲和力。计算研究表明,Ln III-TREN-MAM 具有高度流动性,可在至少六种不同的异构体之间快速相互转化。在室温下的中性水中,Ln III -TREN-MAM 结合两个或三个当量的氟化膦酸盐。19 F 原子核与三元复合物中 Ln III中心的紧密接近将氟原子核的弛豫时间减少了多达
CHELATING AGENTS
申请人:Wadsworth Harry John
公开号:US20100056787A1
公开(公告)日:2010-03-04
The present invention relates to chelating agents, in particular to chelating agents which are capable of forming complexes with paramagnetic metal ions such as iron (III) and gadolinium (III). The invention also relates to the complexes formed and their use as MRI contrast agents.
[EN] The present invention relates to chelating agents, in particular to chelating agents which are capable of forming complexes with paramagnetic metal ions such as iron (III) and gadolinium (III). The invention also relates to the complexes formed and their use as MRI contrast agents. [FR] La présente invention porte sur des agents chélatants, en particulier sur des agents chélatants qui peuvent former des complexes avec des ions métalliques paramagnétiques tels que le fer (III) et le gadalinium (III). L'invention porte également sur les complexes formés et leur utilisation comme agents de contraste en IRM.