...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Solution properties of the Ln ~(III) complexes of a novel octadentate chelator with rigidified iminodiacetate arms
【24h】

Solution properties of the Ln ~(III) complexes of a novel octadentate chelator with rigidified iminodiacetate arms

机译：具有刚性亚氨基二乙酸酯臂的新型八齿螯合剂的Ln〜（III）配合物的溶液性质

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A novel octadentate ligand derived from the core structure of EGTA (ethyleneglycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid) with two piperidine-cis-dicarboxylic acid moieties spaced by a triethylenedioxy chain (L1) has been synthesised with the aim to assess the effect of the structural rigidity on the thermodynamic and kinetic stabilities of its Ln ~(III) complexes. The stability constants of [Ln(L1)] ~- complexes show a weaker binding affinity for Ln ~(3+) ions of L1 than EGTA. On the other hand, the selectivity of L1 for Ca ~(2+) over Mg ~(2+) is one of the highest ever reported. The kinetic inertness has been also investigated and faster rates of both acid catalysed and metal assisted decomplexation have been measured for [Gd(L1)] ~- as compared to [Gd(EGTA)] ~-. The ~1H- and ~(13)C NMR spectra of the diamagnetic La ~(3+), Y ~(3+) and Lu ~(3+) complexes in aqueous media show pronounced stereochemical rigidity and the occurrence of a structural change across the lanthanide series. Finally, a complete ~1H and ~(17)O NMR relaxometric study indicates that [Gd(L1)] ~- possesses a nine-coordinate ground state with one inner coordination sphere water molecule characterized by a fast rate of exchange (~(298)k _(ex) = 59 × 10 ~6 s ~(-1)).
机译：源自EGTA的核心结构的新八齿配体（乙二醇-双（2-氨基乙基醚）-N，N，N'，N'-四乙酸），两个哌啶-顺式-二羧酸部分以三亚乙基二氧基链隔开（L1为了评估结构刚度对其Ln〜（III）配合物的热力学和动力学稳定性的影响，已经合成了）。 [Ln（L1）]〜-络合物的稳定性常数显示对L1的Ln〜（3+）离子的结合亲和力比EGTA弱。另一方面，L1对Ca〜（2+）相对于Mg〜（2+）的选择性是有史以来最高的。还已经研究了动力学惰性，并且与[Gd（EGTA）]-相比，[Gd（L1）]-的酸催化和金属辅助分解的速率都更快。水性介质中反磁性La〜（3 +），Y〜（3+）和Lu〜（3+）配合物的〜1H-和〜（13）C NMR光谱显示出明显的立体化学刚度和结构变化的发生跨越镧系。最后，完整的〜1H和〜（17）O NMR弛豫研究表明[Gd（L1）]〜-具有九坐标基态和一个内部配位球水分子，其特征在于交换速度快（〜（298 ）k _（ex）= 59×10〜6 s〜（-1））。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号