METAL ION COMPLEXATION

这项研究的目的是定量地确定 三价镧系元素的配位和络合性质 阳离子，以及这些信息随后在研究中的应用 这些离子中具有重要生理作用的配位体。镧系元素 被广泛用作相互作用位点确定的结合剂 作为金属酶和其他物质中的探针取代基的生物配体 需要金属离子进行活性的体系，作为松弛剂 磁共振成像，作为核磁共振化学位移试剂，以及作为 许多工业过程中的组件。政府当局所要求的资料 建议的实验包括在我们的 测量条件.如有偏差，则测定 通过镧系元素的这个值；内壳层的存在 络合及其对阴离子和溶剂性质的依赖；程度 竞争溶剂化及其对配基性质的依赖； 所有情况下，对物种结构的定量测定 在溶液中。这些信息将为 四种主要脱氧核糖核酸及其相互作用的配位研究 组成分子作为初始配体的基团。 将使用的实验技术允许直接观察 初级阳离子溶剂化壳组分的核磁共振信号， 具体地说，溶剂配体，AN离子，在某些体系中， 抗磁性金属离子本身。反过来，这些观察结果又导致了 镧系元素配位性能的定量评价 如上所述。测量将使用布鲁克AM-400进行 多核超导傅里叶变换核磁共振波谱仪。 根据盐和溶剂系统的不同，化学位移、面积和 将应用的线宽技术将涉及1H、13C、15N、31P、 35Cl、81Br、127I，以及可能的抗磁性金属离子核。

The objectives of this research are the quantitative determination of the coordination and complexing properties of the trivalent lanthanide cations, and the subsequent application of this information to the study of these ions with ligands of physiological importance. The lanthanides are used extensively as binding agents for interaction site determinations of biological ligands, as probe substituents in metalloenzymes and other systems requiring a metal-ion for activity, as relaxation agents in magnetic resonance imaging, as NMR chemical shift reagents, and as components in numerous industrial processes. The information sought by the proposed experiments includes the maximum coordination number at our conditions of measurement; the determination of variations, if any, of this value through the lanthanide series; the presence of inner-shell complexing and its dependence on anion and solvent properties; the extent of competitive solvation and its dependence on ligand properties; and in all cases, the quantitative determination of the structures of the species in solution. This information will provide a solid framework for the coordination study of four principal deoxyribonucleotides and their component molecules as an initial group of ligands. The experimental techniques to be used permit the direct observation of NMR signals for the components of the primary cation solvation shell, specifically solvent ligands, an ions, and in some systems, the diamagnetic metal-ion itself. In turn, these observations lead to the quantitative evaluation of the lanthanide coordination properties mentioned above. The measurements will be made using a Bruker AM-400 multinuclear, superconducting, Fourier transform NMR spectrometer. Depending on the salt and solvent system, the chemical shift, area, and linewidth techniques to be applied will involve the 1H, 13C, 15N, 31P, 35Cl, 81Br, 127I, and diamagnetic metal-ion nuclei where possible.