Ratiometric quantitation of redox status with a molecular Fe<sub>2</sub> magnetic resonance probe
作者:Kang Du、Emily A. Waters、T. David Harris
DOI:10.1039/c7sc00562h
日期:——
sharp, and non-overlapping NMR spectra, with multiple resonances for each complex corresponding to exchangeable carboxamide protons. These protons can be selectively irradiated to give CEST peaks at 74 and 83 ppm vs H2O for the FeIIFeIII complex and at 29, 40 and 68 ppm for the FeII2 complex. The CEST spectra obtained from a series of samples containing mixtures of FeII2 and FeIIFeIII are correlated with
我们证明了分子 Fe 2络合物能够实现基于磁共振 (MR) 的氧化还原状态比率定量,即通过氧化还原依赖性顺磁化学交换饱和转移 (PARACEST)。在依替磷酸盐离子存在下,四(甲酰胺)配体与Fe II和/或Fe III的金属化提供了类似的Fe II 2、Fe II Fe III和Fe III 2络合物。Fe II 2和 Fe II Fe III配合物均提供高度位移、尖锐且不重叠的 NMR 谱,每个配合物具有对应于可交换羧酰胺质子的多个共振。可以选择性地照射这些质子,以给出Fe II Fe III络合物相对于 H 2 O 74 和 83 ppm 处的 CEST 峰,以及 Fe II 2络合物在 29、40 和 68 ppm 处的CEST 峰。从一系列含有 Fe II 2和 Fe II Fe III混合物的样品中获得的 CEST 光谱与独立确定的开路电势相关,以构建电势与 CEST 峰强度比的能斯特校准曲线。此外,在
Outer-sphere electron transfer reactions of aqua(5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane-1-acetato) nickel(II) and (III).
作者:Robert I Haines、Dean R Hutchings
DOI:10.1139/v03-017
日期:2003.2.1
[Ni(tacn)2]3+ + [NiL1(OH2)]+ [Ni(tacn)2]2+ + [NiL1(OH2)]2+ The kinetics show the forward reaction to be acid dependent, a feature that is attributed to protonation of the acetato group of the nickel(II) complex. UsingMarcus theory, the self-exchangerate for the [NiL1(OH2)]+/2+ couple has been calculated. The nickel(II/III) electron transfer is a reversible one electron process with E° = 1.04 V (vs. S.H
去质子化悬臂大环的镍 (II) 配合物的外球氧化,5,5,7,12,12,14-六甲基-1,4,8,11-四氮杂环十四烷-1-乙酸盐,[NiL1 (OH2)]+ 由双-(1,4,7-三氮杂环壬烷)镍 (III)、[Ni(tacn)2]3+ 在水性高氯酸盐介质中进行了研究。该反应显示可逆的二级行为,动力学研究揭示了反应的正向和反向速率常数:[Ni(tacn)2]3+ + [NiL1(OH2)]+ [Ni(tacn)2]2+ + [NiL1(OH2)]2+ 动力学表明正向反应依赖于酸,这一特征归因于镍 (II) 配合物的乙酰基团的质子化。使用 Marcus 理论,计算了 [NiL1(OH2)]+/2+ 对的自交换率。镍 (II/III) 电子转移是一种可逆的单电子过程,E° = 1.04 V(相对于 SHE)。esr 光谱证实了真正的镍 (III) 产品的形成。Fe2+(aq) 对 [NiL1(OH2)]2+
Micellar inhibition of the aquation of tris-(3,4,7,8-tetramethyl-1,10-phenanthroline)iron(II) by sodium dodecyl sulphate in aqueous acid medium
作者:Jide Ige、O. Soriyan
DOI:10.1039/f19868202011
日期:——
The inhibition of the aquation of Fe(Me4phen)2+3 by sodiumdodecylsulphate (SDS) in aqueousacid media has been investigated and a mechanism which explains the pronounced inhibition and pre-micellar activity at low [SDS]T has been proposed. Inhibition is due to favourable thermodynamic-/hydrophobic/electrostatic binding between the FeII complex and SDS monomer aggregates. The bound FeII complex is