Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, University of York, Heslington, York, YO10 5NY, UK.
Phys Chem Chem Phys. 2020 Mar 7;22(9):5033-5037. doi: 10.1039/c9cp06386b. Epub 2020 Feb 19.
A route to monitor the involvement of less abundant species during the catalytic transfer of hyperpolarisation from parahydrogen into a substrate is detailed. It involves probing how the degree of hyperpolarisation transfer catalysis is affected by the magnetic field experienced by the catalyst during this process as a function of temperature. The resulting data allow the ready differentiation of the roles played by hard to detect and highly reactive complexes, such as [Ir(H)(NHC)(substrate)(methanol)]Cl, from dominant species such as [Ir(H)(NHC)(substrate)]Cl. The difference in behaviour results from changes in the interligand spin-spin coupling network within the active SABRE catalysts.
详细介绍了一种监测催化转移过程中较少丰度物种参与情况的方法，该方法涉及到探测在这个过程中催化剂所经历的磁场如何影响极化转移催化的程度，作为温度的函数。所得数据可以很容易地区分难以检测和高反应性的配合物（如[Ir（H）（NHC）（底物）（甲醇）]Cl）与主导物种（如[Ir（H）（NHC）（底物）]Cl）的作用。这种行为上的差异源于活性 SABRE 催化剂中配体间自旋-自旋耦合网络的变化。
