Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 123, Issue 26, Pages 16288-16293Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b04179
Keywords
-
Funding
- Deutsche Forschungsgemeinschaft DFG [Bu-911-29-1]
- Russian Science Foundation [19-43-04116]
- state of Hesse
- Russian Science Foundation [19-43-04116] Funding Source: Russian Science Foundation
Ask authors/readers for more resources
For the first time, chemical exchange saturation transfer (CEST) nuclear magnetic resonance (NMR) is utilized to study short-lived hydride intermediates in the catalytic cycle of an organometallic complex [Ir(IMes)(Py)(3)(H)(2)]Cl. These complexes are typically not observable by other NMR techniques because they are low concentrated and undergo reversible ligand exchange with the main complex. The intermediate complexes [Ir(Cl)(IMes)(Py)(2)(H)(2)] and [Ir(CD3OD)(IMes)(Py)(2)(H)(2)] are detected, assigned, and characterized in solution, in situ and at room temperature. Understanding the spin dynamics in these complexes is necessary for enhancing the performance of the nuclear spin hyperpolarization technique signal amplification by reversible exchange. By eliminating [Ir(CI)(IMes)(Py)(2)(H)(2)] and manipulating the spin system by radiofrequency irradiation, the nuclear spin singlet lifetime of the hydride protons was increased by more than an order of magnitude, from 2.2 +/- 0.1 to 27.2 +/- 1.2 s. Because of its simplicity and ability to unravel unobservable chemical species, the utilized CEST NMR approach has a large application potential for studying short-lived hydride intermediates in catalytic reactions.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available