Abstract
Immobilized rhodium and iridium complexes have been prepared and characterized by X-ray photoelectron spectroscopy. For the first time, hyperpolarized 13C-ethylene was detected directly in the gas phase during acetylene hydrogenation with parahydrogen over immobilized iridium complexes. The line shape of polarized 13С‑ethylene unambiguously indicates that the hydrogen addition to the triple bond of acetylene over immobilized iridium complexes proceeds stereoselectively via syn-addition. It has been shown that the selective acetylene hydrogenation with parahydrogen over immobilized iridium complexes is an efficient chemical method for enriching the nuclear spin isomers of ethylene.
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ACKNOWLEDGMENTS
L.M.K., A.V.N., R.I.K., and V.I.B. express gratitude to Boreskov Institute of Catalysis SB RAS for the opportunity to study the synthesized catalysts using XPS. I.V.S., S.V.S., D.B.B., and I.V.K. thank the Ministry of Science and Higher Education of the Russian Federation for access to the NMR spectrometer.
Funding
The development of methods for the synthesis of the described catalysts, as well as their studies by XPS, was carried out with the financial support of the Russian Science Foundation (project no. 19-13-00172-P).
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Dedicated to the Anniversary of Academician Irina Petrovna Beletskaya
Translated by G. Kirakosyan
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Skovpin, I.V., Sviyazov, S.V., Burueva, D.B. et al. Nonequilibrium Nuclear Spin States of Ethylene during Acetylene Hydrogenation with Parahydrogen over Immobilized Iridium Complexes. Dokl Phys Chem 512, 149–157 (2023). https://doi.org/10.1134/S0012501623600237
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DOI: https://doi.org/10.1134/S0012501623600237