Swift and efficient nuclear spin conversion of molecular hydrogen confined in Prussian blue analogs

Yuta Ohtsubo; Akio Mishima; Akihiro Hori; Ryotaro Matsuda; Ryo Ohtani; Masaaki Ohba

doi:10.1246/cl.190829

Swift and efficient nuclear spin conversion of molecular hydrogen confined in Prussian blue analogs

Yuta Ohtsubo, Akio Mishima, Akihiro Hori, Ryotaro Matsuda, Ryo Ohtani, Masaaki Ohba

Inorganic and Analytical Chemistry

Research output: Contribution to journal › Article › peer-review

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Abstract

The ortho-isomer of molecular hydrogen (o-H₂) was converted to the para-isomer (p-H₂) within 600 s by using Prussian blue analogs, {M^II ₃[Cr^III(CN)₆]₂} (MCr; M = Mn and Ni), as nuclear-spin conversion catalysts. The swift conversion was confirmed by in-situ Raman micro-spectroscopy under an H₂ gas atmosphere (100 kPa) in a low temperature range (2090 K). The o-p ratio observed in MCr deviated from the theoretical value based on the Boltzmann distribution of H₂ in a free rotational state to the para-rich proportion, which suggested the promotion of the o-p conversion at higher temperature.

Original language	English
Pages (from-to)	149-152
Number of pages	4
Journal	Chemistry Letters
Volume	49
Issue number	2
DOIs	https://doi.org/10.1246/cl.190829
Publication status	Published - 2020

All Science Journal Classification (ASJC) codes

Chemistry(all)

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10.1246/cl.190829

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@article{09a71511e24c47fa9e6b6e076ab2f658,

title = "Swift and efficient nuclear spin conversion of molecular hydrogen confined in Prussian blue analogs",

abstract = "The ortho-isomer of molecular hydrogen (o-H2) was converted to the para-isomer (p-H2) within 600 s by using Prussian blue analogs, {MII 3[CrIII(CN)6]2} (MCr; M = Mn and Ni), as nuclear-spin conversion catalysts. The swift conversion was confirmed by in-situ Raman micro-spectroscopy under an H2 gas atmosphere (100 kPa) in a low temperature range (2090 K). The o-p ratio observed in MCr deviated from the theoretical value based on the Boltzmann distribution of H2 in a free rotational state to the para-rich proportion, which suggested the promotion of the o-p conversion at higher temperature.",

author = "Yuta Ohtsubo and Akio Mishima and Akihiro Hori and Ryotaro Matsuda and Ryo Ohtani and Masaaki Ohba",

note = "Funding Information: This work was supported by JSPS KAKENHI Grant Number of 16H06519 (Coordination Asymmetry) and 18H01997, and RIKEN Quantum Ordering project. We would like to thank Editage (www.editage.com) for English language editing.",

year = "2020",

doi = "10.1246/cl.190829",

language = "English",

volume = "49",

pages = "149--152",

journal = "Chemistry Letters",

issn = "0366-7022",

publisher = "The Chemical Society of Japan",

number = "2",

}

TY - JOUR

T1 - Swift and efficient nuclear spin conversion of molecular hydrogen confined in Prussian blue analogs

AU - Ohtsubo, Yuta

AU - Mishima, Akio

AU - Hori, Akihiro

AU - Matsuda, Ryotaro

AU - Ohtani, Ryo

AU - Ohba, Masaaki

N1 - Funding Information: This work was supported by JSPS KAKENHI Grant Number of 16H06519 (Coordination Asymmetry) and 18H01997, and RIKEN Quantum Ordering project. We would like to thank Editage (www.editage.com) for English language editing.

PY - 2020

Y1 - 2020

N2 - The ortho-isomer of molecular hydrogen (o-H2) was converted to the para-isomer (p-H2) within 600 s by using Prussian blue analogs, {MII 3[CrIII(CN)6]2} (MCr; M = Mn and Ni), as nuclear-spin conversion catalysts. The swift conversion was confirmed by in-situ Raman micro-spectroscopy under an H2 gas atmosphere (100 kPa) in a low temperature range (2090 K). The o-p ratio observed in MCr deviated from the theoretical value based on the Boltzmann distribution of H2 in a free rotational state to the para-rich proportion, which suggested the promotion of the o-p conversion at higher temperature.

AB - The ortho-isomer of molecular hydrogen (o-H2) was converted to the para-isomer (p-H2) within 600 s by using Prussian blue analogs, {MII 3[CrIII(CN)6]2} (MCr; M = Mn and Ni), as nuclear-spin conversion catalysts. The swift conversion was confirmed by in-situ Raman micro-spectroscopy under an H2 gas atmosphere (100 kPa) in a low temperature range (2090 K). The o-p ratio observed in MCr deviated from the theoretical value based on the Boltzmann distribution of H2 in a free rotational state to the para-rich proportion, which suggested the promotion of the o-p conversion at higher temperature.

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U2 - 10.1246/cl.190829

DO - 10.1246/cl.190829

M3 - Article

AN - SCOPUS:85079686891

SN - 0366-7022

VL - 49

SP - 149

EP - 152

JO - Chemistry Letters

JF - Chemistry Letters

IS - 2

ER -

Swift and efficient nuclear spin conversion of molecular hydrogen confined in Prussian blue analogs

Abstract

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