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Spontaneous 15N Nuclear Spin Hyperpolarization in Metal-Free Activation of Parahydrogen by Molecular Tweezers. / Sorochkina, Kristina; Zhivonitko, Vladimir V.; Chernichenko, Konstantin et al.

In: Journal of Physical Chemistry Letters, Vol. 9, No. 4, 15.02.2018, p. 903-907.

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

Harvard

Sorochkina, K, Zhivonitko, VV, Chernichenko, K, Telkki, VV, Repo, T & Koptyug, IV 2018, 'Spontaneous 15N Nuclear Spin Hyperpolarization in Metal-Free Activation of Parahydrogen by Molecular Tweezers', Journal of Physical Chemistry Letters, vol. 9, no. 4, pp. 903-907. https://doi.org/10.1021/acs.jpclett.7b03433

APA

Sorochkina, K., Zhivonitko, V. V., Chernichenko, K., Telkki, V. V., Repo, T., & Koptyug, I. V. (2018). Spontaneous 15N Nuclear Spin Hyperpolarization in Metal-Free Activation of Parahydrogen by Molecular Tweezers. Journal of Physical Chemistry Letters, 9(4), 903-907. https://doi.org/10.1021/acs.jpclett.7b03433

Vancouver

Sorochkina K, Zhivonitko VV, Chernichenko K, Telkki VV, Repo T, Koptyug IV. Spontaneous 15N Nuclear Spin Hyperpolarization in Metal-Free Activation of Parahydrogen by Molecular Tweezers. Journal of Physical Chemistry Letters. 2018 Feb 15;9(4):903-907. doi: 10.1021/acs.jpclett.7b03433

Author

Sorochkina, Kristina ; Zhivonitko, Vladimir V. ; Chernichenko, Konstantin et al. / Spontaneous 15N Nuclear Spin Hyperpolarization in Metal-Free Activation of Parahydrogen by Molecular Tweezers. In: Journal of Physical Chemistry Letters. 2018 ; Vol. 9, No. 4. pp. 903-907.

BibTeX

@article{b7168dabd8744a41beebcee323242d59,
title = "Spontaneous 15N Nuclear Spin Hyperpolarization in Metal-Free Activation of Parahydrogen by Molecular Tweezers",
abstract = "The ability of frustrated Lewis pairs (FLPs) to activate H2 is of significant interest for metal-free catalysis. The activation of H2 is also the key element of parahydrogen-induced polarization (PHIP), one of the nuclear spin hyperpolarization techniques. It is demonstrated that o-phenylene-based ansa-aminoboranes (AABs) can produce 1H nuclear spin hyperpolarization through a reversible interaction with parahydrogen at ambient temperatures. Heteronuclei are useful in NMR and MRI as well because they have a broad chemical shift range and long relaxation times and may act as background-free labels. We report spontaneous formation of 15N hyperpolarization of the N-H site for a family of AABs. The process is efficient at the high magnetic field of an NMR magnet (7 T), and it provides up to 350-fold 15N signal enhancements. Different hyperpolarization effects are observed with various AAB structures and in a broad temperature range. Spontaneous hyperpolarization, albeit an order of magnitude weaker than that for 15N, was also observed for 11B nuclei.",
keywords = "FRUSTRATED LEWIS PAIRS, PARA-HYDROGEN, INDUCED POLARIZATION, NMR, MRI, RELAXATION, ALIGNMENT, SABRE, ORDER, P-31",
author = "Kristina Sorochkina and Zhivonitko, {Vladimir V.} and Konstantin Chernichenko and Telkki, {Ville Veikko} and Timo Repo and Koptyug, {Igor V.}",
year = "2018",
month = feb,
day = "15",
doi = "10.1021/acs.jpclett.7b03433",
language = "English",
volume = "9",
pages = "903--907",
journal = "Journal of Physical Chemistry Letters",
issn = "1948-7185",
publisher = "American Chemical Society",
number = "4",

}

RIS

TY - JOUR

T1 - Spontaneous 15N Nuclear Spin Hyperpolarization in Metal-Free Activation of Parahydrogen by Molecular Tweezers

AU - Sorochkina, Kristina

AU - Zhivonitko, Vladimir V.

AU - Chernichenko, Konstantin

AU - Telkki, Ville Veikko

AU - Repo, Timo

AU - Koptyug, Igor V.

PY - 2018/2/15

Y1 - 2018/2/15

N2 - The ability of frustrated Lewis pairs (FLPs) to activate H2 is of significant interest for metal-free catalysis. The activation of H2 is also the key element of parahydrogen-induced polarization (PHIP), one of the nuclear spin hyperpolarization techniques. It is demonstrated that o-phenylene-based ansa-aminoboranes (AABs) can produce 1H nuclear spin hyperpolarization through a reversible interaction with parahydrogen at ambient temperatures. Heteronuclei are useful in NMR and MRI as well because they have a broad chemical shift range and long relaxation times and may act as background-free labels. We report spontaneous formation of 15N hyperpolarization of the N-H site for a family of AABs. The process is efficient at the high magnetic field of an NMR magnet (7 T), and it provides up to 350-fold 15N signal enhancements. Different hyperpolarization effects are observed with various AAB structures and in a broad temperature range. Spontaneous hyperpolarization, albeit an order of magnitude weaker than that for 15N, was also observed for 11B nuclei.

AB - The ability of frustrated Lewis pairs (FLPs) to activate H2 is of significant interest for metal-free catalysis. The activation of H2 is also the key element of parahydrogen-induced polarization (PHIP), one of the nuclear spin hyperpolarization techniques. It is demonstrated that o-phenylene-based ansa-aminoboranes (AABs) can produce 1H nuclear spin hyperpolarization through a reversible interaction with parahydrogen at ambient temperatures. Heteronuclei are useful in NMR and MRI as well because they have a broad chemical shift range and long relaxation times and may act as background-free labels. We report spontaneous formation of 15N hyperpolarization of the N-H site for a family of AABs. The process is efficient at the high magnetic field of an NMR magnet (7 T), and it provides up to 350-fold 15N signal enhancements. Different hyperpolarization effects are observed with various AAB structures and in a broad temperature range. Spontaneous hyperpolarization, albeit an order of magnitude weaker than that for 15N, was also observed for 11B nuclei.

KW - FRUSTRATED LEWIS PAIRS

KW - PARA-HYDROGEN

KW - INDUCED POLARIZATION

KW - NMR

KW - MRI

KW - RELAXATION

KW - ALIGNMENT

KW - SABRE

KW - ORDER

KW - P-31

UR - http://www.scopus.com/inward/record.url?scp=85042201088&partnerID=8YFLogxK

U2 - 10.1021/acs.jpclett.7b03433

DO - 10.1021/acs.jpclett.7b03433

M3 - Article

C2 - 29401399

AN - SCOPUS:85042201088

VL - 9

SP - 903

EP - 907

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

SN - 1948-7185

IS - 4

ER -

ID: 10453496