SABRE-Relay: A Versatile Route to Hyperpolarization

TY - JOUR

T1 - SABRE-Relay

T2 - A Versatile Route to Hyperpolarization

AU - Roy, Soumya S.

AU - Appleby, Kate M.

AU - Fear, Elizabeth J.

AU - Duckett, Simon B.

N1 - © American Chemical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

PY - 2018/3/1

Y1 - 2018/3/1

N2 - Signal Amplification by Reversible Exchange (SABRE) is used to switch on the latent singlet spin order of para-hydrogen (p-H2) so that it can hyperpolarize a substrate (sub = nicotinamide, nicotinate, niacin, pyrimidine and pyrazine). The substrate then reacts reversibly with [Pt(OTf)2(bis-diphenylphosphinopropane)] by displacing OTf- to form [Pt(OTf)(sub)(bis-diphenylphosphinopropane)]OTf. The 31P NMR signals of these metal complexes prove to be enhanced when the substrate possesses an accessible singlet state or long-lived Zeeman polarization. In the case of pyrazine, the corresponding 31P signal was 105 ± 8 times larger than expected, which equated to an 8-hour reduction in total scan time for an equivalent signal to noise ratio under normal acquisition conditions. Hence p-H2 derived spin order is successfully relayed into a second metal complex via a suitable polarization carrier (sub). When fully developed we expect this route involving a second catalyst to successfully hyperpolarize many classes of substrate that are not amenable to normal SABRE.

AB - Signal Amplification by Reversible Exchange (SABRE) is used to switch on the latent singlet spin order of para-hydrogen (p-H2) so that it can hyperpolarize a substrate (sub = nicotinamide, nicotinate, niacin, pyrimidine and pyrazine). The substrate then reacts reversibly with [Pt(OTf)2(bis-diphenylphosphinopropane)] by displacing OTf- to form [Pt(OTf)(sub)(bis-diphenylphosphinopropane)]OTf. The 31P NMR signals of these metal complexes prove to be enhanced when the substrate possesses an accessible singlet state or long-lived Zeeman polarization. In the case of pyrazine, the corresponding 31P signal was 105 ± 8 times larger than expected, which equated to an 8-hour reduction in total scan time for an equivalent signal to noise ratio under normal acquisition conditions. Hence p-H2 derived spin order is successfully relayed into a second metal complex via a suitable polarization carrier (sub). When fully developed we expect this route involving a second catalyst to successfully hyperpolarize many classes of substrate that are not amenable to normal SABRE.

UR - http://www.scopus.com/inward/record.url?scp=85042685988&partnerID=8YFLogxK

U2 - 10.1021/acs.jpclett.7b03026

DO - 10.1021/acs.jpclett.7b03026

M3 - Article

AN - SCOPUS:85042685988

SN - 1948-7185

VL - 9

SP - 1112

EP - 1117

JO - JOURNAL OF PHYSICAL CHEMISTRY LETTERS

JF - JOURNAL OF PHYSICAL CHEMISTRY LETTERS

IS - 5

M1 - jz-2017-03026f.R3

ER -