The reaction of an iridium PNP complex with parahydrogen facilitates polarisation transfer without chemical change

TY - JOUR

T1 - The reaction of an iridium PNP complex with parahydrogen facilitates polarisation transfer without chemical change

AU - Holmes, Arthur J.

AU - Rayner, Peter J.

AU - Cowley, Michael J.

AU - Green, Gary G R

AU - Whitwood, Adrian C.

AU - Duckett, Simon B.

PY - 2015

Y1 - 2015

N2 - The short lived pincer complex [(C5H3N(CH2P(tBu)2)2)Ir(H)2(py)]BF4 is shown to be active for signal amplification by reversible exchange. This catalyst formulation enables the efficient transfer of polarization from parahydrogen to be placed into just a single molecule of the hyperpolarisation target, pyridine. When the catalysts 1H nuclei are replaced by 2H, increased levels of substrate hyperpolarization result and when the reverse situation is examined the catalyst itself is clearly visible through hyperpolarised signals. The ligand exchange pathways of [(C5H3N(CH2P(tBu)2)2)Ir(H)2(py)]BF4 that are associated with this process are shown to involve the formation of 16-electron [(C5H3N(CH2P(tBu)2)2)Ir(H)2]BF4 and the 18-electron H2 addition product [(C5H3N(CH2P(tBu)2)2)Ir(H)2(H2)]BF4. This journal is

AB - The short lived pincer complex [(C5H3N(CH2P(tBu)2)2)Ir(H)2(py)]BF4 is shown to be active for signal amplification by reversible exchange. This catalyst formulation enables the efficient transfer of polarization from parahydrogen to be placed into just a single molecule of the hyperpolarisation target, pyridine. When the catalysts 1H nuclei are replaced by 2H, increased levels of substrate hyperpolarization result and when the reverse situation is examined the catalyst itself is clearly visible through hyperpolarised signals. The ligand exchange pathways of [(C5H3N(CH2P(tBu)2)2)Ir(H)2(py)]BF4 that are associated with this process are shown to involve the formation of 16-electron [(C5H3N(CH2P(tBu)2)2)Ir(H)2]BF4 and the 18-electron H2 addition product [(C5H3N(CH2P(tBu)2)2)Ir(H)2(H2)]BF4. This journal is

UR - http://www.scopus.com/inward/record.url?scp=84919347944&partnerID=8YFLogxK

U2 - 10.1039/c4dt03088e

DO - 10.1039/c4dt03088e

M3 - Article

AN - SCOPUS:84919347944

SN - 1477-9226

VL - 44

SP - 1077

EP - 1083

JO - Dalton Transactions

JF - Dalton Transactions

IS - 3

ER -