Discrimination of PHIP Signals Through their Evolution in Multipulse Sequences

BUSSANDRI, S.; FRANZONI, M.B.; BULJUBASICH, L.; ACOSTA, R.H.

Chemphyschem

WILEY-V C H VERLAG GMBH

Año: 2021 vol. 22 p. 1939 - 1946

1439-4235

The antiphase character of the PHIP associated signals after a hydrogenation reaction is particularly sensitive to line broadening introduced by magnetic field inhomogeneities and interferences by the presence of resonance lines steaming from a large amount of thermally polarized spins. These obstacles impose a limitation in the detection of reaction products as well as in the experimental setups. A simple way to overcome these impediments consists of acquiring the signal with a train of refocusing pulses instead of a single r.f. pulse. We present here a number of examples where this multipulse acquisition, denominated PhD-PHIP, displays its potentiality in improving the information related to hyperpolarized spins performed in a sample, where the former parahydrogen nuclei are part of a complex J-coupling network.