Tubes are flushed with acetone, then with deionized water under pressurized N 2 gas, then flushed with N 2 gas. Small components (glass parts and PTFE connectors) are cleaned with acetone and water, then dried in the oven over night. Before reuse the device is reassembled and further dried with a heat gun under N 2 .
Abstract. Among hyperpolarization techniques, quantum-rotor-induced polarization (QRIP), also known as the Haupt effect, is a peculiar one. It is, on the one hand, rather simple to apply by cooling and heating a sample. On the other hand, only the methyl groups of a few substances seem to allow for the effect, which strongly limits the applicability of QRIP. While it is known that a high tunnel frequency is required, the structural conditions for the effect to occur have not been exhaustively studied yet. Here we report on our efforts to heuristically recognize structural motifs in molecular crystals able to allow to produce QRIP.
Abstract. Among hyperpolarization techniques, quantum-rotor induced polarization (QRIP), also known as Haupt effect, is a peculiar one. It is on one hand rather simple to apply by cooling and heating of a sample. On the other hand, only the methyl groups of a few substances seem to allow for the effect, which strongly limits the applicability of QRIP. While it is known, that a high tunnel frequency is favorable, the structural requirements for the effect to occur are not exhaustively studied yet. Here we report on our efforts to heuristically recognize structural motifs in molecular crystals able to allow to produce QRIP.
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