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Studies of liquid phase intermolecular interactions utilizing ¹H and ¹³C dynamic nuclear polarization and nuclear magnetic resonance techniques
Liquid phase l3C DNP experimental data were collected in a flow transfer system
for different organic molecules, such as acetone, acetaldehyde, diethyl malonate, ethyl
acetoacetate, diphenylmethane, and triphenylmethane. These molecules represent a wide
range of functional groups with different acidities of the respective carbon-hydrogen
bonds. The l3C DNP results demonstrated that the scalar dominated enhancement is
sensitive to the acidity of carbon-hydrogen bonds as well as to the correlation times of the
sample molecules. A hydrogen bonding spin polarization model is used, for the first time,
to interpret the scalar components induced by the nitroxide free radical at the carbon sites
of the acidic carbon-hydrogen bonds.