The Effect of Intermolecular Halogen Bond on 19F DNP Enhancement in 1, 4-Diiodotetrafluorobenzene/4-OH-TEMPO Supramolecular Assembly

doi:10.11938/cjmr20172557

Abstract

Abstract: Halogen bond, as hydrogen bond, is a non-covalent bond. Dynamic nuclear polarization (DNP) technique has been used previously to study hydrogen bonds-mediated intermolecular interactions. However, no study has been carried out so far to study the halogen bond-mediated intermolecular interactions with DNP. In this work, ¹⁹F DNP polarization efficiency of the halogen bonds existing in supramolecular assembling by 4-OH-TEMPO and 1,4-diiodotetrafluorobenzene (DITFB) was studied on a home-made DNP system. The formation of intermolecular halogen bonds appeared to increase ¹⁹F DNP polarization efficiency, suggesting that the spin-spin interactions among electrons were weakened by the halogen bonds, resulting in an increased T_2e and a larger saturation factor.

Key words: ¹⁹F DNP, halogen bond, DITFB/4-OH-TEMPO, DNP enhancement

CLC Number:

O482.53

GAO Shan, HUANG Chong-yang, ZHANG Zhen, CHEN Jun-fei, HE Yu-gui, CHEN Li, CHEN Fang, ZHANG Jin-zhi, LIU Chao-yang. The Effect of Intermolecular Halogen Bond on ¹⁹F DNP Enhancement in 1, 4-Diiodotetrafluorobenzene/4-OH-TEMPO Supramolecular Assembly[J]. Chinese Journal of Magnetic Resonance, 2017, 34(4): 421-428.

References

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The Effect of Intermolecular Halogen Bond on ¹⁹F DNP Enhancement in 1, 4-Diiodotetrafluorobenzene/4-OH-TEMPO Supramolecular Assembly

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