[22a-E205-1~12] 10.5 Application of magnetic field

▼ [22a-E205-8] Analysis on Chemical Shift Anisotropy via In situ Solid-state NMR for Magnetically Oriented Microcrystal Suspension

〇Hayate Yasui¹, Kayoko Kobayashi¹, Masahisa Wada¹, Kazuyuki Takeda², Ryosuke Kusumi¹ (1.Grad. School of Agr., Kyoto Univ., 2.Grad. School of Sci., Kyoto Univ.)

Keywords:Magnetic Orientation, NMR, Chemical Shift Tensor

Solid-state NMR is a powerful spectroscopic tool, and it provides information about the electronic state via chemical shift (CS). One traditional way toward full determination of the CS tensor is to employ the single-crystal (SC) rotation method, but this method requires a relatively large SC which is often hard to obtain. So far, we have demonstrated in-situ NMR of a Magnetically Oriented Microcrystal Suspension (MOMS) in liquid medium under rotating magnetic field with modulation. In MOMS, rotation of the aligned microcrystals can only be performed about one of the magnetic susceptibility axes, which, however, is insufficient for full determination of the CS tensor as long as the sample-rotation axis is normal to B₀. In the present study, we developed a probe, which enables temporal tilt of the axis of modulated-rotation only during the period of pulse application and NMR signal acquisition. We can completely characterize the CS tensors of ¹³C in L-alanine by using this probe.