X-ray diffraction study of a pseudo single crystal prepared from a crystal belonging to point group 2

Abstract

A pseudo single crystal (a composite of matrix resin and powder crystallites, wherein the individual crystallites are aligned three‐dimensionally) was prepared from a powder of sucrose, and its X‐ray diffraction pattern was studied. A powder of sucrose crystals suspended in a UV‐curable resin precursor was subjected to magnetic alignment in order to align the individual crystallites three‐dimensionally, and then the resin precursor was photopolymerized to maintain this orientation. The pseudo single crystal thus obtained produced a well resolved X‐ray diffraction profile that is similar to that produced by a twin crystal. The origin of the twin orientation was explained in terms of the interplay between the symmetry of magnetic susceptibility axes and the crystal symmetry (point group 2) of sucrose. The crystal structure of sucrose solved using the pseudo single crystal was in excellent agreement with that solved using a single crystal.

Chemical shift tensor determination using magnetically oriented microcrystal array (MOMA): 13C solid-state CP NMR without MAS

“…The MOMA method is applicable to the biaxial crystal systems including the triclinic, monoclinic, and orthorhombic systems. We have reported the X-ray measurements of MOMAs fabricated from L-alanine [15], LiCoPO 4 [16], sucrose [17], and lysozyme [19] microcrystalline powders, which gave rise to diffraction patterns similar to those of the corresponding single crystals. The crystal structures determined from the MOMAs were in good agreement with those reported for the corresponding single crystals in the literature.…”

“…A MOMA is a composite in which microcrystals are aligned three-dimensionally [14][15][16][17][18][19]. The concept of the three-dimensional crystal alignment was reported in Ref.…”

Single-crystal NMR approach for determining chemical shift tensors from powder samples via magnetically oriented microcrystal arrays

“…Generally, a large single crystal is required to obtain sufficient S/N from the samples; this requirement limits the use of single crystals in NMR because it is difficult to grow large crystals under many circumstances. Previously, we have shown that microcrystals suspended in a liquid medium can undergo biaxial alignment when subjected to frequency-modulated rotating magnetic fields [12][13][14][15][16]. By solidifying the liquid medium after the alignment, we obtain a magnetically oriented microcrystal array (MOMA), which is a polymer composite with embedded microcrystals that are three-dimensionally aligned.…”

Three-Dimensional Magnetically-Oriented Microcrystal Array: A Large Sample for Neutron Diffraction Analysis

“…The crystallographic and magnetic axes are shown schematically in Fig. 2b, where the b axis and axis are placed perpendicular to the plane of the diagram (F. Kimura et al, 2010b). Since the three magnetic susceptibility axes are mutually perpendicular, the other two magnetic susceptibility axes are placed on the plane of the diagram.…”