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Crystal Structure of (CH3)2ND2D2PO4 at Room Temperature Studied by Neutron Diffraction
Mitsuo Machida,Masaru Komukae,Toshio Osaka 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Crystal structure of deuterated dimethylammonium dihydrogen phosphate (CH3)2ND2D2PO4 was determined in the ferroelectric phase at 298 K by neutron diffraction. Deuteration ratio is estimated to be 0.913. Lengths of hydrogen bonds forming chains of phosphate anions are 2.50 and 2.59 A.
NMR Study of Orientational Order in the 7OCB Nematic Liquid Crystal
Mitsuo Machida,T Kakiuchi 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
Orientational ordering of 7OCB (4-heptyloxyl-4'-cyanobipheny) in the nematic phase was studied by analyzing the chemical shift of the 13C NMR spectra. The spectra calculated for aromatic carbons reproduce well the observed ones. The obtained orientational order-parameters are 0.444 at 343 K and 0.595 at 315 K.g
Structure of Inclusion Compound C6H11Br/SC(NH2)2 Studied by X-ray Diffraction
Toku Ishibashi,Mitsuo Machida,Nobumitsu Koyano 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Single crystal X-ray structure analysis has been carried out for bromocyclohexane/thiourea inclusion compound C6H11Br/SC(NH2)2. The structure analysis disclosed an arrangement of guest molecules and hydrogen bonds of the host subunit. The guest molecules are disordered among six orientations around the special positions (1/4, 1/4, 1/4) and (3/4, 3/4, 3/4) with D3d site symmetry. The disorder motion consists of a three-fold reorientation around the channel axis and three two-fold reorientations around the axes perpendicular to the channel axis.