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Journal of Solid State Chemistry | 1979

Deformation of the valence electron distributions in the icosahedral boron structure of α-AlB12

Tetsuzo Ito; Iwami Higashi; Tosio Sakurai

Abstract X-ray difference electron densities in α-AlB12 were examined. Broad peaks presumably characteristic of highly delocalized three-center bonds were observed at the centers of the triangular faces of the B12 icosahedron. Another kind of prominent peak on the external BB bonds of the icosahedron indicated that the inter-icosahedral BB bonds are two-center bonds. An averaging over the icosahedral symmetry significantly reduced the random noises in the difference densities. Theoretical difference electron densities for a B12H−212 molecular ion, calculated by the CNDO 2 molecular orbital method, were qualitatively in good agreement with the observed densities mentioned above. Residual peaks were observed on all the five edges of the open pentagonal face of the B19 unit; they had broad tails extending toward the aluminum triplet sites. The observed difference densities around the “single” B(23) atom suggested that the atom belongs to the B19 unit rather than being single.


Journal of Solid State Chemistry | 1980

Crystal and molecular structure of tris(hexaamminerhodium(III)) tetrakis(trichlorostannato(II))(tetrachlorostannato(II)rhodate(I) hexachlorostannate(II) tetrahydrate

Takashi Kimura; Tosio Sakurai

Abstract The crystal and molecular structure of the title compound, [Rh(NH3)6]3[Rh(SnCl3)4(SnCl4)] [SnCl6] · 4H2O, has been determined by the single-crystal X-ray diffraction method. The compound crystallizes in the monoclinic system, space group P2 n with a = 16.581(2), b = 11.010(4), c = 16.024(2)A, β = 90.76(1), and two molecules per unit cell. The structure was solved by Pattersons method and refined by the least-squares technique to give a final R factor of 0.031. The three cations, [Rh(NH3)6]3+, are a regular octahedron with an average RhN bond length of 2.07 A. The rhodium anion, [Rh(SnCl3)4(SnCl4)]5−, is a trigonal bipyramid with the two axial RhSn bonds, 2.493 A in length, and the three equatorial bonds, 2.546, 2.540, and 2.540 A. One of the three tin atoms in the equatorial trigonal plane forms a distorted trigonal bipyramid with two short SnCl bonds 2.384 A in length and two long bonds, 2.733 A. The other four tin atoms have a distorted tetrahedral arrangement with an average SnCl bond length of 2.42 A. The tin anion, [SnCl6]4−, which is not coordinated to rhodium, forms extremely long SnCl bonds of 2.763, 2.800, and 2.893 A in a distorted octahedral arrangement.


Journal of the Physical Society of Japan | 1958

The Phase Transformation of Solid Normal Hexadecanamide

Tosio Sakurai; Masaya Yabe

A phase transformation of normal hexadecanamide (C 15 H 31 CONH 2 ) in which the crossed hydrocarbon chain configuration changes into the parallel-chain one is investigated by means of X-rays, thermal analysis, infrared absorption and proton magnetic resonance absorption. Based upon the knowledge of the crystal structure and X-ray observation, a mechanism of successive reorientation of the hydrocarbon chain at this transformation is proposed. The twisting vibration of the hydrocarbon chain is found to play an important role for this transformation.


Journal of the Physical Society of Japan | 1955

The Cross-Chain Configuration and a New Type of Phase Transformation in Solid Long Chain Acid Amides

Tosio Sakurai

From the X-ray investigation on the single crystal of long chain acid amides of even carbon number from C=10 to 18, three phases are found to exist. Phase A in palmitic, myristic, and capric acid amides has the unusual crossed chain configuration similar to that found in potassium soaps. In phase B, found in palmitic and stearic acid amides, and phase C, in stearamide under a special condition, chains are parallel as in the ordinary long chain compounds. All phases seem to be stable at room temperature, but phase A of palmitic amide transforms irreversibly into phase B by heating. But the basal plane is almost unchanged during the transformation.


Journal of the Physical Society of Japan | 1950

Anomalous Specific Heat and Molecular Rotation in Normal Solid Alcohols

Yoshinobu Kakiuchi; Tosio Sakurai; Tadasu Suzuki


Journal of the Physical Society of Japan | 1949

Anomalous Specific Heat and Molecular Rotation in Solid Normal Hexadecyl Alcohol

Yoshinobu Kakiuchi; Tosio Sakurai


Journal of the Physical Society of Japan | 1968

On the Crystal Structure Analysis using Aspherical Atomic Scattering Factors

Tosio Sakurai; Tetsuzo Ito


Chemistry Letters | 1981

THE CRYSTAL STRUCTURE OF μ-L-TARTRATO-DICOBALT(III) COMPLEX, Δ-cis(O,O),trans(O,O)-[(en)2Co(tart)(3−)Co(tart)(1−)(en)2]Na(C1O4)3·5H2O

Yuji Matsumoto; Eiichi Miki; Kunihiko Mizumachi; Tatsujiro Ishimori; Takashi Kimura; Tosio Sakurai


Journal of the Physical Society of Japan | 1951

On the Transformation of Long Chain Acid Amides.

Tosio Sakurai


Archive | 1970

ON THE UNIVERSAL CRYSTALLOGRAPHIC COMPUTATION PROGRAM SYSTEM. (II) THE 5020 UNICS

Tosio Sakurai; Tetsuzo Ito; Hitoshi Iwasaki; Yasunari Watanabe; Mitoyoko Fukuhara

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Tetsuzo Ito

Kanagawa Institute of Technology

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Iwami Higashi

Chiba Institute of Technology

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