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65 citations found for Hashizume,

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The title compound, [Co(C4H7N2O2)2(C4H7O2)(C9H12N3P)], has been analyzed by X-ray diffraction to correlate the structure with the reactivity of the photoracemization on exposure to visible light. Although the crystal decomposed during the racemization, the size of the reaction cavity for the 1-methoxycarbonylethyl group explains the high reactivity.


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A Suzuki coupling reaction produced the title compound, C44H66N2O2, which consists of a photoisomerizable azobenzene unit coupled to a biphenyl group and a long alkyl chain. The mol­ecule has a trans configuration with respect to the azo (–N=N–) group, and the long alkyl chain adopts a well ordered zigzag arrangement.


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The title compound, C21H10Cl10O6, has been extracted from mushroom Phellinus sp. The mol­ecule has a highly chlorinated diaryl­catechol ether skeleton. The neighboring benzene rings are arranged approximately perpendicular to each other. There are inter­molecular O-H...O hydrogen bonds and Cl...Cl/O short contacts.


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Acta Cryst. (2014). A70, C1698
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Some organic molecules containing Si atom(s) are very labile, even if the corresponding carbon analogs are very stable. To gain information on bonding modes of such compounds, we analyzed valence density distribution, which play critical roles in chemistry of molecule, by applying multipole expansion method. Very recently, an imine coordinated silacyclopropan-1-one, 1, has synthesized by Baceiredo, Kato and co-workers.[1] To clarify the bonding mode of 1, the electron density distributions of 1 and its precursor have analyzed by a multiple expansion method using single crystal X-ray diffraction data. As shown in static model density maps, bonding electrons of Si-C bonds distribute on the outside of the silacyclopropane ring (Si1-C1-C2 ring) (Fig. 1a) with largely extent, in compared with that of the precursor, indicating an in-plane pi-interaction on the Si1-C1 and Si1-C2 bonds. On the other hand, the C1-C2 bonding electrons distribute on the bond, and the bond critical point (BCP) is located on the inside of the three membered ring. In addition, the C1-C2 bonding electrons elongates inside the ring toward the Si1 atom, indicating electron donation from sigma(C1-C2)-bond to the Si1 (Fig. 1b). Consequently, these maps propose greater contribution of canonical structures in Fig. 1c.

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The title compounds, 3a,9a-trans-9,9a-trans-4,4-di­methyl-9-phenyl-2,3,3a,4,9,9a-hexa­hydro­benzo­[f]­indene, C21H24, (I), and 3a,4-trans-3a,9a-cis-9,9a-trans-4-methoxy-9-phenyl-2,3,3a,4,9,9a-hexa­hydro­benzo­[f]­indene, C20H22O, (II), are products of the photoinduced electron-transfer reaction of 1,1-di­phenyl-1,n-alka­dienes. The molecular structures are in good agreement with those proposed from the reaction mechanisms. The central rings of the fused systems of both compounds take chair and boat conformations in (I) and (II), respectively. There are no remarkable short contacts shorter than the sum of the van der Waals radii in the crystals, but some weak C-H...[pi] interactions are found.

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Acta Cryst. (2008). A64, C70
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Acta Cryst. (2005). A61, c426-c427
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Acta Cryst. (1996). A52, C454
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Five two-component molecular crystals, benzimidazolium 3-nitro­benzoate, C7H7N2+·C7H4NO4-, (I), benzimidazolium 4-nitro­benzoate, C7H7N2+·C7H4NO4-, (II), 1H-benzotriazole-3-nitro­benzoic acid (1/1), C6H5N3·C7H5NO4, (III), imidazol­ium 3-nitro­benzoate, C3H5N2+·C7H4NO4-, (IV), and imid­azolium 4-nitro­benzoate, C3H5N2+·C7H4NO4-, (V), were prepared with the aim of making chiral crystals. Only (I) crystallizes in a chiral space group. The mol­ecules of (I) and (II) are linked by hydrogen bonds to form 21 spiral chains. In (III), (IV) and (V), macrocyclic structures are formed from two acid and two base components, by an alternate arrangement of the acid and base moieties.

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Acta Cryst. (1993). A49, c170
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The mechanism of the first-order solid-to-solid phase transition of 1-ethyl-3-(4-methylpentanoyl)urea crystal was clarified by analysing the structure of intermediate stages of the transformation with a detailed temperature-resolved single-crystal diffraction method.

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A typographical error has occurred in Hashizume [J. Appl. Cryst. (1983). 16, 420-427]. The first two complete sentences on page 425 should read: A attains a minimum value of 0.024 at bII = 0.27, where about half of the initial fundamental intensity is preserved. The initial rise of the fundamental intensity, which occurs in the range 1.0 > bII [greater-than or equal to] 0.64, is accounted for by a close examination of the overlap pattern of R(1)HI and, R(1)0II at the relevant bII values: the shifted and extended peak profile of R(1)0II admits the high-angle tail of R(1)HI and rejects the low-angle flank of R(1)HI, and the gain due to the former more than compensates for the loss caused by the latter.

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Acta Cryst. (1993). A49, c330-c331
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An X-ray television camera using a phosphor screen coupled to an image orthicon tube was prepared to detect and record diffraction patterns rapidly. It is about 750 times more sensitive than photographic film, producing a video signal of S/N = 10 for incident 4 × 104 Cu K[alpha] quanta sec-1 mm-2, and has a dynamic range of 1:30 and a spatial resolution of 6.4 Lp mm-1. The detector system was tested by recording rotation patterns from a single-crystal of diformylhydrazine, where it was demonstrated that one can measure reflection intensities with an accuracy better than 10%. To process the TV picture by computer, an image readout device using a storage tube was built. The high sensitivity and the large detection window (42 mm in diameter) of the camera and the fast speed (40 [mu]s for each 80 × 80 [mu]m resolution element) of the readout device make the incorporated system most appropriate for rapid measurement of simultaneous reflexions from macromolecular crystals. The camera can also record small-angle diffraction patterns from muscle in an exposure time of a few seconds.

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Acta Cryst. (1987). A43, C226
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To suppress unwanted harmonics in crystal-diffracted synchrotron X-radiation, monolithic grooved-crystal monochromators have been studied in theory and experiment. Simply by building non-parallel groove walls in a perfect crystal, the overlap of dynamical diffraction ranges on the two crystals is canceled for higher harmonics, while a partial overlap is preserved for the fundamental, leading to a substantial improvement in fundamental-to-harmonics ratio in the diffracted beam. A grooved silicon 111 monochromator with wall angles of 0 and 7° delivers a beam of harmonic contamination better than 3.3% at fundamental wavelengths between 1.2 and 1.6 Å with a beam intensity exceeding 50% of that available from a standard channel-cut crystal. Silicon 331 and 511 versions can achieve harmonic contaminations well below 0.1%. Asymmetrically grooved monochromators can work as stable wavelength scanners free from harmonics requiring no delicate control of angle.

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