Acta Crystallographica Section B

Structural Science

Volume 49, Part 2 (April 1993)

• research papers
• short communications
• international union of crystallography

research papers

Acta Cryst. (1993). B49, 147-153    [doi:10.1107/S0108768192004701]

Multipole analysis of the electron density in triphylite, LiFePO₄, using X-ray diffraction data

V. A. Streltsov, E. L. Belokoneva, V. G. Tsirelson and N. K. Hansen

Acta Cryst. (1993). B49, 153-158    [doi:10.1107/S0108768192011522]

Maximum entropy as a tool for the determination of the c-axis profile of layered compounds

P. Depondt, D. A. Neumann and S. F. Trevino

Acta Cryst. (1993). B49, 158-164    [doi:10.1107/S0108768192006529]

Structures of the lovozerite type - a quantitative investigation

Yu. A. Malinovsky, H. Burzlaff and W. Rothammel

Acta Cryst. (1993). B49, 165-169    [doi:10.1107/S0108768192007742]

Refinement of atomic positions in bixbyite oxides using perturbed angular correlation spectroscopy

A. Bartos, K. P. Lieb, M. Uhrmacher and D. Wiarda

Acta Cryst. (1993). B49, 169-171    [doi:10.1107/S0108768192007559]

High-pressure phases in the system W-O. II. Structure determination of WO_2.625 by HRTEM and X-ray powder diffraction analysis

Yu. A. Barabanenkov, N. D. Zakharov, I. P. Zibrov, V. P. Filonenko, P. Werner, A. I. Popov and M. D. Valkovskii

Acta Cryst. (1993). B49, 172-179    [doi:10.1107/S0108768192008048]

The modulated structure of synthetic Co-åkermanite, Ca₂CoSi₂O₇

K. Hagiya, M. Ohmasa and K. Iishi

Acta Cryst. (1993). B49, 179-192    [doi:10.1107/S0108768192008991]

The experimental electron density in monoclinic cobalt sulfate hexahydrate, CoSO₄.6D₂O, at 25 K

T. Kellersohn, R. G. Delaplane, I. Olovsson and G. J. McIntyre

Acta Cryst. (1993). B49, 192-201    [doi:10.1107/S0108768192009583]

Bonding deformation and superposition in the electron density of tetragonal NiSO₄.6H₂O at 25 K

H. Ptasiewicz-Bak, I. Olovsson and G. J. McIntyre

Acta Cryst. (1993). B49, 201-203    [doi:10.1107/S0108768192008723]

Structure refinement of Mg₂Cu and a comparison of the Mg₂Cu, Mg₂Ni and Al₂Cu structure types

F. Gingl, P. Selvam and K. Yvon

Acta Cryst. (1993). B49, 204-213    [doi:10.1107/S0108768192009303]

Structures of the nickel gallosilicate spinelloids

R. Hammond and J. Barbier

Acta Cryst. (1993). B49, 213-216    [doi:10.1107/S0108768192009297]

The geometry of twinning in HoCu₂

J. R. Seidensticker and E. R. Ryba

Acta Cryst. (1993). B49, 216-222    [doi:10.1107/S0108768192011601]

Atomic thermal parameters and thermodynamic functions for chrysoberyl (BeAl₂O₄) from vibrational spectra and transfer of empirical force fields

T. Pilati, F. Demartin, F. Cariati, S. Bruni and C. M. Gramaccioli

Acta Cryst. (1993). B49, 223-235    [doi:10.1107/S0108768192009510]

Estimation of ionicity coefficients in Li₂BeF₄ crystals by X-ray diffraction

P. Seiler

Acta Cryst. (1993). B49, 235-244    [doi:10.1107/S010876819200987X]

The twin structure of La₂Ti₂O₇: X-ray and transmission electron microscopy studies

H. W. Schmalle, T. Williams, A. Reller, A. Linden and J. G. Bednorz

Acta Cryst. (1993). B49, 244-254    [doi:10.1107/S0108768192010103]

Phasons modulate the atomic Debye-Waller factors in incommensurate structures: experimental evidence in ThBr₄ at 55 K

G. Madariaga, J. M. Pérez-Mato and I. Aramburu

Acta Cryst. (1993). B49, 254-258    [doi:10.1107/S0108768192009406]

Structure of N-(dichlorophosphinoyl)phosphorimidic trichloride, Cl₃PNP(O)Cl₂, at 100 K

F. Belaj

Acta Cryst. (1993). B49, 258-266    [doi:10.1107/S0108768192009996]

The modulated structure of the commensurate misfit-layer compound (BiSe)_1.09TaSe₂

V. Petrícek, I. Cisarova, J. L. de Boer, W. Zhou, A. Meetsma, G. A. Wiegers and S. van Smaalen

Acta Cryst. (1993). B49, 266-272    [doi:10.1107/S0108768192010000]

Tables of coincidence orientations for ordered tetragonal L1₀ alloys for a range of axial ratios

A. Singh and A. H. King

Acta Cryst. (1993). B49, 272-277    [doi:10.1107/S0108768192007948]

Crystalline-state racemization of a chiral cyanoethyl group connected by a hydrogen bond

Y. Takenaka, Y. Ohashi, T. Tamura, A. Uchida, Y. Sasada, Y. Ohgo and S. Baba

Acta Cryst. (1993). B49, 277-282    [doi:10.1107/S0108768192008553]

Structure of bis(2-amino-5-nitropyridinium) dichromate as a step towards the design of efficient organic-inorganic non-linear optical crystals

J. Pecaut and R. Masse

Acta Cryst. (1993). B49, 283-289    [doi:10.1107/S0108768192009224]

Crystal structure of [(C₂H₅)₃NCH₃]Cu₃Cl₇: a new structural variant of the CuCl₂ structure

S. Weise and R. D. Willett

Acta Cryst. (1993). B49, 289-303    [doi:10.1107/S0108768192009042]

Structures of hexakis(1-propyltetrazole)iron(II) bis(tetrafluoroborate), [Fe(CHN₄C₃H₇)₆](BF₄)₂, hexakis(1-methyltetrazole)iron(II) bis(tetrafluoroborate), [Fe(CHN₄CH₃)₆](BF₄)₂, and the analogous perchlorates. Their relation to spin crossover behaviour and comparison of Debye-Waller factors from structure determination and Mössbauer spectroscopy

L. Wiehl

Acta Cryst. (1993). B49, 303-309    [doi:10.1107/S0108768192007377]

A study of two polymorphic modifications of (S)-1-phenylethylammonium (S)-mandelate and the structural features of diastereomeric mandelate salts

S. Larsen and H. L. de Diego

Acta Cryst. (1993). B49, 310-316    [doi:10.1107/S0108768192008371]

Optical resolution through diastereomeric salt formation: the crystal structures of cinchoninium (R)-mandelate and cinchoninium (S)-mandelate at low temperature

S. Larsen, H. L. de Diego and D. Kozma

Acta Cryst. (1993). B49, 316-320    [doi:10.1107/S0108768192007778]

-Alkoxy Schiff base-oxazolidine tautomerism: solid-state structure of N-diphenylmethylene-L-threonine methyl ester

T. Wijayaratne, N. Collins, Y. Li, M. A. Bruck and R. Polt

Acta Cryst. (1993). B49, 320-328    [doi:10.1107/S0108768192007547]

Structural studies of cyclohexane IV

N. B. Wilding, J. Crain, P. D. Hatton and G. Bushnell-Wye

Acta Cryst. (1993). B49, 328-334    [doi:10.1107/S010876819200795X]

Structures of four N-benzoylaziridine and aziridinium p-toluenesulfonate derivatives grafted onto 7-oxabicyclo[2.2.1]heptane skeletons

A. A. Pinkerton, A. C. Gallacher, M. Radil, A. Kunze, S. Allemann and P. Vogel

Acta Cryst. (1993). B49, 334-342    [doi:10.1107/S0108768192008395]

Synthesis and crystal structure of guanidinium L-monohydrogentartrate: encapsulation of an optically nonlinear octupolar cation

J. Zyss, J. Pecaut, J. P. Levy and R. Masse

Acta Cryst. (1993). B49, 342-347    [doi:10.1107/S0108768192009169]

Structures of quinone imine metabolites related to the anti-cancer drug amsacrine

G. R. Clark, K. Robinson, W. A. Denny and H. H. Lee

Acta Cryst. (1993). B49, 348-356    [doi:10.1107/S0108768192008504]

X-ray studies on crystalline complexes involving amino acids and peptides. XXV. Structures of DL-proline hemisuccinic acid and glycyl-L-histidinium semisuccinate monohydrate and a comparative study of amino-acid and peptide complexes of succinic acid

G. S. Prasad and M. Vijayan

Acta Cryst. (1993). B49, 356-366    [doi:10.1107/S0108768192008383]

Structure and conformation of the muscarinic agonists 3-(3-amino-1,2,4-oxadiazol-5-yl)-1-azabicyclo[2.2.2]octane and 1,2,5,6-tetrahydro-1-methyl-3-pyridinecarboxaldehyde oxime and related tertiary amine, quaternary ammonium and sulfonium analogues

H. Kooijman, J. A. Kanters, J. Kroon and J. Kelder

Acta Cryst. (1993). B49, 367-374    [doi:10.1107/S0108768192010115]

Structural comparison of biologically active and inactive conjugates of -amino acids and the plant growth hormone (auxin) indole-3-acetic acid

B. Kojic-Prodic, B. Nigovic, V. Puntarec, S. Tomic and V. Magnus

Acta Cryst. (1993). B49, 375-382    [doi:10.1107/S0108768192010978]

Molecular recognition in polyols: the structure of L-mannonic acid hydrazide revealing a common packing motif in different acyclic sugars

C. André, P. Luger, J.-H. Fuhrhop and B. Rosengarten

short communications

Acta Cryst. (1993). B49, 383-386    [doi:10.1107/S0108768192007201]

Estimate of a relationship between the number of atoms and the volumes of the unit cells of organic compounds

P. Román, C. Guzmán-Miralles and A. Luque

international union of crystallography

Acta Cryst. (1993). B49, 386    [doi:10.1107/S0108768193099860]

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