Acta Crystallographica Section B
Acta Crystallographica
Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

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STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

Volume 49| Part 2

ISSN: 2052-5206

April 1993 issue

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research papers

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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

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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

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Structures of the lovozerite type – a quantitative investigation

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

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

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

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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

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The modulated structure of synthetic Co-åkermanite, Ca₂CoSi₂O₇

K. Hagiya, M. Ohmasa and K. Iishi

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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

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

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

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

F. Gingl, P. Selvam and K. Yvon

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Structures of the nickel gallosilicate spinelloids

R. Hammond and J. Barbier

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The geometry of twinning in HoCu₂

J. R. Seidensticker and E. R. Ryba

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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

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

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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

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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

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

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

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

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

A. Singh and A. H. King

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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

CCDC references: 1202264; 1202265

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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

CCDC reference: 1202266

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

S. Weise and R. D. Willett

CCDC reference: 1202267

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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

CCDC references: 1182600; 1182601; 1182602; 1191336; 1191337; 1191338; 1191339

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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

CCDC reference: 1229664

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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

CCDC references: 1202269; 1202270

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β-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

CCDC reference: 1202271

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Structural studies of cyclohexane IV

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

CCDC references: 1134563; 1134564; 1134565

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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

CCDC references: 1202272; 1202273; 1202274; 1202275

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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

CCDC reference: 1202276

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

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

CCDC references: 1202277; 1202278; 1202279

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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

CCDC references: 1202280; 1202281

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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

CCDC references: 1202283; 1202284

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

B. Kojić-Prodić, B. Nigović, V. Puntarec, S. Tomić and V. Magnus

CCDC references: 1202288; 1202290

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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

CCDC reference: 1202285

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short communications

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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

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international union of crystallography

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Access to CIFs archived in Chester

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Modulated structures

The theory of modulated structures and the study of such materials constitute an active and healthy field in crystallography. To view visualizations of over 60 modulated stuctures published in Acta Crystallographica Section B, click on the structure below.

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