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1

Digitale Medien

X-ray structure of 5-phenyl-1,3,4-oxathiazol-2-one (1995)

Schriver, Melbourne J. ; Zaworotko, Michael J.

Springer

Journal of chemical crystallography 25 (1995), S. 25-28

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ISSN: 1572-8854

Schlagwort(e): Oxathiazolone ; structure ; nitrile sulfide

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract The X-ray crystal structure of 5-phenyl-1,3,4-oxathiazol-2-one has been determined. Colorless, regular plate shaped crystals of C8H5O2NS crystallize in the monoclinic space group P21/n (#14) with cell dimensionsa=11·161(8),b=7·1470(20),c=19·864(15) Å and β=99·77(4)°;V=1561·5(17) Å3 andZ=8.1725 unique reflections withl net〉2.5σ(l) on refinement afforded values ofR=0.054 andR w=0.049.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01666190

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2

Digitale Medien

X-ray crystal structure and1H-NMR chiral shift reagent study of a crown trimer (1995)

Salmón, Manuel ; Cabrera, Armando ; Zavala, Nieves ; [weitere]

Springer

Journal of chemical crystallography 25 (1995), S. 759-762

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ISSN: 1572-8854

Schlagwort(e): Cyclooligomerization ; orthocyclophanes ; structure ; X-ray diffraction ; C−H...O molecular interactions

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract 3,4,5-Trimethoxybenzyl alcohol was cyclooligomerized with a bentonite clay used as a catalyst. Results of the crystal structure analysis of the racemic (±) nonamethoxy[1,1,1]orthocyclophane trimer, C30H36O9, are described. The structure was determined by X-ray diffraction at 293 K and shown to belong to the triclinic space group P $$\bar 1$$ . The compound possesses a distorted crown conformation with unusual C−H...O intermolecular interactions, and with a crystal packing not observed before in other related derivatives. The racemic mixture was also discriminated in its two enantiomeric isomers, using proton NMR and Eu(III) as a chiral shift reagent.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01670332

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3

Digitale Medien

X-ray structure of 1,3-adamantane dicarbonamide (1995)

Bridson, John N. ; Schriver, Melbourne J. ; Zhu, Shuguang

Springer

Journal of chemical crystallography 25 (1995), S. 11-14

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ISSN: 1572-8854

Schlagwort(e): Adamantane ; dicarbonamide ; structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract The X-ray crystal structure of 1,3-adamantane-dicarbonamide† has been determined. Colourless, cube shaped crystals of C12H18N2O2 crystallize in the monoclinic space group C2/c (#15) with cell dimensionsa=7·934(3),b=15·543(3),c=9·404(2) Å, β=93.63°;V=1157.4(5) Å3 andZ=4.1074 unique reflections withI net 〉2.00σ(I) on refinement afforded values ofR=0.039 andR w =0.040.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01666187

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4

Digitale Medien

X-ray and NMR studies on the rotational isomerism about the C(5)-C(6) bond of 6-substituted methyl 2,3,4,-tri-O-acetyl-6-X-α-D-glucopyranoside derivatives (1995)

Mentzafos, D. ; Polissiou, M. ; Grapsas, I. ; [weitere]

Springer

Journal of chemical crystallography 25 (1995), S. 157-164

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ISSN: 1572-8854

Schlagwort(e): Derivatives ; rotamers ; 1H-NMR ; x-ray ; structure ; 2,3,4, tri-O-acetyl-6-X-α-D-glucopyranosides

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract The rotamers about the C(5)–C(6) bond of a series of 2,3,4-tri-O-acetyl-6-X-α-D-glucopyranozide derivatives resulting by substitution at C(6) or O(6) have been studies with1H-NMR spectroscopy (400 MHz) and X-ray structure analysis. The methyl 2,3,4-tri-O-acetyl-6-O-triphenylmethyl-α-D-glucopyranoside and the N-(I-O-methyl-2,3,4-tri-O-acetyl-α-D-glucopyranose-6-yl)-pyridinium nitrate crystallize in the P21 space group with α=14.940(1),b=11.232(1),c=9.0773(7), and β=94.480(7) anda=7.670(1),b=15.384(3),c=9.624(1) and β=104.90(1), respectively; the methyl 2,3,4-tri-O-acetyl-6-O-nitro-α-D-glucopyranoside and methyl 2,3,4-tri-O-acetyl-6-O-deoxy-6-iodo-α-D-glucopyrano-side crystallize in the P212121 space group witha=5.630(1),b=14.360(1) andc=22.388(3), anda=5.556(1),b=14.303(6) andc=21.963(6), respectively.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01666100

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5

Digitale Medien

Structural and spectroscopic characterization of the macrocyclic complex: [Tb(CrO4)(H2O)(C22H26N6)] ·0.5(Cr2O7)·(H2O) (1995)

Ayala, J. D. ; Bombieri, G. ; Benetollo, F. ; [weitere]

Springer

Journal of chemical crystallography 25 (1995), S. 355-360

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ISSN: 1572-8854

Schlagwort(e): Terbium ; hexaazamacrocyclic complex ; structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract The title complex was obtained by anion metathesis from [Tb(CH3COO)2(C22H26N6)] (CH3COO)·4H2O and K2CrO4 in aqueous solution. The compound crystallizes in the triclinic space group $$P\bar 1$$ witha=8.384(2),b=10.425(2)c=15.752(2)Å, α=98.82(2), β=93.52(2), γ=97.22(2)°, andZ=2. The structure is ionic and consists of a (+1) complex cation balanced in a 2∶1 ratio by a disordered dichromate ion. The 9-coordinate Tb(III) is linked to the six nitrogen atoms of the macrocyclic ligand L=C22H26N6, as well as to a water molecule and a bidentate chelating chromate situated on opposite sides of the macrocycle. The infrared spectrum shows, in addition to the pattern of the macrocyclic ligand, the absorptions arising from the stretching modes of the bidentate chelating CrO4 2− ligand and of the Cr2O7 2− counterion.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01796062

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6

Digitale Medien

Magmatic evolution of the Easter microplate-Crough Seamount region (South East Pacific) (1995)

Hekinian, Roger ; Stoffers, Peter ; Akermand, Dietrich ; [weitere]

Springer

Marine geophysical researches 17 (1995), S. 375-397

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ISSN: 1573-0581

Schlagwort(e): Petrology ; structure ; volcanism ; microplate

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract The Easter microplate-Crough Seamount region located between 25° S–116° W and 25° S–122° W consists of a chain of seamounts forming isolated volcanoes and elongated (100–200 km in length) en echelon volcanic ridges oriented obliquely NE (N 065°), to the present day general spreading direction (N 100°) of the Pacific-Nazca plates. The extension of this seamount chain into the southwestern edge of the Easter microplate near 26°30′ S–115° W was surveyed and sampled. The southern boundary including the Orongo fracture zone and other shallow ridges (〈 2000 m high) bounding the Southwest Rift of the microplate consists of fault scarps where pillow lava, dolerite, and metabasalts are exposed. The degree of rock alternation inferred from palagonitization of glassy margins suggests that the volcanic ridges are as old as the shallow ridges bounding the Southwest Rift of the microplate. The volcanics found on the various structures west of the microplate consist of depleted (K/Ti 〈 0.1), transitional (K/Ti = 0.11−0.25) and enriched (K/Ti 〉 0.25) MORBs which are similar in composition to other more recent basalts from the Southwest and East Rifts spreading axes of the Easter microplate. Incompatible element ratios normalized to chondrite values [(Ce/Yb)N = 1−2.5}, {(La/Sm)N = 0.4−1.2} and {(Zr/Y)N = 0.7−2.5} of the basalts are also similar to present day volcanism found in the Easter microplate. The volcanics from the Easter microplate-Crough region are unrelated to other known South Pacific intraplate magmatism (i.e. Society, Pitcairn, and Salas y Gomez Islands). Instead their range in incompatible element ratios is comparable to the submarine basalts from the recently investigated Ahu and Umu volcanic field (Easter hotspot) (Scientific Party SO80, 1993) and centered at about 80 km west of Easter Island. The oblique ridges and their associated seamounts are likely to represent ancient leaky transform faults created during the initial stage of the Easter microplate formation (≈ 5 Ma). It appears that volcanic activity on seamounts overlying the oblique volcanic ridges has continued during their westward drift from the microplate as shown by the presence of relatively fresh lava observed on one of these structures, namely the first Oblique Volcanic Ridge near 25° S–118° W at about 160 km west of the Easter microplate West Rift. Based on a reconstruction of the Easter microplate, it is suggested that the Crough seamount (〈 800 m depth) was formed by earlier (7–10 Ma) hotspot magmatic activity which also created Easter Island.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01227041

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7

Digitale Medien

Large-scale structure of magnetospheric plasma (1995)

Moore, T. E. ; Delcourt, D. C.

Springer

Surveys in geophysics 16 (1995), S. 363-387

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ISSN: 1573-0956

Schlagwort(e): Magnetosphere ; plasma ; structure ; entry boundary ; geopause ; region-1 vortices ; lowenergy layer ; adiabacity boundary ; injection port

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract Recent investigations of magnetospheric plasma structure are summarized under the broad categories of empirical models, transport across boundaries, formation, and dynamics of the plasma sheet. This report reviews work in these areas during the period 1991 to 1993. Fully three-dimensional empirical models and simulations have become important contributors to our understanding of the magnetospheric system. Some new structural concepts have appeared in the literature: the ‘entry boundary’ and ‘geopause’, the plasma sheet ‘region 1 vortices’, the ‘low-energy layer’, the ‘adiabaticity boundary’ or ‘wall region’, and a region in the tail to which we refer as the ‘injection port’. Traditional structural concepts have also been the subject of recent study, notably the plasmapause, the magnetopause, and the plasma sheet. Significant progress has been made in understanding the nature of plasma sheet formation and dynamics, but the acceleration of electrons to high energy remains somewhat mysterious.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01044573

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8

Digitale Medien

Numerical strain analysis using polar coordinate transformations (1976)

Hirsinger, V.

Springer

Mathematical geology 8 (1976), S. 183-202

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ISSN: 1573-8868

Schlagwort(e): Fourier analysis ; paleontology ; structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Mathematik

Notizen: Abstract A system of strain analysis based on the application of a homogeneous strain transformation in plane polar coordinates to match deformed shapes of the same initial form is described. Two types of transformation are derived. A simple transformation between the deformed and the undeformed states, used to compare deformed shapes with a predetermined initial configuration, is recorded in the form of a plane polar coordinate Fourier series. This method allows reliable strain estimates to be made from single specimens of a fossil in an area where sufficient consistency of original shape has been established. A transformation describing the difference in relative strain between local polar coordinate systems in the same overall homogeneous deformation field, is used to compare the members of a group of deformed shapes with one another. This transformation allows the determination of the optimum initial ‘mean shape’of a group of fossils in a deformed rock as well as giving a strain measurement. The use of parabolic integration enhances the determination of the Fourier descriptions, and allows the use of irregularly spaced data. Inherent mathematical features of the method provide controls on the accuracy of the determination. The relatively mechanical nature of the input and the general form of the solution make the method readily applicable in semiautomated systems.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01079034

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9

Digitale Medien

Delineation and analysis of clusters in orientation data (1976)

Shanley, R. J. ; Mahtab, M. A.

Springer

Mathematical geology 8 (1976), S. 9-23

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ISSN: 1573-8868

Schlagwort(e): cluster analysis ; statistics ; numerical taxonomy ; structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Mathematik

Notizen: Abstract This paper presents a technique for (1) clustering orientation data with minimum constraint on resulting partitions, and (2) testing clusters against a probability distribution defined on the unit sphere which admits elliptical symmetry about its mean. The use of an objective function to highlight certain features of the data is discussed. The technique for delineation and analysis of clusters is applied to an example problem through use of a computer code.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01039681

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10

Digitale Medien

Graph theory and digitization of geological maps (1976)

Bouillé, F.

Springer

Mathematical geology 8 (1976), S. 375-393

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ISSN: 1573-8868

Schlagwort(e): digitization ; graphics ; mapping ; plotting ; data bank ; stratigraphy ; structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Mathematik

Notizen: Abstract A method is presented which describes rational digitization and efficient treatment of a geologic map. An oriented graph, S,the arcs of which are associated with stratigraphic boundaries and imply a difference in the topological nature of the map if it includes faults, is used. From S,we deduce other graphs: a dendrogram which is used to structure the data and a graph which summarizes the geologic properties of the map. This structure is useful for graphic reconstitutions on a plotter or screen, and for quantitative correlation and calculation of dips, surfaces, and volumes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01028978

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