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  • Artikel  (71)
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  • Springer  (71)
  • American Chemical Society
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  • 1
    Digitale Medien
    Digitale Medien
    The crystal and molecular structure of N-(methylsulfonyl)-N-(2,6)-(dimethylphenyl)methanesulfonamide (1994)
    Springer
    Journal of chemical crystallography 24 (1994), S. 759-762 
    Details
    ISSN: 1572-8854
    Schlagwort(e): Sulfonamide ; methanesulfonanilide ; crystal structure ; molecular structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The title compound, crystallizes in the triclinic space group $$P\bar 1$$ witha=8.232(4),b=9.159(2),c=10.230(3)Å. α=74.07(3)°, β=72.50(4)°, γ=63.65(3)° andZ=2. The structure was solved by direct methods and refined by full matrix least squares methods toR=0.054 for 1817 observed reflections. The plane containing the nitrogen and sulfur atoms is perpendicular to the aromatic plane. One of the S−O bonds in each methanesulfonyl group is in nearly eclipsed conformation with the N−C bond.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01666966
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  • 2
    Digitale Medien
    Digitale Medien
    The crystal structure of calcium succinate monohydrate (1994)
    Springer
    Journal of chemical crystallography 24 (1994), S. 437-440 
    Details
    ISSN: 1572-8854
    Schlagwort(e): Ca(C4H4O4)·H2O ; pentagonal pyramid ; calcium succinate ; crystal structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The crystal structure of calcium succinate monohydrate, Ca(C4H4O4)·H2O, has been determined by single crystal X-ray diffraction. The crystals are monoclinic witha=11.952(2),b=9.691(2),c=11.606(2)Å, β=108.81(1)°, space group C2/c,Z=8,V=1272.49 Å3,d m =1.80, andd c =1.818 Mg m−3. The structure was refined by full-matrix least-squares techniques toR=0.027,R w =0.040, for 829 reflections with1≥3δ(I). Ca is coordinated to seven oxygen atoms, and the coordination polyhedron is best described as a pentagonal bipyramid. One carboxylate group in the succinate ion is bonded to three different Ca ions, forming a four-membered chelate ring with one Ca ion is bonded to three different Ca ions, forming a four-membered chelate ring with one Ca ion and unidentate bridge bonds to two other Ca ions. The other carboxylate group is bonded to two Ca ions through unidentate bonds. The structure is highly polymeric. The general structural features are nearly identical to those of calcium adipate monohydrate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01666091
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  • 3
    Digitale Medien
    Digitale Medien
    Synthesis and structure of tetrakis(2,6-dichlorophenoxide) bis(THF) uranium(IV) (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 7-10 
    Details
    ISSN: 1572-8854
    Schlagwort(e): crystal structure ; uranium (IV) ; dichlorophenoxide
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The reaction of UCl4 with KO-2,6-Cl2C6H3 in tetrahydrofuran results in the preparation of the title compound. The six-coordinate complex possesses pseudo-octahedral geometry about uranium, with U-O(phenoxide) bond lengths in the range 2.161(11) to 2.178(10) Å and U-O(THF) bond lengths of 2.467(10) and 2.475(11) Å. This complex crystallizes in the monoclinic space group P21/n (a = 11.169(2), b = 11.588(2), c = 35.119(5) Å, β = 92.11(1)°, V = 4542.2(13) Å3, and Z = 4).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009594612946
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  • 4
    Digitale Medien
    Digitale Medien
    Synthesis and crystal structure of hexakis(N-methylimidazole) iron(II) pyridine-2-sulfonate (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 23-26 
    Details
    ISSN: 1572-8854
    Schlagwort(e): iron ; crystal structure ; synthesis ; N-methylimidazole
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The compound [Fe(C4H6N2)6][C5H4NSO3]2 crystallized in the monoclinic space group, P21/n with unit cell parameters: a = 13.676(3), b = 8.345(2), c = 18.663(4) Å, β = 106.40(3)° and Z = 2. The title compound consists of a [Fe(C4H6N2)6]+2 hexacoordinated iron(II) cation and two C5H4NSO− 3 anions. In the cation the iron atom is coordinated to six N-methylimidazole imine nitrogen atoms in a distorted octahedral arrangement. The N1,N5,N1i,N5i atoms are coplanar and the iron lies in this plane.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009537830693
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  • 5
    Digitale Medien
    Digitale Medien
    Crystal structure of [Cu2(II)(dmpa)2(p-Cl-C6H5COO)2] (Hdmpa = N,N-dimethyl-3-amino-1-propanol) (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 35-38 
    Details
    ISSN: 1572-8854
    Schlagwort(e): copper(II) ; aminoalcoholato ; hydrogen bonding ; crystal structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The copper complex, [Cu2(II)(dmpa)2(p-Cl-C6H5COO)2], has been prepared and its structure determined using X-ray crystallography. The dimer is a di-μ2-alkoxo complex which is a five-coordinate copper dimer with unsupported alkoxo bridges. The complex crystallizes in the triclinic space group P-1 with a = 11.384(2), b = 14.636(5), c = 9.609(2) Å, α = 100.07(2), β = 104.33(3), γ = 72.79(2)°, V = 1471.8(7) Å3, and Z = 2. The structure is comprised of discrete binuclear clusters in which the metal atoms are bridged by two alkoxo oxygens of the dmpa− ligands. The Cu-O and Cu-N distances are in good agreement with those found for other copper(II) aminoalcoholato complexes. The Cu···Cu distance is 2.9765(6) Å. In the crystal, every two dimeric coordination molecules are combined together by the recognition through intermolecular hydrogen-bonding interactions between the apical water molecule and the non-coordinated O atom from the p-chlorobenzoato ligand, forminga tetramer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009542031602
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  • 6
    Digitale Medien
    Digitale Medien
    Synthesis and crystal structure of manganese(III) hydroxyl-containing Schiff base complexes: [Mn(III)(Hvanpa)2]N3 (H2vanpa = 1−(3-hydroxysalicylaldeneamino)-3-hydroxypropane) (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 39-42 
    Details
    ISSN: 1572-8854
    Schlagwort(e): manganese(III) ; Schiff base ; hydrogen bonding ; crystal structure ; Jahn-Teller distortion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The manganese complex, [Mn(III)(Hvanpa)2]N3 has been prepared and the crystal structure determined using x-ray crystallography. The mononuclear complex has a six-coordinate octahedral geometry. The complex crystallizes in the monoclinic space group P21/c with a = 9.867(1), b = 13.316(2), c = 9.0110(1) Å, β = 107.870(1)°, V = 1126.8(2) Å3, and Z = 2. The Mn-O and Mn-N distances in the equatorial plane are in good agreement with those found for other manganese(III) Schiff base complexes. In the axial direction, the Mn-O distances of 2.274(2) Å is about 0.3 Å longer than those in the equatorial plane due to a Jahn-Teller distortion at the d4 manganese(III) center. In the crystal, each azido ion is linked through hydrogen bonding with two hydrogen atoms from the coordinate hydroxyl groups at the apical site.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009594015672
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  • 7
    Digitale Medien
    Digitale Medien
    Preparation, characterization and crystal structure of an intermolecular compound based on H3PMo12O40·nH2O and diethylamine (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 43-48 
    Details
    ISSN: 1572-8854
    Schlagwort(e): molybodophosphoric acid ; crystal structure ; diethylamine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract An intermolecular compound, H3PMo12O40·5(CH3CH2)2NH·H2O, between the heteropolymolybdate α-H3PMo12O40 and the organic substrate diethylamine, has been synthesized and characterized. Light yellow crystals of the title compound were crystallized from a mixed solvent of water and acetonitrile with formula H3PMo12O40·5(CH3CH2)2NH·H2O. Spectroscopic data support the presence of a sizable electronic interaction between the organic substrate and the inorganic anion in the solid state. The single crystal x-ray structure analysis of the title compound revealed that it crystallized in the triclinic system, space group P $$\overline 1$$ with a = 12.0786(13), b = 12.102(5), c = 21.416(3) Å, α = 94.87(2), β = 94.755(9), γ = 113.81(2)°, V = 2830.3(13) Å3, and Z = 2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009546132511
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  • 8
    Digitale Medien
    Digitale Medien
    Synthesis and crystal structure of K3Sb4BO13 (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 53-53 
    Details
    ISSN: 1572-8854
    Schlagwort(e): boroantimonate ; borate ; antimonate ; crystal structure ; 49
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract K3Sb4BO13, Mr = 823.11 g.mol−1, crystallizes in the triclinic system, space group P $$\overline 1$$ , Z = 2. The lattice parameters are a = 7.133(1) Å, b = 7.232(1) Å, c = 13.259(2) Å, α = 82.00 (1)°, β = 99.77(1)° and γ = 117.08(1)°, V = 598.7(2) Å3, Dx = 4.566 Mg m−3. The final R index and weighted Rw index are 0.0251 and 0.0623, respectively. The three-dimensional network of the title compound is constituted by layers (Sb3O9)n, similar to that of hexagonal bronze of Magneli. These layers are linked together, in the c direction, alternatively by edge-sharing pairs of SbO6 octahedra and BO3 triangles. This framework has interconnected tunnels, running approximately along the a and b directions, in which the K+ ions are located.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009598116581
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  • 9
    Digitale Medien
    Digitale Medien
    Crystal structure of a (25R)-2α,3α-epoxy-5α-spirostan-6, 23-dione hemi-ethyl acetate solvate (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 693-697 
    Details
    ISSN: 1572-8854
    Schlagwort(e): brassinosteroids ; steroids ; natural products ; crystal structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The compound (25R)-2α,3α-epoxy-5α-spirostan-6,23-dione, crystallizes as a hemi-ethyl acetate solvate, having two host molecules of similar conformation per molecule of ethyl acetate, in the asymmetric unit. The O atom of the epoxy group is α-oriented. The presence of the epoxy group disturbs the chair conformation in the ring A of the steroidal nucleus. Ring A has a C5α,C10β half-chair conformation. The six-membered rings B, C, and F have chair conformation as expected. The D ring adopts a C14α-envelope conformation and the E ring is midway between a C22α,O3β half-chair and a C22α-envelope conformations. The A/B, B/C, and C/D ring junctions are trans. Crystal data: C27H38O5·1/2C4H8O2, Monoclinic, space group P21, a = 7.7363(18) b = 28.769(12) c = 12.038(6) Å, β = 90.88(5), V = 2679.0(10) Å3, Z = 4. The packing of the molecules is assumed to be dictated by van der Waals interactions and by intermolecular C—H ··· O hydrogen bonds.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1012277425969
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  • 10
    Digitale Medien
    Digitale Medien
    X-ray crystal structure of trans-bis(monoethanolamine) bis(saccharinato)nickel(II) (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 767-771 
    Details
    ISSN: 1572-8854
    Schlagwort(e): saccharin ; monoethanolamine ; nickel(II) complex ; hydrogen bonding ; crystal structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The crystal structure of trans-bis(monoethanolamine)bis(saccharinato)nickel(II), [Ni(C7H4NO3S)2(C2H7NO)2], has been determined from X-ray diffraction data. The metal complex is monoclinic, with a = 11.0555(5), b = 8.9103(4), c = 11.3890(5) Å, β = 105.0230(10)°, Z = 2, and space group P21/c . The structure consists of individual molecules. Two monoethanolamine molecules and two saccharinate anions coordinate the nickel atom forming a distorted octahedron. The monoethanolamine molecules act as a bidentate ligand and form five-membered trans chelate rings, which constitute the plane of the coordination octahedron, while two saccharinate ions behave as a monodentate ligand occupying the axial positions. Intermolecular hydrogen bonds link the molecules to form a three-dimensional infinite structure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1013292406687
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