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  • Articles  (10,215)
  • Springer  (3,916)
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  • Articles  (10,215)
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  • 1
    Electronic Resource
    Electronic Resource
    The crystal structure of LiBr·(CH3OCH2CH2OCH3)2 (1984)
    Springer
    Journal of chemical crystallography 14 (1984), S. 29-34 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of LiBr·(CH3OCH2CH2OCH3)2 has been determined from counter data and refined by full-matrix least-squares techniques. The crystals belong to the monoclinic space groupC2/c (C 2h 6 , No. 15) witha=13.518(4),b=8.007(3),c=12.252(4) Å,β=98.08(2)°, andD calc=1.35 gcm−3 forZ=4. The finalR value for 489 observed reflections is 0.033. The lithium and bromine atoms lie on a crystallographic two-fold axis. The structure consists of discrete LiBr·(CH3OCH2CH2OCH3)2 units. The Li-Br separation is 2.57(1) Å. The two DME molecules are coordinated to the lithium atom through the four oxygen atoms at an average Li⋯O separation of 2.09(3) Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161420
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and structure of (η5-C5H5)2Hf(η1-NC4H4)2 (1984)
    Springer
    Journal of chemical crystallography 14 (1984), S. 21-28 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of (η5-C5H5)2Hf(η1-NC4H4)2 has been determined from X-ray data measured by counter methods. The title compound is isostructural with (η5-C5H5)2Zr(η1-NC4H4)2, and crystallizes in the monoclinic space groupP21/c (C 2h 5 , No. 14) with unit cell constantsa=9.605(3),b=8.174(3),c=19.487(4) Å, β=90.85(3)°, andZ=4 forD c=1.91 gcm−3. Full-matrix least-squares refinement gave a finalR value of 0.068 for 2154 independent observed reflections. The two cyclopentadienyl rings are η5-coordinated to the hafnium atom at an average Hf-C(η5−) distance of 2.51(1) Å. The Hf-N-centroid (σ-pyrrolyl) angles average 166°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161419
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of 1,N6-ethenoadenosine hydrochloride (1984)
    Springer
    Journal of chemical crystallography 14 (1984), S. 45-57 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The X-ray structure of 1,N 6-ethenoadenosine hydrochloride, C12H14N5O4Cl, has been determined from three-dimensional diffractometer data and refined by full-matrix least-squares techniques. The crystals are monoclinic:P21 No. 14,a=6.1540(5),b=18.511(1),c=6.7412(4) Å,β=112.602(5)°,andZ=2; finalR=0.045 for 2662 observed reflections. The crystal and molecular structure of ∈ Ado·HC1 is very similar to that of Ado·HC1. On the other hand, the dimensions and conformation of the ∈ Ado·H+ cation are drastically different from those of Et ∈ Ado·H+. The ∈ adenosine·H+ moiety is not planar but has an S shape. The ribose is 2′-endo-3′-exo puckered, with ag + side chain; the glycosidic torsion angle is in theanti region. The structure contains a three-dimensional network of H bonds in which also C-H⋯A interactions seem to play an important role. There is no base stacking in the structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161422
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  • 4
    Electronic Resource
    Electronic Resource
    N,N′-(1,2-phenylene)bis(pyridoxal-hydrochlorideiminato)copper(II): crystallographic and spectroscopic studies (1984)
    Springer
    Journal of chemical crystallography 14 (1984), S. 129-142 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract (C22H22CuN4O4Cl2 2·7H2O is triclinic,C i− 1 t-P1. Unit cell dimensions at 293 K area=12.028(3),b=20.378(6),c=11.387(3) Å, α=113.10(2),β=84.13(2), γ=95.99(2)°,V=2547.5 0A3,D c =1.573 Mg. m−3, andZ=2. The structure has been determined from single-crystal data collected with a four-circle diffractometer and refined from 3904 reflections down toR=0.054 andR w =0.058. The asymmetric unit is built from two independent A and B molecules in which the copper atom has a square pyramidal environment in A and an octahedral one inB. Intermolecular Cu-O (hydroxymethyl groups) contacts observed in the solid state are partially present in aqueous solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189555
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  • 5
    Electronic Resource
    Electronic Resource
    Stacking interactions in the acridine dyes: spectrophotometric data and crystal structure of acridine orange hydroiodide and acridine orange hydrochloride monohydrate (1984)
    Springer
    Journal of chemical crystallography 14 (1984), S. 71-87 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of acridine orange hydroiodide and that of acridine orange hydrochloride monohydrate have been solved by X-ray diffraction analysis. The absorption spectra of both derivatives in the solid state have also been reported and compared with those of the acridinium ion in solution. The stacking interactions of the acridine orange molecule in both derivatives is discussed in the light of the visible absorption spectra in the solid state and in solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161424
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  • 6
    Electronic Resource
    Electronic Resource
    D-β,β-dimethylcysteic acid, its preparation, structure, and spectroscopic properties (1984)
    Springer
    Journal of chemical crystallography 14 (1984), S. 59-70 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The X-ray crystal structure ofd-β,β-dimethylcysteic acid, C5H11NO5S, has been determined. The compound is monoclinic, space groupP214 (No. 4), with cell dimensionsa=8.133(1),b=8.094(1),c=6.3138(7) Å,β=96.36(1)° andZ=2. The structure was solved by Patterson and electron density difference methods and refined toR=0.025,R w=0.022 for 1081 reflections. Bond lengths and angles do not differ from those in similar structures. The crystal is held together by intermolecular hydrogen bonds. The vibrational spectra have been recorded and assigned and the1 H and13C NMR spectra were measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161423
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  • 7
    Electronic Resource
    Electronic Resource
    The crystal and molecular structure of [K·DB-18-C-6][AlMe3NO3]·0.5C6H6 (1984)
    Springer
    Journal of chemical crystallography 14 (1984), S. 1-11 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The use of dibenzo-18-crown-6 in the synthesis of trimethylaluminum adducts of KNO3 results in the formation of a 1/1 adduct, [K·DB-18-C-6]-[AIMe3NO3]. The crystal structure of [K·DB-18-C-6][AlMe3NO3]-has been determined from single-crystal X-ray diffraction data collected by counter methods. The title compound crystallizes in the monoclinic space groupP21/c (No. 14) with unit cell parametersa=11.804(3),b=28.828(4),c=9.118(3) Å, β=96.61(3)°, andD calc=1.23 forZ=4. Least-squares refinement gave a final conventionalR value of 0.045 for 983 independent observed reflactions. The potassium atom is centered among the six oxygen atoms of the crown at an average K⋯O contact of 2.74(2) Å. Its environment is completed by an oxygen atom of a nitrate anion (2.88 Å) and a benzo group (〉3.44 Å) of a neighboring crown ether. The trimethylaluminum moeity is coordinated to the nitrate anion by an oxygen atom at an Al-O bond distance of 1.92(1) Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161417
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  • 8
    Electronic Resource
    Electronic Resource
    The crystal structure of 5-methyl-1-(octahydro-1-iodo-1H-1-inden-4-yl)-1H-tetrazole (1984)
    Springer
    Journal of chemical crystallography 14 (1984), S. 13-20 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The title compound is C11H17N4I, F.W.=330.20, monoclinic, space groupP21/a,a=11.586(2),b=10.617(1),c=10.417(1) Å, β=94.567(2)°,Z=4,F(000)=652, λ(MoKα)=0.7107 Å, μ(MoKα)=2.31 mm−1,V=1277.31 Å3,D C=1.71 gcm−3,D m=1.70 gcm−3. The structurewassolved by Patterson and Fourier methods and refined to anR value 0.031 for 1620 observed reflections. The connectivity and conformation of the addition product ofcis-1,5-cyclononadiene and iodine azide was determined by X-ray analysis. The reaction product contains a chair-conformation cyclohexane ring that iscis fused to a cyclopentane ring. The cyclopentane ring has an envelope conformation and an equatorially oriented iodine substituent. A planar tetrazole ring is axially substituted on the cyclohexane ring. The plane of the tetrazole ring makes a dihedral angle of 69.6° with the average plane of the carbon atoms of the cyclohexane ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161418
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  • 9
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of reductiomycin (1984)
    Springer
    Journal of chemical crystallography 14 (1984), S. 35-43 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Conflicting results concerning the structure of the antitumor agent reductiomycin have been resolved. When the imino group and the heterocyclic oxygen atom of a previous x-ray study are interchanged, and this structure refined, it is found that: (i) a structure with satisfactory hydrogen bonding results, (ii) there are no unacceptably small nonbonded intermolecular distances, and (iii) agreement with two recent structure formulations based on various kinds of chemical and spectral evidence is achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161421
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  • 10
    Electronic Resource
    Electronic Resource
    Crystal structure of 3,3-(p-N,N-dimethylaminophenyl)-6-N,N-dimethylaminophthalide, (crystal-violet lactone) (1984)
    Springer
    Journal of chemical crystallography 14 (1984), S. 121-128 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The title compound is C26H29N302,M r ,=415.54, monoclinic,P21/n,a=12.228(1),b=17.385(2),c=11.786(1) Å,V c =2308.7 Å3,Z=4,D x =1.19 Mg m−3,μ=5.29 cm−1,F(000)=888. FinalR=0.046 for 2301 independent reflections. Three cyrstallographically distinct nitrogens were found, with the molecule possessing the expected propeller shape.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189554
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