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  • 1
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] We identified the gene underlying Marinesco-Sjögren syndrome, which is characterized by cerebellar ataxia, progressive myopathy and cataracts. We identified four disease-associated, predicted loss-of-function mutations in SIL1, which encodes a nucleotide exchange factor for the heat-shock ...
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  • 2
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    In:  Bull. Seism. Soc. Am., Hannover, Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 90, no. 1, pp. 151-165, pp. L03607
    Publication Date: 2000
    Keywords: Seismology ; Seismic networks ; Array configur. ; CTBT ; Nuclear explosion ; BSSA
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  • 3
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    In:  Pageoph, Luxembourg, Conseil de l'Europe, vol. 159, no. 5, pp. 945-967, pp. B02405, (ISSN: 1340-4202)
    Publication Date: 2002
    Keywords: Data analysis / ~ processing ; Seismology ; Location ; Earthquake catalog ; Nuclear explosion ; PAG ; Horin
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  • 4
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 435 (1977), S. 119-126 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Raman Spectra of the System SnBr2—CsBr in the Solid and Molten StateRaman spectra of crystalline and molten SnBr2 as well as of molten SnBr2—CsBr mixtures were measured. In molten SnBr2 polymeric chains with similar structural elements as in solid SnBr2 will be formed. Temperature rising causes a heterolytic disruption into smaller but still polymeric units of varying chain length. Equilibrium fragmentation reactions occur by bromide ion addition. In bromide rich SnBr2—CsBr melts (Br-/Sn2+ ratio 3-6) Sn2Br5-, SnBr3- and Br- ions exist with Sn2Br5- species predominating.
    Notes: Sowohl polykristallines und geschmolzenes SnBr2 als auch SnBr2—CsBr-Schmelzen wurden ramanspektroskopisch untersucht. Beim Übergang vom festen in den flüssigen Zustand entstehen beim SnBr2 polymere Ketten mit den Strukturelementen des festen SnBr2. Temperaturerhöhung bewirkt eine heterolytische Spaltung in kleinere, aber immer noch polynukleare Kettenbruchstücke. Bei Br--Zugabe erfolgen Gleichgewichtsabbaureaktionen. In Br--reichen SnBr2—CsBr-Schmelzen (Br-/Sn2+-Verhältnis 3-6) liegen hauptsächlich Sn2Br5--Spezies neben SnBr3-- und Br--Ionen vor.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 476 (1981), S. 153-158 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vibrational Spectra of β-P4S5 and P4S7The vibrational spectra of the solid and liquid cage compounds β-P4S5 and P4S7 have been recorded. The assignments of the frequencies are proposed mainly based on polarization data. β-P4S5 decomposes during melting into P4S3 α-P4S7 and β-P4S6. Molten α-P4S7 dissociates to some extent into β-P4S6 and sulphur. An association of β-P4S6 with α-P4S7 is discussed for the molten state. All reactions in molten P4S7 are reversible.
    Notes: Die Schwingungsspektren der käfigstrukturierten Verbindungen β-P4S5 und P4S7 wurden für den kristallinen und flüssigen Zustand aufgenommen. Die Zuordnung der Schwingungsfrequenzen wird, vor allem basierend auf Polarisationsdaten, vorgeschlagen. β-P4S5 zerfällt in der Schmelze in P4S3 α-P4S7 und β-P4S6. α-P4S7 schmilzt unter partieller Dissoziation in β-P4S6 und S. Für β-P4S6, wird eine Assoziatbildung mit α-P4S7 in der Schmelze diskutiert. Die Vorgänge im geschmolzenen P4S7 sind reversibel.
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  • 7
    ISSN: 0044-2313
    Keywords: Antimonide triantimonidometallates(III) ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Antimonide Triantimonidometallates(III) Cs6K3Sb[AlSb3] and Cs6K3Sb[GaSb3]The novel compounds Cs6K3Sb[AlSb3] and Cs6K3Sb[GaSb3] are formed from stoichiometric mixtures of Cs, AlSb (GaSb) and KSb in sealed niobium ampoules at 950 K. The hexagonal structures are especially characterized by one-dimensional rod packings 1∞[Cs6K3Sb] which are formed from columns of condensed (Cs6K6/2) icosahedra. The icosahedra are centered by Sb3-- anions. The trigonal planar anions [AlSb3]6-- and [GaSb3]6-- are embedded between the icosahedra columns, and they are coordinated by alkali metal atoms. The FIR spectra were assigned to the vibrations of the [MSb3]6-- anions, with respect to the 6m2-D3h symmetry.(P63/mmc, No. 194; a = 1101.7 and 1097.2 pm; c = 1158.9 and 1150.1 pm; Z = 2; Single crystal data: 574 and 546 reflections; R = 0.073 and 0.029. Distances:d(Al—Sb) = 265.4 pm; d(Ga—Sb) = 265.1 pm; d(Sb—Cs) = 401.6-423.0 pm; d(Sb—K) = 358.6-367.3 pm).
    Notes: Die neuen Verbindungen Cs6K3Sb[AlSb3] und Cs6K3Sb[GaSb3] entstehen aus stöchiometrischen Gemischen von Cs, AlSb (GaSb) und KSb in verschweißten Niob-Ampullen bei 950 K. Besonderes Merkmal der hexagonalen Strukturen sind eindimensionale Stabpackungen 1∞[Cs6K3Sb], gebildet aus Säulen kondensierter (Cs6K6/2)-Ikosaeder. Die Ikosaeder sind von Sb3---Anionen zentriert. Zwischen den Ikosaedersäulen sind die trigonal-planaren Anionen [AlSb3]6-- bzw. [GaSb3]6-- eingebettet. Sie werden durch die Alkalimetallatome koordiniert. Die FIR-Spektren können den Schwingungen der Anionen [MSb3]6-- mit der Symmetrie 6m2-D3h zugeordnet werden.(P63/mmc, Nr. 194; a = 1101,7 bzw. 1097,2 pm; c = 1158,9 bzw. 1150,1 pm; Z = 2; Einkristalldaten: 574 bzw. 546 Reflexe; R = 0,073 bzw. 0,029. Abstände: d(Al—Sb) = 265,4 pm; d(Ga—Sb) = 265,1 pm; d(Sb—Cs) = 401,6-423,0 pm; d(Sb—K) = 358,6-367,3 pm).
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  • 8
    ISSN: 0044-2313
    Keywords: Polyphosphides ; Zintl-phases M3X11 (M = Na, K, Rb, Cs; X = P, As) ; P113-, As113- cage anion ; preparation ; vibrational spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry and Structural Chemistry of Phosphides and Polyphosphides. 53. Preparation, Properties, and Vibrational Spectra of the Cage Anions P113- and As113-The Zintl-phases M3X11 (M = Na, K, Rb, Cs; X = P, As) are prepared from the elements or from M3X7 and X. The compounds undergo a first-order phase transition from the crystalline to the plastically crystalline state. Unit cell and space group of both modifications and the transition temperature Tc are determined. The vibrational spectra of the crystalline compounds and the Raman spectrum of the P113- anion in en-solution as well are measured. The assignment of the frequencies is given, based on the 32-D3 symmetry of the X113- cage anion. Normal coordinate analysis is carried out in terms of Cartesian coordinates to avoid the problem of redundancies in using internal coordinates. The force constants [mdyn Å-1] obtained for the characteristic bonds r, s, and t are: fppr = 1.34, fpps = 1.20, fppt = 1.08; fAsAsr = 1.1, fAsAss = 0.91. Normal vibrations and the potential energy distribution (PED) are discussed.
    Notes: Die Zintl-Phasen M3X11 (M = Na, K, Rb, Cs; X = P, As) werden aus den Elementen oder aus M3X7 und X synthetisiert. Die Verbindungen durchlaufen einen Phasenübergang 1. Ordnung vom kristallinen zum plastisch-kristallinen Zustand. Elementarzelle und Raumgruppe beider Modifikationen sowie Übergangstemperaturen Tc wurden bestimmt. Die Schwingungsspektren der kristallinen Verbindungen sowie das Raman-Spektrum des Anions P113- in en-Lösung wurden gemessen. Die Zuordnung der Schwingungsfrequenzen gelingt auf der Basis der Symmetrie 32-D3 der Käfiganionen X113-. Die Normalkoordinatenanalyse erfolgte in kartesischen Koordinaten, wodurch das in inneren Koordinaten auftretende Redundanzproblem vermieden wird. Auf diesem Wege erhaltene Kraftkonstanten [mdyn Å-1] der charakteristischen Bindungen r, s und t sind: fppr = 1, 34, fpps = 1, 20, fppt = 1, 08; fAsAsr = 1, 1, fAsAss = 0, 96, fAsAst = 0, 91. Die Normalschwingungen und die Verteilung der potentiellen Energie (PED) werden diskutiert.
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  • 9
    ISSN: 0044-2313
    Keywords: Ba3Ge4C2 ; Zintl Phase ; tetrahedro-Tetragermanide [Ge4]4- Anions ; Acetylenide [C2]2- Anions ; Vibrational Spectra ; Force Constants ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tribarium tetrahedro-Tetragermanid- Acetylenid, Ba3[Ge4][C2] - Synthese, Struktur und EigenschaftenBa3Ge4C2 bildet sich aus den Elementen order durch die Umsetzung von BaC2 mit BaGe2 bei 1530 K (korundtiegel in geschlossener Stahlampulle). Die Verbindung ist ein Halbleiter (grau; Eg = 1.1 eV), spröde, und sehr feuchtigkeitsempfindlich. Sie reagiert mit NH4Cl bei ca. 400 K unter Bildung von Acetylen und Germanen bis Ge4Hn. Der neue Ba3Ge4C2-Strukturtyp (Raumgruppe I4/mcm, No. 140; a = 8.840(1) Å, c = 12.466(1) Å; Z = 4, Pearsonsymbol tI36) enthält zwei isolierte Polyanionen, nämlich Tetrahedro-tetragermanid [Ge4]4- und Acetylenid [C2]2-. Die Bindungslängen betragen d(Ge—Ge) = 2.517 Å (4×) bzw. 2.641 Å (2x) und d(C≡C) = 1.20 Å. Die Struktur von Ba3[Ge4][C2] ist durch Atom/Cluster-Substitutionen ([Ge4] statt Ca; [C2] statt Ti; Ba statt O) eine hierarchische Variante der Perowskit-Struktur CaTiO3. Das Raman-Spektrum zeigt Banden bei 168, 199 und 280 cm-1 bzw. 1796 cm-1, die für die Polyanionen [Ge4]4- und [C2]2- charakteristisch sind.
    Notes: Ba3Ge4C2 is formed at 1530 K from the elements or by reaction of BaC2 with BaGe2 (corundum crucible; steel ampoule). The compound is a semiconductor (grey colour; Eg = 1.1 eV), brittle, very sensitive to moisture, and reacts with NH4Cl at about 400 K forming acetylene and germanes up to Ge4Hn. The new Ba3Ge4C2 structure type (space group I4/mcm, No. 140; a = 8.840(1) Å, c = 12.466(1) Å; Z = 4, Pearson code tI36), contains two kinds of isolated polyanions, namely tetrahedro-tetragermanide [Ge4]4- and acetylenide [C2]2- anions. The bond lengths are d(Ge-Ge) = 2.517 Å (4×) and 2.641 Å (2×), and d(C≡C) = 1.20 Å. The Ba3[Ge4][C2] structure is a hierarchical derivative of the perovskite (CaTiO3) generated by a partial atom/cluster replacement ([Ge4] for Ca, [C2] for Ti and Ba for O). The Raman spectrum shows bands at 168, 199 and 280 cm-1, and at 1796cm-1 characteristic for [Ge4]4- and [C2]2- polyanions, respectively.
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  • 10
    ISSN: 0044-2313
    Keywords: LiMg[BN2] ; Ba4[BN2]2O ; Nitridoborates ; Linear Anions [BN2]3- ; Crystal Structure ; Vibrational Spectrum ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ternary Nitridoborates. 1. LiMg[BN2] and Ba4[BN2]2O, Compounds with the Anion [N—B—N]3-: Syntheses, Crystal Structures, and Vibrational SpectraLiMg[BN2] and Ba4[BN2]2O were synthesized from stoichiometric mixtures of the binary components Li3N, Mg3N2, BN and BaO, Ba3N2. BN in sealed niobium ampoules at 1575 and 1350 K, respectively. The structures are characterized by isolated anions [N—B—N]3-, packed in different ways (LiMg[BN2]: I4/mmm (No. 139); a = 379.8 pm, c = 891.6 pm, c/a = 2.348; Z = 2; Ba4[BN2]2O; Cmca (No. 64); a = 1575.3 pm, b = 729.1 pm, c = 731.9 pm; Z = 4). The bond lengths and the bond angles are d(B—N) = 133.6 pm and β(N—B—N) = 180° in LiMg[BN2] and d(B—N) = 135 pm and β(N—B—N) = 173.4° in Ba4[BN2]2O, respectively.The vibrational spectra have been interpreted with respect to the D∞h symmetry of the isolated [N—B—N]3- anions, taking into account the slight symmetry reduction to C2v in Ba4[BN2]2O. The calculated valence force constants f(B—N) = 8.16 Ncm-1 and f(B—N) = 7.55 Ncm-1 are discussed and compared with those of other nitridoborates.
    Notes: LiMg[BN2] und Ba4[BN2]2O bilden sich aus stöchiometrischen Gemengen der binären Komponenten Li3N, Mg3N2, BN bzw. BaO, Ba3N2, BN in verschweißten Nb-Ampullen bei 1575 bzw. 1350 K. Die charakteristischen Bauelemente sind isolierte [N—B—N]3- -Anionen, die im Kristall unterschiedlich gepackt sind (LiMg[BN2]: I4/mmm (Nr. 139); a = 379.8 pm, c = 891.6pm, c/a = 2.348; Z = 2; Ba4[BN2]2O: Cmca (Nr.64); a = 1575.3 pm, b = 729.1pm, c = 731.9 pm; Z = 4). Die Bindungslängen und Bindungswinkel betragen d(B—N) = 133.6 pm und β(N—B—N) = 180° in LiMg[BN2] bzw. d(B—N) = 135 pm und β(N-B-N) = 173.4° in Ba4[BN2]2O.Die Schwingungsspektren der Verbindungen wurden auf der Basis der D∞h-Symmetrie der isolierten [N—B—N]3--Anionen unter Berücksichtigung der Symmetrieerniedrigung nach C2v in Ba4[BN2]2O interpretiert. Die aus den gemessenen Frequenzen berechneten Kraftkonstanten f(B—N) = 8.16 bzw. 7.55 Ncm-1 werden diskutiert und mit denen anderer Nitridoborate verglichen.
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