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  • 1970-1974  (15)
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  • 1
    Publication Date: 1971-10-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 2
    Publication Date: 1973-01-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 3
    Publication Date: 1973-07-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 4
  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3266-3274 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of the Pyridine-N-oxide Complexes ZnI2L2, CdI2L and HgCl2L (L = C5H5NO)ZnI2L2 (L = pyridine-N-oxide, C5H5NO) crystallizes in the monoclinic space group P21/c with a = 14.319 Å, b = 13.362 Å, c = 8.192 Å, β = 102.68° and four formula units. The structure consists of discrete monomeric complexes with zinc atoms tetrahedrally bonded to two iodine atoms (ZN—I = 2.56 and 2.58 Å) and two oxygen atoms (Zn—O = 1.98 and 1.99 Å). CdI2L crystallizes in the monoclinic space groupe P21/a with a = 13.337 Å, b = 7.002 Å, c = 11.153 Å, β = 107.87° and four formula units. The structure is composed of infinite chains with units of [CdI] alternately bridged through two iodine atoms and two oxygen atoms. The environment of the penta coordinated Cd-atom corresponds largely to a trigonal bipyramid (Cd—I = 2.724, 2.834, 2.963 2.936 Å; Cd—O = 2.275, 2.383 Å). HgCl2L crystallizes in the triclinic space group P1¯ with a = 7.060 Å, b = 10.132 Å, c = 6.890 Å, α = 105.28°, β = 117.04°, γ = 75.35° and two formula units. The main feature of the structure are bent molecules HgCl2 (Hg—Cl = 2.316, 2.339 Å, β = 163°) held together in a two-dimensional network by markedly weaker mutual interactions and by C5H5NO-molecules (Hg—Cl° = 3.185, 3.318 Å, Hg—O = 2.59, 2.60 Å). Generally there is a layer structure with the atoms Hg, Cl and O in the inner region of the layers which is envelloped by pyridinrings.
    Notes: ZnJ2L2 (L = Pyridin-N-oxid, C5H5NO) kristallisiert monoklin in der Raumgruppe P21/c mit a = 14.319 Å, b = 13.362 Å, c = 8.192 Å, β = 102.68° und Z = 4 Formeleinheiten. Die Struktur wird aus isolierten Komplexen aufgebaut, in denen Zink tetraedrisch an je zwei Jod-bzw. Sauerstoffatome gebunden ist(Zn—J = 2.56 und 2.58 Å; Zn—O = 1.98 und 1.99 Å), CdJ2L kristallisiert monoklin in der Raumgruppe P21/a mit a = 13.337 Å,b = 7.002 Å. c = 11.153 Å, β = 107.87° und Z = 4 Formeleinheiten. Die Struktur enthält eindimensional unendliche Ketten, in denen [CdJ]-Einheiten abwechselnd über je zwei Jod-bzw. Sauerstoffatome verknüpft sind. Jedes Cd-Atom ist fünffach koordiniert, wobei das Koordinations-polyeder weitgehend einer trigonalen Bipyramide entspricht (Cd—J = 2.724, 2.834, 2.963 Å; Cd—O = 2.275, 2.383 Å). HgCl2L Kristallisiert triklin in der Raumgruppe P1¯ mit a = 7.060 Å, b = 10.132 Å, c = 6.890 Å, α = 105.28°, β = 117.04°, γ = 75.35° und Z = 2 Formeleinheiten. Hauptmerkmal der Struktur sind gewinkelte Moleküle HgCl2 (Hg—Cl′ = 2.316 bzw. 2.339 Å, β = 163°), die durch merklich schwächere Wechselwirkungen untereinander und über C5H5NO-Moleküle vernetzt sind (Hg—Cl′ = 3.185 bzw. 3.318 Å; Hg—O = 2.59 bzw. 2.60 Å). Insgesamt liegt ein Schichtengitter vor, wobei die Atome Hg, Cl und O einen inneren Bereich bilden, der durch die Pyridinringe eingehüllt wird.
    Additional Material: 4 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 83 (1971), S. 440-440 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 385 (1971), S. 75-84 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The structure of Hg[Mo6Cli8]Cla6 has been determined with satisfying accuracy by means of powder intensities (100 reflections, R = 0.06) using reduced parameters. The unit cell is cubic with a = 12.706 Å and four formula units, space group Pn3-T2h. The polynuclear anions {[Mo6Cli8]Cla6}2- are regular within the limit of accuracy; the interatomic distances are Mo-Mo = 2.62, Mo-Cli = 2.48, Mo-Cla = 2.50 Å. The centres of gravity of these groups together with the Hg atoms build up a NaCl-type structure (Hg-Cla = 2.56 Å). The structure is discussed and compared with others.
    Notes: Hg[Mo6Cli8]Cla6 kristallisiert kubisch mit a = 12,706 Å in der Raumgruppe Pn3-T2h; (Z = 4). Die Struktur konnte aus den photometrierten Pulverintensitäten von 100 Reflexen durch die Verwendung reduzierter Parameter mit befriedigender Genauigkeit gelöst werden (R = 0,06). Die polynuclearen Anionen {[Mo6Cli8]Cla6}2- sind innerhalb der Fehlergrenzen regulär mit Mo-Mo = 2,62 Å, Mo-Cli = 2,48 Å und Mo-Cla = 2,50 Å. Ihre Schwerpunkte bilden mit den Hg-Atomen eine Anordnung vom NaCl-Typ (Hg-Cla = 2,56 Å). Einzelheiten zur Struktur und Vergleiche mit anderen Anordnungen werden diskutiert.
    Additional Material: 2 Ill.
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  • 8
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The crystal structures of the compounds (I) and (II) (see Inhaltsübersicht) and of the compound (III), formed by ligand exchange from (II), are determined. The complex anions ([Nb6X12]Y6)2- occupy the corners of a nearly regular cubus which contains, in its centre, two PyH+ cations with mutual parallel orientation. The bond lengths Nb-Nb are 3,032-3,072 Å (corresponding to 14 e/Nb6). In the course of the thermal transformation (II) (III) six Cla-atoms are exchanged by six Bri-atoms in two trigonal planes of the single clusters. Details of structure and ligand exchange are elucidated.
    Notes: Die Strukturen der Verbindungen (PyH)2[Nb6Cl12i]Cl6a (I) und (PyH)2[Nb6Br12i]Cl6a (II) und der durch Ligandenaustausch aus (II) entstandenen Verbindung (PyH)2[Nb6Br12iCl12i]Br6a(III) wurden bestimmt [Py = C5H5N]. Komplexe Anionen ([Nb6X12]Y6)2- besetzen die Eckpunkte eines nahezu regulären Würfels, in dessen Mitte zwei (PyH)+-Kationen planparallel übereinander liegen. Die Nb-Nb-Abstände betragen 3,032-3,072 Å (entsprechend 14 e/Nb6). Bei der thermischen Umlagerung (II) (III) werden sechs Cla-Atome gegen sechs Bri-Atome innerhalb von zwei trigonalen Ebenen der einzelnen Cluster ausgetauscht. Einzelheiten der Strukturen und des Ligandenaustauschs werden diskutiert.
    Additional Material: 3 Tab.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 395 (1973), S. 223-238 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Clathrates Ge38A8X8 with A = P, As, Sb and X = Cl, Br, JThe compounds Ge38A8X8 were synthesized in crystalline form either from the elements or from germanium and suitable halides (sealed quartz tube; temperature drop). The substances obtained are silvern shining, brittle and chemically very resistant. At temperatures between 600 and 700 °C they decompose to yield the elements, halides and other yet unidentified products. X-ray diffraction data show, that the compounds crystallize in the cubic space group P43n having a structure analogous to that of the gas hydrates. In this structure the 38 Ge and 8 A atoms build up a three dimensional E46 frame work of tetrahedrally bounded atoms; the 8Xatoms are situated inside the big cages of this frame. The constitutional formula Ge38A8+X8- justifies this picture. The lattice parameters and the interatomic distances show a systematic dependence upon the elements used.Measurements of the specific electrical conductivities prove semi conduction.Mixed crystals were prepared by exchange of halogen or by substitution 1 interchange of Ge by (III, V) phases.
    Notes: Die Verbindungen Ge38A8X8warden in kristalliner Form aus den Elementen bzw. geeigneten Halogeniden synthetisiert (Quarzampullen; Temperaturgefälle). Es handelt sich um silberglänzende, spröde Stoffe, die chemisch sehr wiederstandsfähig sind. Sie zerfallen bei Temperaturen von 600-700°C in die Elemente, Halogenide und weitere. bisher unbekannte Stoffe. Nach Röntgenstrukturanalysen Kristallisieren die Verbindungen kubisch in P43n mit einer den Gashydraten analogen Struktur, in dieser bilden die 38 Ge- und 8 A-Atome ein 3-dimensionales E46-Gerüst tetraedrisch gebundener Atome in dessen großen Käfigen die 8 X-Atome liegen. Die Formulierung Ge38A8+X8- wird diesem Aufbau gerecht. Die Gitterparameter und Atomabstände zeigen systematische Abhängigkeiten von den aufbauenden Elementen. Messungen der spezifischen Leitfähigkeiten beweisen die Halbleitereigenschaften.Mischkristalle durch Halogenaustausch bzw. durch Ersatz von Ge durch (III, V)- Phasen wurden dargestellt.
    Additional Material: 6 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 399 (1973), S. 257-262 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation of Organosilicon Compounds. XXXXIX. Crystal and Molecular Structure of Octachlorohexasila-asteran Si6C6H8Cl8Octachlorohexasila-asteran Si6C6H8Cl8 crystallizes in the triclinic space group P1 with a = 8.588 Å, b = 8.612 Å, c = 8.053 Å, α = 67.8°, β = 66.7°, γ = 66.3° and 1 molecule in the unit cell. In this hexacyclic molecule the Si-atoms has significantly different mean bond length, i. e. Si—C = 1.815 ± 0.015 Å and Si—Cl = 2.056 ± 0.016 Å at the 〉 SiCl2 groups but Si—C = 1.890 ± 0.022 Å and Si—Cl = 2.025 ± 0.003 Å at the SiCl groups. Remarkable are the bond angles in the four membered rings because those at the Si-atoms (93°) are larger than those at the C-atoms (87°).
    Notes: Octachlorohexasila-asteran Si6C6H8Cl8 kristallisiert triklin in der Raumgruppe P1 mit a = 8,588 Å, b = 8,612 Å, α = 67,8°, β = 66,7° und γ = 66,3° (Z = 1). In dieser hexacyclischen Molekel treten signifikant verschiedene mittlere Bindungslängen an den Si-Atomen auf, nämlich Si—C = 1,815 ° 0,015 Å und Si—Cl = 2,056 ± 0,016 Å bei den 〉SiCl2-Gruppen bzw. Si—C = 1,890 ± 0,022 Å und Si—Cl = 2,025 ± 0,003 Å bei den SiCl-Gruppen. Beachtenswert sind die Bindungs-winkel in den 4-Ringen, die an den Si-Atomen (93°) größer sind als an den C-Atomen (87°).
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