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  • 1
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Inorganic chemistry 26 (1987), S. 217-218 
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
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  • 4
  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 528 (1985), S. 55-60 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Divalent Neodymium: NdCl2 and KNd2Cl5Single crystals of NdCl2 have been obtained via metallothermic reduction of NdCl3 with lithium: a = 908.49(5), b = 761.47(5), c = 455.62(2) pm, Pbnm, Z = 4, PbCl2 type, refined to R = 0.047. Reduction of NdCl3 with potassium yields KNd2Cl5: a = 894.51(9), b = 785.16(7), c = 1 265.28(13) pm, β = 90.000(8)°, P21/c, Z = 4, isotypic with TlPb2Cl5. There is a close structural relationship of KNd2Cl5 with K2NdCl5.
    Notes: Bei der „metallothermischen Reduktion“ von NdCl3 mit Lithium werden Einkristalle von NdCl2 erhalten: a = 908,49(5); b = 761,47(5); c = 455,62(2) pm; Pbnm, Z = 4, PbCl2-Typ, Verfeinerung bis R = 0,047. Kalium reduziert NdCl3 unter Bildung von KNd2Cl5: a = 894,51(9); b = 785,16(7); c = 1265,28(13) pm; β = 90,000(8)°, P21/c, Z = 4, isotyp mit TlPb2Cl5. Es besteht eine enge strukturelle Verwandtschaft mit K2NdCl5.
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  • 6
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese und Kristallstrukturen des durch Wasserstoff oder Kohlenstoff stabilisierten Lutetiummonochlorids, LuClHx und Lu2Cl2CEinkristalle des durch interstitiellen Wasserstoff oder Kohlenstoff stabilisierten, als solches aber offenbar nicht existierenden Lutetiummonochlorids, LuCl, dem eine Schichtstruktur aus Viererpaketen „ClLuLuCl“ zukäme, wurden durch Umsetzung von LuCl3 mit metallischem Caesium (LuClHx) bzw. mit Lutetium und Kohlenstoff in Anwesenheit von CsCl (Lu2Cl2C) bei höheren Temperaturen (oberhalb 700°C) in Tantalampullen erhalten. Beide kristallisieren in sog. 3R-Strukturen (Raumpruppe R3m), LuClHx mit a = 363.83(3); c = 2710,2(3) pm; Z = 6 im ZrCl-Typ mit Wasserstoff in Tetraederlücken und Lu2Cl2C mit a = 360,17(3); c = 2716,0(3) pm; Z = 3 im Tetradymit-Typ (Bi2Te2S) mit Kohlenstoff in Oktaederlücken zwischen den Metall-Doppel-schichten. Nach Pulveraufnahmen liegt auch 1T-Lu2Cl2C vor: a = 359,72(3); c = 909.25(9) pm; P3ml; Z = 1.
    Notes: Single crystals of the, basically, four-layer slab structure …ClLuLuCl… of the apparently as such nonexisting lutetium monochloride, LuCl, stabilized by interstitial hydrogen or carbon have been obtained from reactions of LuCl3 and cesium (LuClHx, due to ubiquitous hydrogen) and CsCl, lutetium and carbon (Lu2Cl2C), respectively, in sealed tantalum containers at elevated temperatures (above 700°C). Both exhibit so-called 3R structures (space group R3m): LuClHx (a = 363.83(3), c = 2710.2(3) pm, Z = 6) crystalizes with the ZrCl type structure with hydrogen in tetrahedral interstices and Lu2Cl2C (a = 360.17(3), c = 2716.0(3) pm, Z = 3) with the tetradymite type (Bi2Te2S) with carbon in octahedral interstices between the double metal layers. Power X-ray diffraction shows that for Lu2Cl2C a 1T structure is also adopted (a = 359.72(3), c = 909.25(9) pm, p3m1, Z = 1).
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 552 (1987), S. 97-102 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pr2Br5: Kein gemischtvalentes PraseodymbromidBei der metallothermischen Reduktion von PrBr3 mit met. Lithium im molaren Verhältnis 1:1 in verschweißten Tantalampullen bei 850°C erhält man bronzefarbene, metallisch glänzende Stäbchen von Pr2Br5. Die Kristallstruktur (monoklin, P21/m, Z = 2, a = 774,38(4); b = 415,33(3), c = 1327,06(9) pm; β = 90,816(6)°; Vm = 128.52(2) cm3 mol-1) enthält sieben- und achtfach koordiniertes, dreiwertiges Praseodym in einfach bzw. doppelt bekappten trigonalen Prismen. Pr2Br5 sollte deshalb gemäß (Pr3+)2(Br-)5(e-) formuliert werden. Das Bromid ist isostrukturell mit Pr2I5 und offenbar identisch mit dem im System Pr/PrBr3 beschriebenen PrBr2·38.
    Notes: The metallothermic reduction of praseodymium tribromide, PrBr3, with lithium metal (molar ratio 1:1) in sealed tantalum containers at 850°C yields bronze lustrous rods of Pr2Br5. The crystal structure (monoclinic, P21/m, Z = 2, a = 774.38(4), b = 415.33(3), c = 1327.06(9) pm, β = 90.816(6)°, Vm = 128.52(2) cm3 mol-1) contains seven- and eight-coordinate trivalent praseodymium in mono- and bicapped trigonal prisms. Pr2Br5 should therefore be formulated as (Pr3+)2(Br-)5(e-). It is isostructural with Pr2I5 and is believed to be identical with PrBr2,38 reported for the Pr/PrBr3 system.
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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: Zweiwertiges Samarium: Synthese und Kristallstrukturen von Sm4OCl6 und KSm2Cl5Einkritalle von Sm4OCl6 und KSm2Cl5 erhält man bei der metallothermischen Reduktion von SmCl3 mit Lithium (in Gegenwart von Sm2O3 oder SmOCl) bzw. Kalium bei höheren Temperaturen in verschweißten Tantalbehältern. Sm4OCl6 (hexagonal, P63mc, Z = 2, a = 946,59(4); c = 717,88(4) pm) und KSm2Cl5 (monoklin, P21/c, Z = 4, a = 888,06(6); b = 784,81(5); c = 1262,77(8) pm; ß = 90,085(6)°) enthalten beide zweiwertiges Samarium. In Sm4OCl6 treten mit 236,0 und 237,6 (3x) pm bemerkenswert kurze Abstände Sm2+—O2- innerhalb des Tetraeders [Sm4O] auf.
    Notes: Single crystals of Sm4OCl6 and KSm2Cl5 have been obtained by metallothermic reductions of SmCl3 with lithium (in the presence of Sm2O3 or SmOCl) and potassium, respectively, at elevated temperatures in sealed tantalum containers. Sm4OCl6 (hexagonal, P63mc, Z = 2, a = 946.59(4), c = 717.88(4) pm) and KSm2Cl5 (monoclinic, P21/c, Z = 4, a = 888.06(6), b = 784.81(5), c = 1262.77(8) pm, ß = 90.085(6)°) are true divalent samarium compounds, Sm4OCl6 with remarkably short Sm2+-O2- distances (236.0, 237.6 (3x) pm) within the [Sm4O] tetrahedron.
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  • 9
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Drei Bromide des Lanthans: LaBr2, La2Br5 und LaBr3Farbloses LaBr3 wurde durch Umsetzung von La2O3 mit NH4Br bzw. in einkristalliner Form durch chemischen Transport mit AlBr3 erhalten. Schwarze Einkristalle von LaBr2 und La2Br5 wachsen aus der Schmelze, die man bei der metallothermischen Reduktion von LaBr3 mit Lithium erhält (verschweißte Tantalampulle, 850°C). Die Kristallstrukturen der drei Lanthanbromide wurden verfeinert: LaBr2. 2H2-Typ, hexagonal (P63/mmc); a = 409,88(4) pm; c = 1 390,0(1) pm; R = Rw = 0,092; La2Br5. Pr2I5-Typ, monoklin (P21/m); a = 789,09(6) pm; b = 424,89(4) pm; c = 1342,3(1) pm β = 91,60(1)º; R = 0,067; Rw = 0,055; LaBr3. UCl3-Typ, hexagonal (P63/m) a = 797,13(4) pm; c = 452,16(4) pm; R = 0,036; Rw = 0,032.
    Notes: Colourless LaBr3 was obtained via the ammonium-bromide route and in singlecrystalline form by chemical vapour-phase transport with aluminium tribromide. Black single crystals of LaBr2 and La2Br5 have been grown from the melts that are obtained by lithium reduction of lanthanum tribromide in sealed tantalum ampoules at 850°C. The crystal structures of the three bromides of lanthanum were refined: LaBr2. 2H2-MoS2 type, hexagonal (P63/mmc), a = 409.88(4) pm, c = 1390.0(1) pm, R = Rw = 0.092; La2Br5. Pr2I5 type, monoclinic (P21/m), a = 789.09(6) pm, b = 424.89(4) pm, c = 1342.3(1) pm, β = 91.60(1)º, R = 0.067, Rw = 0.055; LaBr3. UCl3 type, hexagonal (P63/m), a = 797.13(4) pm, c = 452.16(4) pm, R = 0.036, Rw = 0.032.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 590 (1990), S. 103-110 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The System NazGdClHx/S. I. Crystal Structure of NaGdCl4NaGdCl4 is obtained together with Gd2S3 through oxidation of Na0.25GdClH0.75 with sulfur (sealed tantalum container, 850°C, 7 d) as colourless single crystals or as a white powder by thermal decomposition of (NH4)2NaGdCl6 (320°C). The crystal structure (triclinic, P1, a = 702.81(6), b = 676.25(5), c = 666.72(5) pm, α = 100.852(7), β = 91.702(7), γ = 89.760(7)°, R = 0.040, Rw = 0.032) may be derived from the fluorite type although both Na+ and Gd3+ have coordination numbers (C.N.) of seven (monocapped trigonal prism). The structure may also be described as a layer structure where puckered layers are stacked along [100] in the sequence Cl2GdCl2NaCl2GdCl2 with Cl3 and Cl4 in four-fold cationic coordination and Cl1 and Cl2 with C.N. 3.
    Notes: NaGdCl4 entsteht neben Gd2S3 bei der Oxydation von Na0,25GdClH0,75 mit Schwefel (Tantal-Ampulle, 850°C, 7 d) in Form von farblosen, derben Einkristallen oder durch thermischen Abbau von (NH4)2NaGdCl6 (320°C) als weißes Pulver. Die Kristallstruktur (triklin, P1; a = 702,81(6); b = 676,25(5); c = 666,72(5) pm; α = 100,852(7); β = 91,702(7); γ = 89,760(7)°; R = 0,040; Rw = 0,032) leitet sich vom Fluorit-Typ ab, jedoch weisen Na+ und Gd3+ jeweils die Koordinationszahl 7 (bekapptes trigonales Prisma) auf. Sie kann auch als Schichtstruktur beschrieben werden: Gewellte Schichten werden gemäß Cl2GdCl2NaCl2GdCl2 längs [100] gestapelt, wobei Cl1 und Cl2 C.N. 3, Cl3 und Cl4 aber C.N. 4 aufweisen.
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