ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The compounds Rb2Mn3S4, Cs2Mn3S4, Rb2Co3S4 and Cs2Co3S4 were prepared by melting reactions in a nitrogen atmosphere. X-ray investigations of Cs2Mn3S4 single crystals lead to the space group Ibam-D2h26 Z = 4. The manganese- as well as the alkalimetal-atoms are arranged in layers which are separated by sulphur layers. The other compounds have an analogous structure. This could be shown by powder diffraction investigations.
    Notes: Über Schmelzreaktionen in einer Stickstoffatmosphäre wurden folgende Sulfide dargestellt: Rb2Mn3S4, Cs2Mn3S4, Rb2Co3S4 und Cs2Co3S4. Strukturuntersuchungen an Einkristallen von Cs2Mn3S4 führten zu der Raumgruppe Ibam-D2h26 mit Z = 4. Die Anordnung der Atome ergibt eine Schichtenstruktur, in der alternierende Mangan- und Alkalimetallschichten jeweils durch Schwefellagen getrennt sind. Untersuchungen an pulverförmigen Präparaten ergaben für die übrigen Sulfide einen isotypen Aufbau.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 167-172 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structure of K2S3 and K2Se3Well formed crystals of K2S3 and K2Se3 were obtained by reaction of the elements in liquid ammonia at 500 bar and 150°C. The substances are both orthorhombic, space group Cmc21. Cell constants are: The structure contains S32-(Se32-) polyanions, with S—S—S(Se—Se—Se) angles of 105.4(102.5)°. The S—S(Se—Se) distance is 2.083(2.383) Å.
    Notes: Gut ausgebildete Kristalle von K2S3 und K2Se3 erhält man aus den Elementen bei 500 bar und 150°C in Ammoniak. Beide Substanzen sind isotyp und kristallisieren rhombisch in der Raumgruppe Cmc21. Die Gitterkonstanten lauten: Die Struktur enthält gewinkelte S32-(Se32-)-Polyanionen mit einem S—S(Se—Se)-Abstand von 2,083(2,383) Å und einem S—S—S(Se—Se—Se)-Winkel von 105,4(102,5)°.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 523 (1985), S. 145-152 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of CsTe4CsTe4 results from a melting reaction at 570°C in sealed quartztubes. The starting materials Cs and Te in the molar ratio 1:4 are produced in a first step by controlled decomposition of the CsN3 from mixtures of CsN3 and Te (1:4) at 350°C.CsTe4 is monoclinic, space group P21/c, with a = 7.857(1) Å, b = 7.286(1) Å, c = 14.155(2) Å, β = 93.83(1)°, and Z = 4. The tellurium atoms form a two-dimensional puckered layer built of from pseudo-trigonal-bipyramidal, T-shaped units Te4-. The central tellurium atom of this unit may be considered as a pseudo iodine. The compound is compared with other tellurides MTen having some like that unexpected principles of connection.
    Notes: CsTe4 entsteht aus Gemengen von Caesium und Tellur im Molverhältnis 1:4, wenn man diese in abgeschlossenen Ampullen einer Schmelzreaktion bei 570°C unterwirft. Die Elementgemenge stellt man der, indem man CsN3 und Te (1:4) zusammengibt und anschließend durch kontrollierte Zersetzung des Azids den Stickstoff vertreibt.CsTe4 kristallisiert monoklin in der Raumgruppe P21/c (Z = 4) mit den Gitterkonstanten a = 7,857(1) Å, b = 7,286(1) Å, c = 14,155(2) Å, β = 93,83(1)°. In der Strukture liegt ein zweidimensional-unendliches Polyanion ∞2[Te4-] vor. Die Verwandtschaft mit anderen tellurriechen Telluriden MTen wird diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 542 (1986), S. 144-152 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NaTe3 - a Compound with Cuban-like Clusters Te126-NaTe3 results as a greyish microcrystalline powder if stoichiometric amounts of the pure elements sodium and tellurium (molar ratio 1:3) are allowed to react in liquid ammonia at about -50°C. After melting the crude product (500°C, 1 h, corundum crucible in sealed glass ampoule), followed by an annealing period (380°C, 5 days) NaTe3 yields as a silvery compound with metallic lustre.NaTe3 is trigonal, space group P3c1, Z = 12, with a = 9.033(2) Å and c = 21.930(4) Å. It contains Te62--chains, linked together via their terminal atoms producing infinite strings. These strings may be thought to be built up of cuban-like clusters Te126-.
    Notes: NaTe3 entsteht beim Umsatz elementaren Natriums und Tellurs im Molverhältnis 1:3 in flüssigem Ammoniak bei etwa -50°C. Es fällt nach Entfernen des Lösungsmittels als homogenes, matt dunkelgrau aussehendes, mikrokristallines Pulver an.NaTe3 kristallisiert trigonal in der Raumgruppe P3c1 mit Z = 12. Gitterkonstanten: a = 9,033(2) Å, c = 21,930(4) Å.Das Anionenteilgitter enthält verknüpfte Te62--Ketten, wodurch eindimensional-unendliche Stränge entstehen, deren bestimmendes Bauelement ein kuban-artiger Cluster Te126- ist.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 0044-2313
    Keywords: Lithium [tris(trimethylsilyl)silyl]tellanide · DME ; covalent radius of DME complexed Li ; [tris(trimethylsilyl)silyl]tellane ; methyl-[tris(trimethylsilyl)silyl]tellane ; bis[tris(trimethylsilyl)silyl]ditellane ; Te—H bond ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal Derivatives of Molecular Compounds. IV Synthesis, Structure, and Reactivity of Lithium [Tris(trimethylsilyl)silyl]tellanide · DMELithium tris(trimethylsilyl)silanide · 1,5 DME [3] and tellurium react in 1,2-dimethoxyethane to give colourless lithium [tris(trimethylsilyl)silyl]tellanide · DME (1). An X-ray structure determination {-150 · 3·C; P21/c; a = 1346.6(4); b = 1497.0(4); c = 1274.5(3) pm; β = 99.22(2)·; Z = 2 dimers; R = 0.030} shows the compound to be dimeric forming a planar Li—Te—Li—Te ring with two tris(trimethylsilyl)silyl substituents in a trans position. Three-coordinate tellurium is bound to the central silicon of the tris(trimethylsilyl)silyl group and to two lithium atoms; the two remaining sites of each four-coordinate lithium are occupied by the chelate ligand DME {Li—Te 278 and 284; Si—Te 250; Li—O 200 pm (2X); Te—Li—Te 105°; Li—Te—Li 75°; O—Li—O 84°}. The covalent radius of 154 pm as determined for the DME-complexed lithium in tellanide 1 is within the range of 155 ± 3 pm, also characteristic for similar compounds. In typical reactions of the tellanide 1 [tris(trimethylsilyl)silyl]tellane (2), methyl-[tris(trimethylsilyl)silyl]tellane (4) and bis[tris(trimethylsilyl)silyl]ditellane (5) are formed.
    Notes: Lithium-tris(trimethylsilyl)silanid · 1,5 DME [3] reagiert mit Tellur in 1,2-Dimethoxyethan zu farblosem Lithium-[tris(trimethylsilyl)silyi]tellanid · DME (1). Nach der Röntgenstrukturanalyse {-150 ± 3°C; P21/c; a = 1346,6(4); b = 1497,0(4); c = 1274,5(3) pm; β = 99,22(2)°; Z = 2 Dimere; R = 0,030} ist Verbindung 1 im Festkörper dimer; die beiden Tris(trimethylsilyl)silyl-Gruppen sind am planaren Li—Te—Li—Te-Ring trans-ständig zueinander angeordnet. Tellur erreicht durch Bindung an zwei Lithium und ein Silicium die Koordinationszahl 3, Lithium durch Bindung an zwei Tellur und den Chelatliganden DME die Koordinationszahl 4 {Li—Te 278 und 284; Si—Te 250; Li—O 200 pm (2X); Te—Li—Te 105°, Li—Te—Li 75°; O—Li—O 84°}. Der hier zu 154 pm ermittelte kovalente Radius des DME-komplexierten Lithiumatoms fällt in den auch für andere Verbindungen typischen Bereich von 155 ± 3 pm. Charakteristische Umsetzungen des Tellanids 1 führen zu [Tris(trimethylsilyl)silyl]tellan (2), Methyl-[tris(trimethylsilyl)silyl]tellan (4) und Bis[tris(trimethylsilyl)silyl]ditellan (5).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 0044-2313
    Keywords: Selenides ; Cr5B3 type, In5Bi3 type, TlSe type ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of SnTl4Se3 with a Note on TlSeWe describe the preparation and crystal structure of SnTl4Se3. It crystallizes as a low symmetric distorted derivative with the In5Bi3 type of structure, which itself should be considered as a subfamily of the Cr5B3 type of structure: a = 852.2(2) pm, c = 1 272.2(6) pm, c/a = 1.49, Z = 4. Short Sn—Se distances of 311 pm, and 326 pm, respectively, are obtained in ∞1[SnSe2/2] chains running along [001]. Furthermore, short Tl—Se distances are found in quasimolecular bent moieties Tl2Se: 300 pm, 313 pm, and 347 pm, respectively. SnTl4Se3 is a semiconductor. The conductivity of some closely related phases are also reported.Finally, the structure of the well known compound TlSe has been refined for the first time, in order to get some more information about Tl1+—Se distances for square-antiprismatic coordinated Tl1+ ions.
    Notes: Darstellung und Kristallstruktur von SnTl4Se3 werden beschrieben. Die Verbindung kristallisiert in der Raumgruppe P4/ncc als niedersymmetrische Verzerrungsvariante des In5Bi3-Typs, der selbst eine isopuntale Unterfamilie des Cr5B3-Typs ist: a = 852,2(2) pm, c = 1 272,2(6) pm, c/a = 1,49, Z = 4. Es treten kurze Sn—Se-Abstände in längs [001] verlaufenden ∞1[SnSe2/2]-Ketten (311 pm, 326 pm) und kurze Tl—Se-Abstände in quasimolekularen, gewinkelten Baugruppen Tl2Se auf (300 pm, 313 pm, 347 pm). Die Verbindung ist halbleitend; die Leitfähigkeiten einiger verwandter Verbindungen werden ebenfalls vorgestellt.Um Vergleichswerte für Tl1+-Ionen mit quadratisch-antiprismatischer Se-Koordination zu erhalten, ist die Struktur der bekannten Verbindung TlSe erstmals mittels Einkristallen verfeinert worden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 0044-2313
    Keywords: Cr5B3 Type ; Ca5Hg3 ; Sr5Cd3 ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Ca5Hg3 and Sr5Cd3Both the incongruently melting compounds, Ca5Hg3 and Sr5Cd3, have been synthesized from stoichiometric amounts of the pure elements. They crystallize with the Cr5B3 type of structure: space group I4/mcm, Z = 4; Ca5Hg3 (Sr5Cd3): a = 818.9(1) (871.7(1)) pm, c = 1 470.1(3) (1 660.1(3)) pm, c/a = 1.80 (1.90), R = 2.33% (2.97%). The most remarkable fragments are dumbbells X2, which have interatomic distances only slightly longer than the sum of Pauling's covalent radii: Hg—Hg (Cd—Cd) = 306 (298) pm. The structure can be constructed by rhombic dodecahedra as the only constituent moieties. These rhombic dodecahedra are built up by eight Ca (Sr) atoms and six Hg (Cd) atoms and are furthermore centered by an additional Ca (Sr) atom. Along [001] the rhombic dodecahedra share common vertices, but along [110] they are interconnected via common triangular faces. This kind of face sharing is responsible for the short distances obtained between the polyhedra, which leads to the occurrence of the dumbbells mentioned above.
    Notes: Die inkongruent schmelzenden Verbindungen Ca5Hg3 und Sr5Cd3 werden aus stöchiometrischen Mengen der reinen Elemente hergestellt. Beide Verbindungen kristallisieren im Cr5B3-Typ: Raumgruppe I4/mcm, Z = 4; Ca5Hg3 (Sr5Cd3): a = 818,9(1) (871,7(1)) pm, c = 1 470,1(3) (1 660,1(3)) pm, c/a = 1,80 (1,90), R = 2,33% (2,97%). Das bemerkenswerteste Strukturmerkmal sind diatomare Hanteln der Minderheitskomponente mit Abständen Hg—Hg (Cd—Cd) von 306 (298) pm. Als strukturaufbauendes Polyeder kann man ein längs [001] gestrecktes Rhombendodekaeder aus acht Ca-(Sr-) und sechs Hg-(Cd-) Atomen wählen, das von einem zusätzlichen Ca- (Sr-) Atom zentriert wird. Die Rhombendodekaeder sind entlang [110] über einige ihrer Rhomben flächenverknüpft, wodurch sich zwei Rhombendodekaeder so nahe kommen, daß die erwähnten Hanteln ausgebildet werden können.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 0044-2313
    Keywords: Strontium amalgam, Sr3Hg2 ; crystal structure ; U3Si2 type ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Verfeinerung der Kristallstruktur des Sr3Hg2Aus Mischungen von Strontium und Quecksilber im Molverhältnis 7:3 kann man durch Tempern bei 520°C (20 Tage) phasenreine Proben von Sr3Hg2 erhalten, aus denen Einkristalle ausgelesen werden können. Sr3Hg2 kristallisiert im U3Si2-Typ (Raumgruppe P4/mbm) mit a = 8,883(2) Å und c = 4,553(1) Å. Alle Hg-Atome sind in Hanteln eingebunden (dHg—Hg = 3,41 Å).
    Notes: Mixtures of strontium and mercury in molar ratios of 7:3 have been annealed for 20 days at 520°C. From the pure product Sr3Hg2 single crystals have been obtained. Sr3Hg2 crystallizes in the U3Si2 type of structure (space group P4/mbm); the cell constants are a = 8.883 (2) Å and c = 4.553(1) Å. All of the Hg atoms are involved in Hg2 dumbbells with Hg—Hg distances of 3.41 Å.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 0044-2313
    Keywords: [Dibenzo-18crown6] · CH3CN · CH3CSOH ; [Dicyclohexyl-18-crown6] · (CH3CSOH)2 ; [Cs(benzo-15crown5)2] CH3CSS ; [Cs(dibenzo-18crown6)]2S5(DMF)2 ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of the Adducts [DB-18C6] · CH3CN · CH3CSOH and [DC-18C6](CH3CSOH)2 as well as of the Salt-like Compounds [Cs(B-15C5)2]CH3CSS and [Cs(DB-18C6)]2S5(DMF)21)The reaction products of crown ethers, cesium, and sulfur in aprotic solvents like acetonitrile and dimethylformamide strongly depend on the reaction conditions. Using CH3CN as a solvent, sometimes neutral host-guest adducts crystallize only, e.g., [dibenzo-18C6] · CH3CN · CH3CSOH (monoclinic, S. G. P21/c, Z = 4, a = 9.73(1) Å, b = 22.03(1) Å, c = 11.86(1) Å, β = 91.8(1)°) or [dicyclohexyl-18C6](CH3CSOH)2 (monoclinic, S. G. P21/n, Z = 2, a = 7.75(1) Å, b = 10.32(1) Å, c = 17.73(1) Å, β = 95.7(1)°). The monothioacetic acid, CH3CSOH, must be regarded as the first product of the hydrolysis of CH3CN. Furthermore, another product of this kind of hydrolysis, CH3CSSH, is obtained too. Therefore, we also obtain the salt-like compound [Cs(benzo-15C5)2]CH3CSS (monoclinic, S. G. C2/c, Z = 4, a = 16.05(1) Å, b = 16.73(1) Å, c = 13.11(1) Å, β = 106.3(1)°). If the solvent DMF is used, the pentasulfide [Cs(dibenzo-18C6)]2S5(DMF)2 crystallizes (monoclinic, S. G. P21/n, Z = 4, a = 14.79(1) Å, b = 14.24(1) Å, c = 25.74(1) Å, β = 92.7(1°. The S52- anions show the cis-conformation.
    Notes: Setzt man Kronenether mit Cs2CO3 im Molverhältnis 2:1 mit Schwefel und H2S in Dimethylformamid oder Acetonitril als Lösungsmitteln um, erhält man je nach Reaktionsführung und Lösungsmittel unterschiedliche Produkte. Mit Dibenzo-18-Krone-6 in CH3CN kristallisiert das neutrale 1:2-Addukt [Dibenzo-18C6] · CH3CSOH · CH3CN (monoklin, Raumgruppe P21/c, Z = 4; a = 9,73(1) Å; b = 22,03(1) Å; c = 11,86(1) Å; β = 91,8(1)°). Mit Dicyclohexyl-18-Krone-6 in CH3CN erhalten wir unter ähnlichen Bedingungen das neutrale 1:2-Addukt [Dicyclohexyl-18C6](CH3CSOH)2 (monoklin, Raumgruppe P21/n; Z = 2; a = 7,75(1) Å; b = 10,32(1) Å; c = 17,73(1) Å; β = 95,7(1)°). Mit Benzo-15-Krone-5 in CH3CN erhalten wir unter wiederum nicht wesentlich unterschiedlichen Bedingungen das Dithioacetat [Cs(Benzo-15C5)2]CH3CSS, das ein komplexes Kronenether-Kation aufweist (monoklin, Raumgruppe C2/c; Z = 4; a = 16,05(1) Å; b = 16,73(1) Å; c = 13,11(1) Å; β = 106,3(1)°). Wird Dibenzo-18-Krone-6 in DMF umgesetzt, kristallisiert das Pentasulfid [Cs(Dibenzo-18C6)]2S5(DMF)2 (monoklin, Raumgruppe P21/n; Z = 4; a = 14,79(1) Å; b = 14,24(1) Å; c = 25,74(1) Å; β = 92,7(1)°). Die Pentasulfid-Anionen sind cis-konformiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 0044-2313
    Keywords: Dialkali metal dichalcogenides ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Dialkali Metal Dichalcogenides β-Na2S2, K2S2, α-Rb2S2, β-Rb2S2, K2Se2, Rb2Se2, α-K2Te2, β-K2Te2 and Rb2Te2The first presentation of pure samples of α- and β-Rb2S2, α- and β-K2Te2, and Rb2Te2 is described. Using single crystals of K2S2 and K2Se2, received by ammonothermal synthesis, the structure of the Na2O2 type and by using single crystals of β-Na2S2 and β-K2Te2 the Li2O2 type structure will be refined. By combined investigations with temperature-dependent Guinier-, neutron diffraction-, thermal analysis, and Raman-spectroscopy the nature of the monotropic phase transition from the Na2O2 type to the Li2O2 type will be explained by means of the examples α-/β-Na2S2 and α-/β-K2Te2. A further case of dimorphic condition as well as the monotropic phase transition of α- and β-Rb2S2 is presented. The existing areas of the structure fields of the dialkali metal dichalcogenides are limited by the model of the polar covalence.
    Notes: Die erstmalige Darstellung phasenreiner Proben von α- und β-Rb2S2, von α- und β-K2Te2 und von Rb2Te2 wird beschrieben. Mit Hilfe von ammonothermal synthetisierten Einkristallen des K2S2 und des K2Se2 wird die Struktur des Na2O2-Typs, mit Einkristallen des β-Na2S2 und des β-K2Te2 die des Li2O2-Typs verfeinert. Durch kombinierte temperaturabhängige Guinier-, Neutronenbeugungs-, thermoanalytische und Raman-spektroskopische Untersuchungen wird die Natur des monotropen Phasenübergangs vom Na2O2-Typ zum Li2O2-Typ an Hand der Beispiele α-/β-Na2S2 und α-/β-K2Te2 aufgeklärt. Ein weiterer Fall von Dimorphie, der ebenfalls monotrope Übergang von α-Rb2S2(Rb2O2-Typ) zu β-Rb2S2(Na2O2-Typ), wird vorgestellt. Die Existenzgebiete der Strukturfelder bei den Dialkalimentalldichalkogeniden werden mittels des Modells der polaren Kovalenz gegeneinander abgegrenzt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...