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: Complex copper(II) fluorides ; ternary system BaF2—CuF2—ScF3 ; phase diagram ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Komplexe Kupfer(II)-fluoride. XV. Das ternäre System BaF2—CuF2—ScF3Das fest-flüssig Phasendiagramm des binären Systems BaF2—ScF3 wird mittels DTA- und röntgenographischer Daten bestimmt. Das System enthält drei Fluoride: Ba3Sc2F12, Ba5Sc3F19 und eine kubische Hochtemperaturphase Ba1-xScxF2+x (x = 0,17), deren Struktur sich von BaF2 ableitet. Eine feste Lösung zwischen BaF2 und ScF3 wird bei hoher Temperatur nachgewiesen. Das ternäre System BaF2—CuF2—ScF3 wird röntgenographisch untersucht und ein isothermaler Schnitt bei 670°C wiedergegeben. Es zeigt sich die Existenz von vier Phasen: Ein komplexes quaternäres Fluorid Ba10Cu12ScF47, zwei polytype Phasen, deren Strukturen sich von BaCuF4 ableiten und eine tetragonale feste Lösung Ba5Sc3-xCuxF19-x mit 0 ≤ x ≤ 1.
    Notes: The liquid-solid phase diagram of the binary system BaF2—ScF3 is established by D.T.A. and radiocrystallography. Three fluorides are disclosed: Ba3Sc2F12, Ba5Sc3F19 and a cubic high temperature phase Ba1-xScxF2+x (x = 0.17), the structure of which derives from that of BaF2. A solid solution between BaF2 and ScF3 is also evidenced at high temperature. The ternary system BaF2—CuF2—ScF3 is investigated by radiocrystallography and an isothermal section at 670°C is given. It shows the existence of four phases: a complex quaternary fluoride Ba10Cu12ScF47, two “polytypic” phases the structure of which derives from that of BaCuF4 and a tetragonal solid solution Ba5Sc3-xCuxF19-x with 0 ≤ x ≤ 1.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 833-838 
    ISSN: 0044-2313
    Keywords: Fluoromanganate(III) hydrates, Mn3F8 · 12H2O, AgMnF4 · 4 H2O ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Neue Fluoromanganat(III)-Hydrate: Mn3F8 · 12H2O and AgMnF4 · 4H2ODie Fluoridhydrate Mn3F8 · 12H2O und AgMnF4 · 4 H2O wurden in Form von Einkristallen hergestellt und durch Röntgenbeugungsmethoden charakterisiert. Mn3F8 · 12H2O kristallisiert in Raumgruppe P1 (a = 623.0(3), b = 896.7(4), c = 931.8(4) pm, α = 110.07(2)°, β = 103.18(2)°, γ = 107.54(2)°, Z = 1); AgMnF4 · 4 H2O kristallisiert in Raumgruppe P21/m (a = 700.9(2), b = 726.1(1), c = 749.4(3) pm, β = 107.17(3)°, Z = 2). Beide Strukturen enthalten Jahn-Teller-verzerrte [Mn(H2O)2F4]-Anionen und zeigen ein komplexes Wasserstoffbrücken-Netzwerk zwischen Anionen und Kationen, nämlich [Mn(H2O)6]2+ in der ersteren und einem polymeren [Ag(H2O)2]--Kation in der zweiten Verbindung.
    Notes: Single crystals of fluoride hydrates Mn3F8 · 12 H2O and AgMnF4 · 4 H2O have been prepared and characterized by X-ray methods. Mn3F8 · 12 H2O crystallizes in the space group P1 (a = 623.0(3), b = 896.7(4), c = 931.8(4) pm, α = 110.07(2)°, β = 103.18(2)°, γ = 107.54(2)°, Z = 1); AgMnF4 · 4 H2O crystallizes in the space group P21/m (a = 700.9(2), b = 726.1(1), c = 749.4(3) pm, β = 107.17(3)°, Z = 2). Both structures contain Jahn-Teller-distorted [Mn(H2O)2F4]- anions as well as crystal water molecules and exhibit a complex hydrogen bond network between anions and cations, i. e. [Mn(H2O)6]2+ for the first and a polymeric [Ag(H2O)2]- cation for the second compound.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 0044-2313
    Keywords: Complex formation ; thermodynamic cycle ; vapour pressure ; bond energy ; cobalt(II) bromide ; pyridine ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Gasförmige Komplexe von Cobalt(II)-bromid und Pyridin.Die stufenweise Zersetzung von CoBr2py2(s) wurde auf einer Thermowaage mit der Methode der „modifizierten Mitführung“ untersucht und ergab Δ1H=88,6 kJ mol-1, Δ1S=156,6 JK-1 mol-1 und Δ2H=119.0 kJ mol-1, Δ2S=211,8 JK-1 mol-1 für die Dissoziation des ersten und zweiten Pyridins. Die Verdampfung von CoBr2py2(l) und die Bildung von CoBr2py2(g) aus CoBr2py(l) und gasförmigem Pyridin wurde zwischen 250 und 420°C spektrophotometrisch im Sichtbaren verfolgt. Zusammen mit Literaturwerten erlauben unsere Resultate einen vollständigen themodynamischen Kreisprozeß für das System CoBr2-Pyridin, fest-flüssig-gasförmig, aufzustellen. Daraus folgt, daß die Bildung von CoBr2py2 in Lösung nicht durch die Bindungsenergie Cobalt-Pyridin bestimmt wird, sondern durch die Solvatationsenergie der Reaktionspartner.
    Notes: The stepwise decomposition of CoBr2py2(s) has been investigated on a thermobalance by the “modified entrainment” method yielding Δ1H=88.6 kJ mol1, Δ1S=156.6 JK-1 mol-1 and Δ2H=119.0 kJ mol-1, Δ2S=211.8 JK-1 mol-1 for the dissociation of the first and second pyridine. The evaporation of CoBr2py2(l) and the association of gaseous pyridine to CoBr2py(l) forming CoBr2py2(g) has been studied by vis spectroscopy at 250-420°C. By combining the new results with literature values, a complete thermodynamic cycle for the solid-liquid-gas equilibria in the CoBr2-pyridine system could be established. It shows that in solution the formation of CoBr2py2 is not determined by the cobalt-pyridine bond energy but by the solvation energy of the rectants.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 0009-2940
    Keywords: Nitrilimines ; Phosphorus heterocycles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions involving the λ3-phosphorus atom of N-[bis(diisopropylamino)phosphanyl)]-C-[(bis(diisopropylamino) -thio-phosphoranyl)nitrilimine (1) are reported. Addition of elemental sulfur or selenium to 1 leads, by a formal [1 + 4] cycloaddition, to 1,3,4,2λ5-thiadiazaphosphole 3a or 1,3,4,2λ5-selenodiazaphosphole 3b in 85 and 84% yield, respectively. Reactions of 1 with dimethyl acetylenedicarboxylate and tetracyanoethylene afford the corresponding [2 + 4] adducts 1,2,3λ5-diazaphosphinine 6 (80% yield) and 1,2,4,3λ5-triazaphosphinine 10 (80% yield). Phenyl azide reacts with 1 with loss of nitrogen to give 1,2,4,3λ5-triazaphosphole 15 (74% yield), while the reaction of 1 with α-diazo ketone 17 leads with conservation of the N2 grouping to the formation of 1,2,4,3λ5-triazaphosphole 20 (85% yield). Addition of methyl trifluoromethanesulfonate to 1 affords N-[bis(diisopropylamino)methylphosphonioyl]-C-[bis(diisopropylamino)thiophosphoranyl]nitrilimine 22. In contrast to 1, the new stable nitrilimine 22 is strongly electrophilic. [2 + 3] cycloadditions are observed with ethyl vinyl ether, styrene, methyl acrylate and phenylacetylene to furnish the corresponding pyrazolines 23 - 25 and pyrazole 26 in good yields. Water adds to 22 by a 1,3-addition process to give hydrazine 27 (88% yield). The lithium salt 30 of [bis(diisopropyl-amino)thiophosphoranyl](diazo)methane reacts with [bis(pentafluorophenyl)](chloro)phosphane to afford the corresponding diazo compound 32 (50% yield) while the reaction with (chloro)(phenyl)[2,4,6-tris(trifluoromethyl)phenyl]phosphane furnishes nitrilimine 33 in 82% yield. Only 1,3-addition reactions with water or diisopropylamine leading to hydrazine 34 (65% yield) and hydrazone 35 (54% yield) are observed on treatment with this new poorly reactive nitrilimine.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...