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  • Chemistry  (20)
  • Copper weberites, Na2CuGaF7, Na2CuInF7  (1)
  • IR Spectra
  • 1990-1994  (11)
  • 1970-1974  (4)
  • 1965-1969  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 387 (1972), S. 161-178 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The results of X-ray single crystal work on RbNiCrF6 (a = 10.21 Å) and of powder work on KNiCrF6 (a = 10.24 Å) and KNiCrF6 · H2O (a = 10.45 Å) are reported. All three compounds crystallize cubically in the space group Fd3m. They contain a network M2X6 of octahedra, analogous to that of the pyrochlores and with distances Ni-F = Cr-F = = 1.93 ± 0.02 Å which are equal within the error of determination. The structural relations between the three compounds, and compared with the pyrochlore structure are discussed, as well as the relations to the tetragonal bronze-type structure occuring as a high pressure phase of KNiCrF6.
    Notes: Die Ergebnisse einer Einkristallstrukturbestimmung an RbNiCrF6(a = 10,21 Å) und von Pulvermessungen an KNiCrF6 (a = 10,24 Å) und KNiCrF6 · H2O (a = 10,45 Å) werden mitgeteilt. Alle drei Verbindungen kristallisieren kubisch in der Raumgruppe Fd3m und enthalten ein den Pyrochloren analoges Oktaedernetz M2X6 mit innerhalb der Fehlergrenze gleichen Abständen Ni-F = Cr-F = 1,93 ± 0,02 Å. Die strukturellen Beziehungen der drei Verbindungen untereinander und zur Pyrochlorstruktur werden diskutiert, ebenso zur tetragonalen Bronzestruktur, die als Hochdruckphase von KNiCrF6 auftritt.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 406 (1974), S. 23-37 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of the Quaternary Fluoride BaLiCrF6The crystal structure of the monoclinic compound BaLiCrF6 was determined (a = 5.397, b = 10.355, c = 8.638 Å, β = 90.72°; SG P21/c, z = 4. R = 5.7% for all 1561 automatically recorded single crystal reflections hkl). The structure contains icosahedra of BaF12 (Ba-F = 2.890 Å) within a framework built up of isolated LiF4-tetrahedral (Li-F = 1.868 Å) and CrF6-octahedra (Cr-F = 1.903 Å) mutually linked by corners. All polyhedra are distorted. Structural relations and the variation of distances about the mean values given are discussed.
    Notes: Die Kristallstruktur der monoklinen Verbindung BaLiCrF6 wurde bestimmt (a = 5,397, b = 10,355, c = 8,638 Å, β = 90,72°; RG P21/c, z = 4. R = 5,7% für alle 1561 automatisch registrierten Einkristall-Reflexe hkl). Die Struktur enthält BaF12-Ikosaeder (Ba-F = 2,890 Å) innerhalb eines Raumnetzes, das aus isolierten LiF4-Tetraedern (Li-F = 1,868 Å) und CrF6-Oktaedern (Cr-F = 1,903 Å) besteht, die gegenseitig über Ecken miteinander verknüpft sind. Alle Polyeder sind verzerrt. Strukturbeziehungen sowie die Variation der Abstände um die angegebenen Mittelwerte werden diskutiert.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 406 (1974), S. 38-44 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigation of Quaternary Fluorides LiMIIMIIIF6. Some Compounds of the BaLiCrF6 TypeSome monoclinically crystallizing compounds BaLiMIIIF6 (MIII = Al, Ga, Cr, V, Fe, Ti) are reported. Part of the lithium, which is tetrahedrally coordinated in the BaLiCrF6-type structures, could be replaced by Co(II) ions in solid solutions BaLiGaF6/KCoGaF6. The reflectance spectrum of tetrahedral CoF42- is given.
    Notes: Es wird über eine Reihe monoklin kristallisierender Verbindungen der Zusammensetzung BaLiMIIIF6 (MIII = Al, Ga, Cr, V, Fe, Ti) berichtet. Das in den Strukturen vom BaLiCrF6-Typ tetraedrisch koordiniert vorliegende Lithium ließ sich in Mischkristallen BaLiGaF6/KCoGaF6 partiell durch Co(II)-Ionen ersetzen. Das Reflexionsspektrum von tetraedrischem CoF42- wird mitgeteilt.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 409 (1974), S. 11-22 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Redetermination of the K2CuF4 StructureThe structure of K2CuF4 was redetermined by x-rays. An enlarged tetra-gonal unit cell of dimensions a = 5.858, c = 25.42 Å was found. The refinement in spacegroup D102d-I4c2 yielded R = 0.06. Contrary to former findings the JAHN-TELLER- distortion of the CuF6-octahedra corresponds to a tetragonal elongation with distances Cu-F = 1.92 Å (4 ×) and 2.22 Å(2×).
    Notes: Die röntgenographische Neubestimmung ergab für die K2CuF4- Struktur eine Vergrößerung der tetragonalen Elementarzelle auf die Gitterabmessungen a = 5,858, c = 25,42 Å. In der Raumgruppe D102d-I4c2 ließ sich die Struktur bis R = 0,06 verfeinern. Im Gegensatz zu früheren Befunden erweist sich die JAHN-TELLER-Verzerrung CuF6-Oktaeder jetzt auch hier als gestreckt. Im Rahmen der Bestimmungsgenauigkeit sind alle Oktaeder tragonal mit Abständen Cu-F = 1,92 Å (4×) und 2,22 Å (2×).
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 39 (1967), S. 812-815 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Die Zylindermethode nach Gouy gestattet bei Verwendung einer registrierenden Magnetwaage die kontinuierliche Aufzeichnung der Gewichtsänderungen, die eine Probe im Magnetfeld in Abhängigkeit von ihrer Temperatur erfährt. Eine Einrichtung zur automatischen, linearen Aufheizung der Probe von - 180 bis + 180°C wird beschrieben. In dem genannten Bereich kann so der Temperaturverlauf der magnetischen Suszeptibilität lückenlos aus den Meßkurven ermittelt werden.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 80 (1968), S. 199-199 
    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 die chemische Industrie 78 (1966), S. 451-451 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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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: Jahn-Teller Effect and Crystal Structure Distortion of the Copper Fluoroperovskites NaCuF3 and RbCuF3The crystal structures of triclinic NaCuF3 (a = 539.1, b = 555.2, c = 792.8 pm, α = 90.66, β = 92.05, γ = 86.95°; P1, Z = 4) and of tetragonal RbCuF3, isotypic with KCuF3, (a = 602.3, c = 791.2 pm; I4/mcm, Z = 4), were determined by x-ray methods and refined to wR = 0.038 (2113 reflections) resp. 0.039 (257 reflections). The structures derive from orthorhombic (GdFeO)3 and cubic perovskite type, resp., by Jahn-Teller distortion. The CuF64- octahedra, differently elongated in the two compounds (average NaCuF3: Cu—F = 188.9/197.3/225.6(2) pm; RbCuF3: 188.3/197.8/237.6(3) pm), show the same pattern of antiferrodistortive ordering, but there are bent bridges Cu—F—Cu = 144.2…148.0(1)° in NaCuF3. Structural relations to the prototypes mentioned and to comparably Jahn-Teller distorted copper fluoro compounds are discussed.
    Notes: Die Kristallstrukturen des triklinen NaCuF3 (a = 539,1, b = 555,2, c = 792,8 pm, α = 90,66, β = 92,05, γ = 86,95°; P1, Z = 4) und des tetragonalen, mit KCuF3 isotypen RbCuF3 (a = 602,3, c = 791,2 pm; I4/mcm, Z = 4) wurden röntgenographisch bestimmt und auf wR = 0,038 (2113 Reflexe) bzw. 0,039 (257 Reflexe) verfeinert. Die Strukturen leiten sich vom orthorhombischen (GdFeO3-) bzw. kubischen Perowskit-Typ durch Jahn-Teller-Verzerrung ab. Die in beiden Verbindungen unterschiedlich gestreckten CuF64--Oktaeder (Mittelwert NaCuF3: Cu—F = 188,9/197,3/225,6(2) pm; RbCuF3: 188,3/197,8/237,6(3) pm) sind nach demselben Muster antiferrodistortiv geordnet, jedoch unter Winkelung Cu—F—Cu = 144,2…148,0(1)° in NaCuF3. Strukturelle Beziehungen zu den genannten Prototypen und zu vergleichbar Jahn-Teller-verzerrten Kupfer-Fluorverbindungen werden diskutiert.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 600 (1991), S. 239-248 
    ISSN: 0044-2313
    Keywords: Cyano-elpasolites ; bis(-tetramethylammonium) alkali hexacyanometallates ; preparation ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetragonal Cyano-Elpasolites: The Crystal Structures of [N(CH3)4]2KMn(CN)6 and [N(CH3)4]2RbCo(CN)6The tetragonal bis(-tetramethylammonium)-alkali-hexacyanometallates [N(CH3)4]2KMn(CN)6 (a = 884.8(2), c = 1222.2(6) pm) and [N(CH3)4]2RbCo(CN)6 (a = 884.7(1), c = 1233.1(2) pm) were prepared in the form of single crystals and their structures determined by X-ray methods (wR = 0.050 and 0.047 for 486 and 463 independent reflections, respectively; space group 14/m, Z = 2). The average distances in the resulting elpasolite structure, which is but slightly tetragonally distorted by small ferro-rotative displacements of the [M(CN6]3-) octahedra (Mn—C = 201.8, C—N = 115.6, K—N = 307.1 pm resp. Co—C = 190.7, C—N = 114.8, Rb—N = 320.1 pm), seem a bit enlarged if compared to related cyano complexes. Reasons for this are discussed using a tolerance factor concept for cyanoepasolites.
    Notes: Die tetragonalen Bis(-tetramethylammonium)-Alkali-Hexacyanometallate [N(CH3)4]2KMn(CN)6 (a = 884.8(2), c = 1222,2(6) pm) und [N(CH3)4]2RbCo(CN)6 (a = 884,7(1), c = 1233,1(2) pm) wurden in Form von Einkristallen dargestellt und röntgenographisch ihre Strukturen bestimmt (wR = 0,050 bzw. 0,047 für 486 bzw. 463 unabhängige Reflexe; Raumgruppe 14/m, Z = 2). Die mittleren Abstände in der resultierenden Elpasolithstruktur, die durch geringe ferrorotative Drehung der [M(CN)6]3--Oktaeder nur wenig tetragonal verzerrt ist (Mn—C = 201,8, C—N = 115,6, K—N = 307,1 pm bzw. Co—C = 190,7, C—N = 114,8, Rb—N = 320,1 pm), erscheinen leicht vergrößert im Vergleich zu Werten die in verwandten Cyanokomplexen beobachtet wurden. Gründe dafür werden im Rahmen einer Toleranzfaktorbetrachtung für Cyano-Elpasolithe diskutiert.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 610 (1992), S. 67-74 
    ISSN: 0044-2313
    Keywords: Copper weberites, Na2CuGaF7, Na2CuInF7 ; crystal structure ; magnetic investigation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Kupferweberite: Kristallstruktur und magnetische Untersuchung von Na2CuGaF7 und Na2CuInF7Die Kristallstruktur von zwei neuen Kupferweberiten Na2CuGaF7 und Na2CuInF7 wurde bestimmt. Na2CuGaF7: monokline Raumgruppe C2/c; a = 1232,5(5), b = 731,8(1), c = 1278,0(5) pm, β = 109,29(2)°, Z = 8. Na2CuInF7: orthorhombische Raumgruppe Pmnb; a = 731,8(1) pm, b = 1060,2(2) pm, c = 771,2(1) pm Z = 4. Die Strukturen wurden verfeinert mit 1175 Reflexen bis zu R = 0,043 (wR = 0,035) für Na2CuGaF7 und mit 1917 Reflexen bis zu R = 0,034 (wR = 0,025) für Na2CuInF7. Die Strukturen bestehen aus [CuF5]n3n--Ketten, die im Na2CuInF7 parallel zur a-Achse orientiert sind und in zwei alternierenden Richtungen im Na2CuGaF7. Die Natriumatome besitzen entweder siebenfache oder achtfache Koordination. Obwohl starke antiferromagnetische Wechselwirkungen innerhalb der Ketten beobachtet werden, gibt es keine Hinweise auf eine dreidimensionale Ordnung.
    Notes: The crystal structures of two new copper weberites Na2CuGaF7 and Na2CuInF7 have been determined. Na2CuGaF7 has the monoclinic space group C2/c: a = 1232.5(5) pm, b = 731.8(1) pm, c = 1278.0(5) pm, β = 109.29(2)° and Z = 8. Na2CuInF7 crystallizes in the orthorhombic space group Pmnb: a = 731.8(1) pm, b = 1060.2(2) pm, c = 771.2(1) pm and Z = 4. The structures have been refined from 1175 reflections to R = 0.043 (wR = 0.035) for Na2CuGaF7, and from 1917 reflections to R = 0.034 (wR = 0.025) for Na2CuInF7. The structures consist of [CuF5]n3n- chains which are parallel the a-axis in Na2CuInF7 and oriented in two alternating directions in Na2CuGaF7. Sodium atoms exhibit either seven-fold or eight-fold coordination. Although strong antiferromagnetic interactions are observed inside the chains, there is no evidence for three-dimensional ordering.
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