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  • Chromium  (1)
  • Copper weberites, Na2CuGaF7, Na2CuInF7  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Zur Strukturchemie der Verbindungen Cs[MF4(H2O)2] (M = Al, Cr, Mn, Fe) (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 593 (1991), S. 207-216 
    Details
    ISSN: 0044-2313
    Keywords: Cesium Diaquatetrafluoro Metallates ; Aluminium ; Chromium ; Manganese ; Iron ; Crystal Structure ; IR Spectra ; Thermochemistry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structural Chemistry of Compounds Cs[MF4(H2O)2] (M = Al, Cr, Mn, Fe)The compounds Cs[MF4(H2O)2] (M = Al, Br, Fe) have been prepared and the structures explored by means of X-ray diffraction, in the case of the Al compound on a single crystal. They crystallize isotypic with Rb[VF4(H2O)2] and Cs[MnF4(H2O)2] in space group I2/a, Z = 4 [Cs]AlF4(H2O)2: a = 882.4(3); b = 667.8(1); c = 1 002.4(3) pm; β = 105.14°; R = 0.025 for 1685 reflections. Cs[CrF4(H2O)2]: a = 895.3; b = 669.1; c = 1 014.5; β = 104.40°. Cs[FeF4(H2O)2]: a = 906.6; b = 673.1; c = 1 027.2; β = 104.73°). The [AlF4(H2O)2]- anions with trans aqua ligands are linked via strong H-bonds (O…F 257-251 pm) to form chains which are further connected to a 3-dim. network. This is expressed as well in the i.r. spectra. The thermal decomposition leads, in one step, to the water free tetrafluorometallates.
    Notes: Die Verbindungen Cs[MF4(H2O)2] (M = Al, Cr, Fe) wurden dargestellt und ihre Strukturen röntgenographisch - im Falle der Al-Verbindung an einem Einkristall - untersucht. Sie kristallisieren isotyp zu Rb[VF4(H2O)2] und Cs[MnF4(H2O)2] in Raumgruppe I2/a, Z = 4 [Cs[AlF4(H2O)2]]: a = 882,4(3); b = 667,8(1); c = 1 002,4(3) pm; β = 105,14°; R = 0,025 für 1 685 Reflexe. Cs[CrF4(H2O)2]: a = 895,3; b = 669,1; c = 1 014,5; β = 104,40°. Cs[FeF4(H2O)2]: a = 906,6; b = 673,1; c = 1 027,2; β = 104,73°). Die [AlF4(H2O)2]--Anionen mit transständigen Aqualiganden sind über starke H-Brücken (O…F 257-261 pm) zu dreidimensional vernetzten Ketten miteinander verbunden. Dies kommt auch in den IR-Spektren zum Ausdruck. Die thermische Zersetzung führt einstufig zu den wasserfreien Tetrafluorometallaten.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915930121
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  • 2
    Electronic Resource
    Electronic Resource
    Copper Weberites: Crystal Structure and Magnetic Investigation of Na2CuGaF7 and Na2CuInF7 (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 610 (1992), S. 67-74 
    Details
    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.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926100112
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    Paper (German National Licenses)
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