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  • 1
    ISSN: 0044-2313
    Keywords: Weberite ; crystal structure ; nickel aluminium fluoride ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structure of Na2NiAlF7  -  a Contribution to the Problem of the True Space Group of Orthorhombic WeberitesThe X-ray single crystal structure determination of the orthorhombic weberite Na2NiAlF7 (a = 707.4(2), b = 1003.8(2), c = 731.5(1) pm; Z = 4) was performed in space group Imma, after all reflections hk0 with h(k) = 2n + 1 could be eliminated, as they proved simulated by Renninger effect and/or λ/2 reflections. The alternative space groups Imm2 resp. I212121 of former weberite structure determinations thus became obsolete. The refinement using 880 independent reflections ended at wR = 0.0232. The resulting average distances within the framework of octahedra are Ni—F = 197.3, Al—F = 180.4 pm.
    Notes: Die Röntgen-Einkristallstrukturbestimmung des orthorhombischen Weberits Na2NiAlF7 (a = 707,4(2), b = 1003,8(2), c = 731,5(1) pm; Z = 4) wurde in der Raumgruppe Imma vorgenommen, nachdem alle Reflexe hk0 mit h(k) = 2n + 1 eliminiert werden konnten, weil sie sich durch Renninger-Effekt und/oder λ/2-Reflexe als vorgetäuscht erwiesen. Damit wurden die alternativen Raumgruppen Imm2 bzw. I212121 früherer Weberit-Strukturbestimmungen obsolet. Die Verfeinerung mit 880 unabhängigen Reflexen schloß ab mit wR = 0,0232. Die resultierenden Mittelwerte für die Abstände im Oktaedernetz betragen Ni—F = 197,3 pm, Al—F = 180,4 pm.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 609 (1992), S. 71-76 
    ISSN: 0044-2313
    Keywords: Thallium tetrafluoromanganate(III), TlMnF4 ; crystal structure ; magnetic structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Kristall- und magnetische Struktur von TlMnF4, einer Verbindung mit SchichtstrukturDie Kristallstruktur und die magnetischen Eigenschaften des Fluoromanganates(III) TlMnF4 wurden untersucht. Die Struktur wurde in der monoklinen Raumgruppe I2/a, Elementarzelle mit a = 539,7(2); b = 544,1(2); c = 1248,4(5) pm, β = 90,19(3)° (Z = 4) auf R/wR 0,057/0,043 verfeinert. TlMnF4 zeigt eine Schichtstruktur, die durch Eckenverknüpfung von MnF6-Oktaedern über ihre vier äquatorialen Ecken gebildet wird. Die Mn—F-Abstände innerhalb des Oktaeders liegen im Bereich von 178 bis 215 pm. Die magnetische Austauschenergie (J/K) innerhalb der Schicht wurde durch Anpassung der experimentellen Suszeptibilitätsdaten im Temperaturbereich von 10-300 K auf der Basis des Heisenbergmodells für quadratische Schichten zu -0,45 K bestimmt. Dreidimensionale antiferromagnetische Ordnung tritt bei 4,2(5) K ein. Die magnetische Zelle entspricht der kristallographischen, jedoch mit primitivem Translationsgitter. Die magnetische Struktur wurde auf R = 0,058 in der magnetischen Raumgruppen P2′/a′ verfeinert. Die magnetischen Momente an MnIII sind colinear zur b-Achse und zeigen antiparallele Ordnung innerhalb der Schichten.
    Notes: The crystal structure and the magnetic properties of the fluoromanganate(III) TlMnF4 have been investigated. The structure has been refined down to R/wR of 0.057/0.043 in the monoclinic I2/a space group with the unit cell constants a = 539.7(2) pm; b = 544.1(2) pm; c = 1248.4(5) pm; β = 90.19(3)° (Z = 4). TlMnF4 is characterized by a layer structure formed of MnF6 octahedra sharing their four equatorial corners. Within each octahedron the Mn—F distances range from 178 pm to 215 pm. The intralayer magnetic interaction (J/K) has been evaluated to be approximately -0.45 K by fitting the experimental susceptibility in the 10-300 K range using the quadratic layer Heisenberg model. A 3 D-antiferromagnetic ordering occurs at Tn = 4.2(5) K. The magnetic cell corresponding to the nuclear one but with a primitive symmetry. The magnetic structure has been refined down to R = 0.0528 in the P2′/a′ magnetic group. The MnIII moments are colinear to the b-axis and show antiparallel ordering within the layers.
    Additional Material: 6 Ill.
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 610 (1992), S. 112-116 
    ISSN: 0044-2313
    Keywords: Nitrosyl-fluoride complex of rhenium ; synthesis ; IR spectrum ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: [Na(15-crown-5)][ReFCl3(NO)(CH3CN)] Synthesis, IR Spectrum, and Crystal StructureThe title compound has been prepared by the reaction of [ReCl3(NO)2(CH3CN)] with the equivalent amount of sodium fluoride in the presence of 15-crown-5 in boiling acetonitrile, forming blue crystals. They were characterized by IR spectroscopy and by an X-ray structure determination. Space group P21/n, Z = 4,2117 observed independent reflections, R = 0.037, wR = 0.029. Lattice dimensions at 20°C: a = 834.0(2), b = 1600.0(3), c = 1670.0(3) pm; β = 104.19(3)°. The compound forms an ion pair via one Na—F contact of 234.4 pm and one Na—Cl contact of 293.4 pm; the nitrosyl ligand ist in trans-position to the F atom of the anion [ReFCl3(NO)(CH3CN)]-.
    Notes: Die Titelverbindung wird aus [ReCl3(NO)2(CH3CN)] mit der äquivalenten Menge Natriumfluorid bei Gegenwart von 15-Krone-5 in siedendem Acetonitril in Form blauer Kristalle hergestellt und durch das IR-Spektrum und eine Kristallstrukturanalyse charakterisiert. Raumgruppe P21/n, Z = 4, 2117 beobachtete unabhängige Reflexe, R = 3,7%, wR = 2,9%. Gitterabmessungen bei 20°C: a = 834,0(2); b = 1600,0(3); c = 1670,0(3) pm; β = 104,19(3)°. Die Verbindung bildet ein Ionenpaar mit einem Na—F-Kontakt von 234,4 pm und einem Na—Cl-Kontakt mit 293,4 pm; der Nitrosylligand befindet sich in trans-Stellung zum Fluorliganden des [ReFCl3(NO)(CH3CN)]--Ions.
    Additional Material: 2 Ill.
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  • 5
    ISSN: 0044-2313
    Keywords: Fluorometallates ; crystal structure ; hydrogen bonds ; phenylenediammonium salts ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrogen Bonds in o- and m-Phenylenediammonium Aquapentafluoro Metallates(III) (MIII = Al, Cr, Fe)m- and o-Phenylenediammonium-[MIIIF5(H2O)] compounds of Al, Cr and Fe were synthesized and characterized by X-ray single crystal structure analysis. All structures are described in the space group P212121 (Z = 4). m-Ph(NH3)22+ (Ph(NH3)22+ = phenylenediammonium) compounds: Al: a = 6.489(2), b = 7.943(2), c = 18.204(2) Å, R/wR = 0.084/0.050 for 1 533 reflections; Cr: a = 6.571(2), b = 8.006(2), c = 18.456(3) Å, R/wR = 0.050/0.040 for 1 571 reflections; Fe: a = 6.608(2), b = 8.052(2), c = 18.424(4) Å, R/wR = 0.042/0.034 for 1 947 reflections. o-Ph(NH3)22+ compounds: Al: a = 6.580(2), b = 7.891(2), c = 18.319(5) Å, R/wR = 0.050/0.045 for 2 370 reflections; Cr: a = 6.642(2), b = 7.954(2), c = 18.484(4) Å, R/wR = 0.065/0.043 for 2 041 reflections; Fe: a = 6.693(2), b = 7.995(4), c = 18.529(7) Å, R/wR = 0.035/0.033 for 2 651 reflections. Isolated distorted octahedral [MIIIF5(H2O)]2- anions are connected by double O—H⃛F hydrogen bonds of alternating strength to form chains in the b direction. Those chains, packed in a pseudohexagonal way, are further linked by the ammonium functions of the phenylenediammonium cations to a 3 D hydrogen bond network.
    Notes: m- und o-Phenylendiammonium-[MIIIF5(H2O)]-Verbindungen von Al, Cr und Fe wurden synthetisiert und durch Röntgenstrukturbestimmungen an Einkristallen charakterisiert. Die Strukturen werden alle in der Raumgruppe P212121 (Z = 4) beschrieben. m-Ph(NH3)22+-Verbindungen (Ph(NH3)22+ = Phenylendiammonium): Al: a = 6,489(2), b = 7,943(2), c = 18,204(2) Å, R/wR = 0,084/0,050 für 1 533 Reflexe; Cr: a = 6,571(2), b = 8,006(2), c = 18,456(3) Å, R/wR = 0,050/0,040 für 1 571 Reflexe; Fe: a = 6,608(2), b = 8,052(2), c = 18,424(4) Å, R/wR = 0,042/0,034 für 1 947 Reflexe. o-Ph(NH3)22+-Verbindungen: Al: a = 6,580(2), b = 7,891(2), c = 18,319(5) Å, R/wR = 0,050/0,045 für 2 370 Reflexe; Cr: a = 6,642(2), b = 7,954(2), c = 18,484(4) Å, R/wR = 0,065/0,043 für 2 041 Reflexe; Fe: a = 6,693(2), b = 7,995(4), c = 18,529(7) Å, R/wR = 0,035/0,033 für 2 651 Reflexe. Isolierte verzerrt oktaedrische [MIIIF5(H2O)]2- Anionen werden durch doppelte O—H…F H-Brückenbindungen alternierender Stärke zu Ketten in b-Richtung verknüpft.Diese pseudohexagonal gepackten Ketten werden durch die Ammoniumfunktionen der Phenylendiammonium-Kationen über weitere H-Brücken dreidimensional vernetzt.
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