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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 713-718 
    ISSN: 0044-2313
    Keywords: New Lithogermanate ; crystal structure ; MAPLE, CHARDI calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The First Oxogermanate with “Stuffed Pyrgoms”: CsNa3Li8{Li[GeO4]}4By heating the binary oxides CsO0.52, NaO0.45, LiO0.5 and GeO2 in the mol. ratio 1.24:1.4:6.7:3.9 (Ni tubes; 600°C/89 resp. 65 d) we obtained for the first time CsNa3Li8{Li[GeO4]}4 in form of pale yellow prisms as well as powder: space group I4/m (I. T. No. 87) with a = 1 120.73(5); c = 651.64(5) pm; Z = 2; (four circle diffractometer data; MoKα; 5 152 Io(hkl); R = 1.7%; Rw = 1.6%), parameters see text. The structure determination confirmes its being isotypic with CsKNaLi9{Li[SiO4]}4, CsKNa2Li8{Li[SiO4]}4 and RbNa3Li8{Li[SiO4]}4. The Madelung part of lattice energy (MAPLE), effective coordination numbers (ECoN), mean fictive ionic radii (MEFIR) and the charge distribution (CHARDI) are calculated.
    Notes: Durch Tempern der binären Oxide CsO0,52, NaO0,45, LiO0,5 und GeO2 im mol. Verhältnis 1,24:1,4:6,7:3,9 (Ni-Bömbchen; 600°C/89 bzw. 65 d) wurden erstmals Einkristalle von CsNa3Li8{Li[GeO4]}4 in Form von schwachgelblichen Prismen sowie blaßgelbem Pulver erhalten: Raumgruppe I4/m (I. T. Nr. 87) mit a = 1 120,73(5); c = 651,64(5) pm; Z = 2; (Vierkreisdiffraktometerdaten; Mo-Kα; 5 152 Io(hkl); R = 1,7%; Rw = 1,6%), Parameter siehe Text. Die Strukturbestimmung belegt die Isotypie mit CsKNaLi9{Li[SiO4]}4, CsKNa2Li8{Li[SiO4]}4 und RbNa3Li8{Li[SiO4]}4. Ferner werden der Madelunganteil der Gitterenergie (MAPLE), Effektive Koordinationszahlen (ECoN), Mittlere Fiktive Ionenradien (MEFIR) und die Ladungsverteilung (CHARDI) berechnet.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1069-1074 
    ISSN: 0044-2313
    Keywords: Cesium-gallium hydrogen triphosphate ; acentric crystal structure ; CHARDI ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zur azentrischen Kristallstruktur von CsGaHP3O10 der Form IIIDurch Kristallisation aus einer Polyphosphorsäure-Schmelze wurde CsGaHP3O10-III in Form farbloser, prismatisch-plättchenförmiger Einkristalle erhalten.Hier liegt die orthorhombische (azentrische) Raumgruppe Pca21 mit a = 1 176,3(1) pm, b = 496,55(5) pm, c = 1 572,2(1) pm und Z = 4 vor (1 268 symmetrieunabhängige Reflexe (Io 〉 2σ(Io)), 140 freie Parameter, wR2 = 0,0742 (SHELXL-93)).Isolierte P3O10-Ketten sind durch Ga zu Schichten parallel (0 0 1) verknüpft. Diese werden durch Cs sowie durch Wasserstoffbrücken untereinander verbunden. Die Schichten sind jeweils um c/2 voneinander getrennt.Diese neue Struktur wird mit den bereits bekannten von CsGaHP3O10-I und Cs3Ga3P12O36 verglichen. Weiterhin werden die Mittleren Fiktiven Ionenradien (MEFIR), die Effektiven Koordinationszahlen (ECoN) sowie die Ladungsverteilung nach dem CHARDI-Konzept berechnet und diskutiert.
    Notes: Cesium gallium hydrogen triphosphate CsGaHP3O10-III crystallizes in the space group Pca21, a = 1 176.3(1) pm, b = 496.55(5) pm, c = 1 572.2(1) pm and Z = 4.The structure was solved by using 1 268 unique reflections Io 〉 2σ(Io) with a final wR2 value of 0.0742 (SHELXL-93).The P3O10 chain anions, bonded by Ga, are spreaded in layers parallel (0 0 1); the layers are interconnected by Cspolyhedra and obviously by hydrogen bonds. The interlayer distance is c/2.The new structure is compared with the previously known structures of CsGaHP3O10-I and Cs3Ga3P12O36.Effective Coordination Numbers (ECoN), Mean Fictive Ionic Radii (MEFIR), and the Charge Distribution (CHARDI) are calculated for the title compound.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 561 (1988), S. 12-24 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the System CsF/CuF2: Cs4Cu3F10.By annealing of CsF and CuF2 under dried Ar [closed Au-tube, 630°C, 190 d] we received single crystals of hitherto unknown Cs4Cu3F10. They are nearly colorless, a blue tint is barely perceptible. The new fluoride crystallizes in the triclinic system (P1) with: a = 850.5(3) pm, b = 774.0(3) pm, c = 626.8(3) pm, α = 113.92(4)°, β = 111.84(4)°, γ = 103.12(4)° and Z = 1. Characteristical are units of three face shared octahedrons [Cu3F12]. The distances d(Cu—F) are ranging from 186.5 to 225.1 pm.The Madelung Part of Lattice Energie, MAPLE, is calculated and discussed, just so Effective Coordination Numbers, ECoN, these via Mean Fictive Ionic Radii, MEFIR.
    Notes: Erstmals konnten Einkristalle von Cs4Cu3F10 durch Tempern [geschlossenes Au-Rohr, 630°C, 190 d, alles unter Ar] von CsF und CuF2 erhalten werden. Sie sind fast farblos, ein Stich ins Blaue ist kaum merklich. Das neue Fluorocuprat(II) kristallisiert triklin (P1) mit: a = 850,5(3) pm, b = 774,0(3) pm, c = 626,8(3) pm, α = 113,92(4)°, β = 111,84(4)° und γ = 103,12(4)°, Z = 1. In charakteristischen [Cu3F12]-Einheiten sind drei Oktaeder flächenverknüpft. Die Abstände d(Cu—F) variieren von 186,5 bis 225,1 pm.Der Madelunganteil der Gitterenergie, MAPLE, wird (wie auch Effective Koordinationszahlen, ECoN, diese über Mittlere Fiktive Ionenradien, MEFIR) berechnet und diskutiert.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1447-1453 
    ISSN: 0044-2313
    Keywords: Cesium Sodium Titanate ; Rubidium Sodium Titanate ; Metatitanate ; Crystal Structure ; MAPLE ; CHARDI ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Two New Metatitanates with Five-coordinated Titanium: CsNaTiO3 and RbNaTiO3 [1]The new oxides CsNaTiO3 (I) and RbNaTiO3 (II) are obtained by heating well grounded mixtures of the binary oxides in Ni-tubes as colourless platelike crystals. I: CsO0.56, NaO0.48 and TiO2, Cs:Na:Ti = 1.1:1.1:1.0; 600°C, 61 d as well as CsO0.97, NaO0.48 and Ti2O3, Cs:Na:Ti = 1.5:3.0:1.0; 760°C, 27 d. II: RbO0.52, NaO0.48 and TiO2, Rb:Na:Ti = 1.1:1.1:1.0; 750°C, 14 d as well as RbO0.98, NaO0.48 and Ti2O3, Rb:Na:Ti = 1.5:3.1:1.0; 760°C, 27 d. CsNaTiO3 (orthorhombic, Cmcm) is nearly isostructural with KNaTiO3 [2]; a = 601.4(1) pm, b = 1 120.3(1) pm, c = 563.4(1) pm (Guinier-Simon-Data, Z = 4). RbNaTiO3 (monoclinic, C2/c) is isostructural with KNaTiO3; a = 590.3(1) pm, b = 1 098.4(1) pm, c = 555.1(0) pm, β = 92.15° (Guinier-Simon-Data, Z = 4). Both structures are determined by using four-circle diffractometer data (CsNaTiO3: Siemens AED2, 2 896Io(hkl), MoKα, R = 2.4%, Rw = 2.3%; RbNaTiO3: Philips PW 1 100, 2 743Io(hkl), AgKα, R = 9.9%, Rw = 8.9%; additional data see text).The Madelung Part of Lattice Energy (MAPLE), Effective Coordination Numbers (ECoN), Mean Fictive Ionic Radii (MEFIR) and the Charge Distribution in Solids are calculated and discussed.
    Notes: Die neuen Oxide CsNaTiO3 (I) und RbNaTiO3 (II) wurden durch Tempern inniger Gemenge der binären Oxide in Nickelzylindern als farblose plättchenförmige Kristalle erhalten. I: CsO0,56, NaO0,48 und TiO2, Cs:Na:Ti = 1,1:1,1:1,0; 600°C, 61 d sowie CsO0,97, NaO0,48 und Ti2O3, Cs:Na:Ti = 1,5:3,0:1,0; 760°C, 27 d. II: RbO0,52, NaO0,48 und TiO2, Rb:Na:Ti = 1,1:1,1:1,0; 750°C, 14 d sowie RbO0,98, NaO0,48 und Ti2O3, Rb:Na:Ti = 1,5:3,1:1,0; 760°C, 27 d.CsNaTiO3 (orthorhombisch, Cmcm) ist strukturell eng mit KNaTiO3 [2] verwandt; a = 601,4(1) pm, b = 1 120,3(1) pm, c = 563,4(1) pm (Guinier-Simon-Daten, Z = 4). RbNaTiO3 (monklin, C2/c) ist isotyp zu KNaTiO3; a = 590,3(1) pm, b = 1 098,4(1) pm, c = 555,1(0) pm, β = 92,15° (Guinier-Simon-Daten, Z = 4). Die Aufklärung beider Strukturen erfolgte mit Vierkreisdiffraktometerdaten (CsNaTiO3: Siemens AED2, 2 896Io(hkl), MoKα, R = 2,4%, Rw = 2,3%; RbNaTiO3: Philips PW 1 100, 2 743Io(hkl), AgKα, R = 9,9%, Rw = 8,9%; weitere Daten siehe Text).Für beide Verbindungen werden der Madelunganteil der Gitterenergie (MAPLE), Effektive Koordinatioszahlen (ECoN), Mittlere Fiktive Ionenradien (MEFIR) sowie die Ladungsverteilung (CHARDI) berechnet und diskutiert.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 564 (1988), S. 45-60 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Novel Oxoplumbates(II) with Isolated Anion Structure: Rb4[PbO3] and Cs4 [PbO3]For the first time Rb4[PbO3] have been prepared as single crystals. The structure determination (four-circle diffractometer data) [Rb4[PbO3]: 1818 I0 (hkl), MoKα, R = 6.49%, Rw = 6.83%, space group Pbca (a = 681.2(1), b = 1178.7(1), c = 1979,9(1) pm), Z = 8; Cs4[PbO3]: 3663 Io (hkl), AgKα, R = 11.35%, Rw = 9.82%, space group P21 (a = 1188.1(2), b = 734.4(1), c = 1176.2(2) pm, β = 111.52(2)°), Z = 4] proves in both cases the expected “isolated” [PbO3] groups. Comparing the oxides the arrangements of these groups shows surprising differences (see text). The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, have been calculated.
    Notes: Erstmals dargestellt wurden Rb4[PbO3] und Cs4[PbO3] in Form von Einkristallen. Nach der Strukturbestimmung mit Vierkreisdiffraktometerdaten [Rb4[PbO3]: 1818 I0 (hkl), Mokα, R = 6,49%, Rw = 6,83%, Raumgruppe Pbca (a = 681,2(1), b = 1178,7(1), c = 1979,9(1) pm), Z = 8; Cs4[PbO3]: 3663 Io (hkl), AgKα, R = 11,35%, Rw = 9,82%, Raumgruppe P21 (a = 1188,1(2), b = 734,4(1), c = 1176,2(2) pm, β = 111,52(2)°), Z = 4] liegen bei beiden Oxiden „isolierte“ [PbO3]-Gruppen von, deren Anordnung zueinander sich jedoch grundsätzlich unterscheidet, (Einzelheiten vgl. Text). Der Madelunganteil der Gitterenergie, MAPLE, und Effektive Koordinationszahlen, ECoN, werden angegeben.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 573 (1989), S. 133-142 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Oxotellurates(VI) of the Alkali Metals. Existence and Constitution of Li6TeO6For the first time Li6TeO6 is prepared as transparent, colourless single crystals, and the structure has been determined [four-circle diffractometer data, Siemens AED2, MoKα, 371 out of 371 IO(hkl), R = RW = 0.7%, R3, a = 791.99(6) pm, c = 696.44(7) pm, Z = 3].The structure refinement shows that Li6TeO6 is a variant of the NaCl-Typ. Nevertheless there is a relationship with α-Li6UO6 [2]. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, the latter derived from Mean Effective Fictive Ionic Radii, MEFIR, are calculated and discussed.
    Notes: Erstmals wurden klar durchscheinende, farblose Einkristalle von Li6TeO6 dargestellt und strukturell untersucht. [Vierkreisdiffraktometerdaten, Siemens AED2, MoKα-Strahlung, 371 von 371 IO(hkl), R = RW = 0,7%, R3, a = 791,99(6) pm, c = 696,44(7) pm, Z = 3].Die Strukturbestimmung zeigt, daß Li6TeO6 eine Variante des NaCl-Typs ist. Dennoch besteht Verwandtschaft mit α-Li6UO6 [2]. Der Madelunganteil der Gitterenergie, MAPLE, sowie Effektive Koordinationszahlen, ECoN, diese über Mittlere Effektive Ionenradien, MEFIR, werden berechnet und diskutiert.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 573 (1989), S. 157-169 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Two New Variants of the NaCl Type of Structure: On Li4MoO5 and Li4WO5For the first time in form of colourless, transparent single crystals of Li4MoO5 [annealed mixtures of Li2O and MoO3, Li:Mo = 4.2:1, Ni-cylinder, 950°C, 28 d] as well as Li4WO5 [annealed mixtures of Li2O and WO3, Li:W = 4.4:1, Au-tube, 950°C, 28 d, slowly cooling] have been prepared. Single crystal data show isotypic oxides of the Li4TeO5-type, a deformed variant of the NaCl-type of structure [Li4MoO5: 1379 IO(hkl), four-circle-diffraktometer Philips PW 1100, ω--2Θ scan, AgKα, R = 8.7% and RW = 8.3%, space group P1 with a = 511.9(1), b = 772.7(2), c = 506.4(1) pm, α = 101.70(1)°, β = 101.48(1)°, γ = 108.58(2)°, Z = 2 and Li4WO5: 1027 IO(hkl), Philips PW 1100, ω-2Θ scan, MoKα, R = 4.0% und RW = 3.7%, space group P1 with a = 510.94(5), b = 771.59(7), c = 506.09(4) pm, α = 101.804(8)°, β = 101.78(1)°, γ = 108.770(9)°, Z = 2]. The structural relations are deduced from Schlegel Diagrams. The Madelung Part of Lattice Energie, MAPLE, and Effective Coordination Numbers, ECON, these via Mean Fictive Ionic Radii, MEFIR, are calculated and discussed.
    Notes: Erstmals wurde in Form farbloser, transparenter Einkristalle Li4MoO5 [aus Gemengen von Li2O und MoO3. Li:Mo = 4,2:1, Ni-Bömbchen, 950°C, 28 d] sowie Li4WO5 [aus Gemengen von Li2O und WO3, Li:W = 4,4:1, Au-Rohr, 900°C, 30 d] dargestellt. Nach Einkristalldaten liegt bei den isotypen Oxiden vom Li4TeO5-Typ eine Ordnungsvariante des NaCl-Typs [Li4MoO5: 1379 IO(hkl), Vierkreisdiffraktometer Philips PW 1100, ω-2Θ scan, AgKα, R = 8,7% und RW = 8,3%, Raumgruppe P1 mit a = 511,9(1), b = 772,7(2), c = 506,4(1) pm, α = 101,70(1)°, β = 101,48(1)°, γ = 108,58(2)°, Z = 2 bzw. Li4WO5: 1027 IO(hkl), Philips PW 1100, ω-2Θ scan, MoKα, R = 4,0% und RW = 3,7%, Raumgruppe P1 mit a = 510,94(5), b = 771,59(7), c = 506,09(4) pm, α = 101,804(8)°, β = 101,78(1)°, γ = 108,770(9)°, Z = 2] vor.Die strukturellen Zusammenhänge werden aus den Schlegel-Diagrammen abgeleitet. Der Madelunganteil der Gitterenergie, MAPLE, sowie Effektive Koordinationszahlen, ECON, diese über Mittlere Fiktive Ionenradien, MEFIR, berechnet, werden mitgeteilt und diskutiert.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 586 (1990), S. 115-124 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Constitution of K3[FeO4]For the first time black orthorhombic single crystals of K3[FeO4] were prepared by heating well ground mixtures of the oxides (K2O2 and KFeO2 with K2O2:KFeO2 = 1.78:1.0, Ag-tube, 470°C, 18 d, 350°C, 5 d). Spacegroup Pnma with a = 770.16(13) pm, b = 909.20(17) pm, c = 783.70(14) pm.The structure has been determined by four-circle-diffractometer data [MoKα, 1241 of 1278 I0(hkl), R = 3.2%, Rw = 3.1%]; parameters as given in the text. The Madelung Part of the Lattice Energy, MAPLE, and the Effective Coordination Numbers, ECoN, these via Mean Fictive Ionic Radii, MEFIR, will be calculated and discussed.
    Notes: Erstmals wurde K3[FeO4] durch Tempern inniger Gemenge der Oxide (K2O2 und KFeO2 mit K2O2:KFeO2 = 1,78:1,0, Ag-Bömbchen, 470°C, 18 d, 350°C, 5 d) in Form von schwarzen, orthorhombischen Kristallen erhalten: Raumgruppe Pnma mit a = 770,16(13) pm, b = 909,20(17) pm, c = 783,70(14) pm.Die Struktur wurde mittels Vierkreisdiffraktometerdaten [MoKα, 1241 von 1278 I0(hkl), R = 3,2%, Rw = 3,1%] bestimmt; Parameter siehe Text. Der Madelunganteil der Gitterenergie, MAPLE, und Effektive Koordinationszahlen, ECoN, diese über Mittlere Fiktive Ionenradien, MEFIR, werden berechnet und diskutiert.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1019-1026 
    ISSN: 0044-2313
    Keywords: Rb2TiO3 ; Rubidium Metatitanate ; Crystal Structure ; MAPLE ; CHARDI ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: What does Solid State Mean?. New Molecular Aspects on the Example of Rb2[TiO3] [1], [2]Rb2TiO3 [3], parent type of the oxides K2CoO3, Rb2CoO3 and Cs2CoO3 [4], colourless crystals, needles, was newly obtained by heating a well grounded mixture of the binary oxides RbO0.98, RbO0.52, Ti2O3 (molar ratio = 2.4:6.2:1.0) 41 d at 780°C in Ni-Tubes.The first structure determination by using four-circle diffractometer data (Siemens AED2, 5366 Io(hkl), MoKα) leads to the residual-values R = 7.9% and Rw = 3.7%. Lattice constants (orthorhombic, Cmca, Z = 8, Guinier-Simon-data, CuKα1): a = 596.5(1) pm, b = 1185.2(1) pm, c = 1326.6(1) pm (additional data see text). The structure determination 1974 by filmdata is confirmed.The Madelung Part of Lattice Energy (MAPLE), Effective Coordination Numbers (ECoN), Mean Fictive Ionic Radii (MEFIR) and the Charge Distribution in Solids (CHARDI) are calculated and discussed.
    Notes: Rb2TiO3, [3], strukturell Muttertyp von Oxiden wie K2CoO3, Rb2CoO3 und Cs2CoO3 [4], farblose nadelförmige Kristalle, wurde durch 41tägiges Tempern inniger Gemenge der binären Oxide RbO0,98, RbO0,52 und Ti2O3 (molares Verhältnis = 2,4:6,2:1,0) in Ni-Zylindern bei 780°C erneut dargestellt.Diese erstmalige Strukturaufklärung mittels Vierkreisdiffraktometerdaten (Siemens AED2, 5366 Io(hkl), MoKα) führte zu den Residualwerten R = 7,9% und Rw = 3,7%. Gitterkonstanten (orthorhombisch, Cmca, Z = 8, Guinier-Simon-Daten, CuKα1): a = 596,5(1) pm, b = 1185,2(1) pm, c = 1326,6(1) pm (weitere Daten siehe Text). Die aus Filmdaten 1974 abgeleitete Struktur wird bestätigt.Der Madelunganteil der Gitterenergie (MAPLE), Effektive Koordinationszahlen (ECoN), Mittlere Fiktive Ionenradien (MEFIR) sowie die Ladungsverteilung (CHARDI) wurden berechnet und diskutiert.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1557-1563 
    ISSN: 0044-2313
    Keywords: Tin and Lead Tetrafluoride ; Synthesis ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Constitution of PbF4 with Structure Refinement of SnF4Colourless single crystals of SnF4 have been prepared heating powder samples of SnF4 in Pt-tubes (500°C, 20 d). Single crystals of PbF4 could be synthesized by pressure fluorination of «PbF4-x» and sublimation in autoclaves. The fluorides crystallize isostructural in space group I4/mmm with SnF4: a = 404.42(4) pm; c = 792.41(9) pm; Z = 2 and PbF4: a = 425.36(8) pm; c = 806.4(1) pm; Z = 2 (Guinier-de Wolff data, Cu-Kα1). The parameters ZF2 of both fluorides were refined from four-circle diffractometer data (Siemens AED 2) with SnF4: R1 = 1.5%; 1623 I0(hkl) and PbF4: R1 = 1.0%; 777 I0(hkl) (SHELXL-93). The structures correspond to the supposition by Hoppe and Dähne from 1962. The Madelung Part of Lattice and Molecule Energy, MAPLE and MAPME, Mean Fictive Ionic Radii, MEFIR, and Effective Coordination Numbers, ECoN, are calculated.
    Notes: Farblose Einkristalle von SnF4 wurden durch Tempern mikrokristalliner Proben in Pt-Rohr (500°C, 20 d), von PbF4 durch Druckfluorierung von ‚PbF4-x‘ und Sublimation im Fluorautoklaven bei 400°C erhalten. Die Fluoride kristallisieren isotyp in der tetragonalen Raumgruppe I4/mmm mit SnF4: a = 404,42(4) pm; c = 792,41(9) pm; Z = 2 und PbF4: a = 425,36(8) pm; c = 806,4(1) pm; Z = 2 (Guinier-de Wolff-Daten, Cu-Kα1). Die Parameter ZF2 wurden für beide Fluoride anhand von Vierkreisdiffraktometerdaten (Siemens AED 2) mit SnF4: R1 = 1,5%; 1623 I0(hkl) und PbF4: R1 = 1,0%; 777 I0(hkl) (SHELXL-93) verfeinert. Der Aufbau entspricht dem bereits 1962 von Hoppe und Dähne gemachten Vorschlag. Die Madelunganteile der Gitter- bzw. ‚Molekel‘-Energie, MAPLE bzw. MAPME, Mittlere Fiktive Ionenradien, MEFIR, sowie Effektive Koordinationszahlen, ECoN, werden berechnet.
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