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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and crystal structure of monoclinic Fe2(SeO4)3 (1991)
    Springer
    Monatshefte für Chemie 122 (1991), S. 617-623 
    Details
    ISSN: 1434-4475
    Keywords: Fe2(SeO4)3 ; Anhydrous ferric selenate(VI) ; Crystal structure ; Crystal chemistry ; Hydrothermal synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Kristalle von monoklinem Fe2(SeO4)3 wurden unter Hydrothermalbedingungen gezüchtet. Die Struktur wurde mit Einkristall-Röntgenmethoden bestimmt und in der Raumgruppe P21/n mit 2 646 unabhängigen Reflexen (sin θ/λ〈0.7Å−1) aufR=0.033,R w=0.037 verfeinert:a=8.530(2) Å,b=8.888(2) Å,c=11.952(2) Å, β=91.13(1)°,V=906.0 Å3,Z=4. Die Kristallstruktur ist isotyp mit der monoklinen Modifikation von Fe2(SO4)3, sie enthält zwei unterschiedliche Fe(III) und drei Se(VI) Atompositionen. Die FeO6-Polyeder sind nur gering verzerrt, die mittleren Fe-O Bindungslängen sind 1.986 Å und 2.004 Å, die mittleren Abstände in den SeO4-Tetraedern sind jeweils 1.628 Å. Die isolierten FeO6-Oktaeder sind nur über gemeinsame Ecken mit SeO4-Tetraedern verbunden, wobei eine Gerüststruktur entsteht.
    Notes: Summary Crystals of monoclinic Fe2(SeO4)3 were synthesized under hydrothermal conditions. The structure was determined by single crystal X-ray methods and refined in space group P21/n with 2 646 independent reflections (sin θ/λ〈0.7 Å−1) toR=0.033,R w=0.037:a=8.530 (2) Å,b=8.888 (2) Å,c=11.952 (2) Å, β=91.13 (1)°,V=906.0 Å3,Z=4. The crystal structure is isotypic with the monoclinic modification of Fe2(SO4)3, containing two different Fe(III) and three Se(VI) atomic positions. The FeO6 and SeO4 polyhedra are only slightly distorted, the mean Fe-O bond lengths are 1.986 Å and 2.004 Å, the average distances within the SeO4 tetrahedra are each 1.628 Å. The isolated FeO6 octahedra only share corners with SeO4 tetrahedra to build a framework structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811460
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of Tumor-Inhibiting Complex Salts Containing the Anion trans-Tetrachlorobis(indazole)ruthenate(III) and Crystal Structure of the Tetraphenylphosphonium Salt (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1551-1555 
    Details
    ISSN: 1434-1948
    Keywords: Ruthenium ; Coordination chemistry ; Paramagnetic complexes ; Magnetic properties ; Ion exchange ; Antitumor agents ; Colon tumors ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Indazolium trans-tetrachlorobis(indazole)ruthenate(III) exhibits excellent results against different tumor models in vitro and in vivo. To improve the water solubility necessary for the introduction of this tumor-inhibiting compound into clinical trials, we synthesized the corresponding sodium salt in a two-step ion exchange via the tetramethylammonium salt. The sodium salt shows a 35-fold higher solubility in water relative to the indazolium salt. We also synthesized the n-butylammonium, n-octylammonium, and tetraphenylphosphonium salts, all of which showed improved solubility in organic solvents. The X-ray crystal structure of the latter could be solved, proving the trans configuration of the complex anion. In spite of the paramagnetic RuIII center an assignement of the coordinated indazole protons could be made with the help of a COSY experiment.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Syntheses and Crystal Structures of Ca3Fe2(SeO3)6 and Sr3Fe2(SeO3)6 (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1788-1792 
    Details
    ISSN: 0044-2313
    Keywords: M3Fe2(SeO3)6 (M = Ca, Sr) ; crystal structure ; crystal chemistry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesen und Kristallstrukturen von Ca3Fe2(SeO3)6 und Sr3Fe2(SeO3)6Die neuen Verbindungen M3Fe2(SeO3)6 (M = Ca, Sr) wurden als kristalline Niederschläge aus wäßrigen Lösungen der jeweiligen Ionen erhalten, die in Teflon-beschichteten Behältern für mehrere Tage auf eine Temperatur von 227(2)°C erhitzt wurden.Die kristallographischen Daten sind: Raumgruppe R3c, a = 8,531(2), 8,802(2) Å; c = 38,89(1), 39,00(1) Å; V = 2451,1, 2616,7 Å3, Z = 6. Die Kristallstrukturen wurden aus Einkristallröntgenbeugungsdaten bestimmt und zu R-Werten von R1 = 0,021, 0,023; wR2 = 0,038, 0,039 verfeinert. Die Gerüststruktur besteht aus zwei Arten von FeO6 Oktaedern sowie aus MO8 Gruppen und SeO3 trigonalen Pyramiden, die über gemeinsame Ecken und Kanten verbunden sind.
    Notes: The new compounds M3Fe2(SeO3)6 (M = Ca, Sr) were obtained as crystalline precipitates from aqueous solutions of the respective ions, kept in Teflon-coated vessels at a temperature of 227(2)°C for several days.The crystal data are: space group R3c, a = 8.531(2), 8.802(2) Å; c = 38.89(1), 39.00(1) Å; V = 2451.1, 2616.7 Å3, Z = 6. The crystal structures have been refined by single-crystal X-ray diffraction methods to R1 = 0.021, 0.023; wR2 = 0.038, 0.039. The framework structure is built up by two types of FeO6 octahedra as well as by MO8 groups and SeO3 trigonal pyramids by corner- and edge-linkage of the polyhedra.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966221025
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