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  • Articles: DFG German National Licenses  (2)
  • Ethylenediammonium selenostannates(IV)  (1)
  • Potassium  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 4 (1986), S. 93-98 
    ISSN: 1573-1111
    Keywords: Potassium ; benzo-15-crown-5 ; sandwich complex ; counteracting anion effect ; X-ray structural analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The 1:2 charge separated KNO3 complex with benzo-15-crown-5 (B15C5) has been crystallized from a 50% water-methanol solution. K(B15C5)2NO3·H2O is monoclinic,P21/c,a=12.717(2),b=19.569(2),c=13.025(3) Å, β=100.79(1)o,Z=4,D c =1.37 g·cm−3. The X-ray structure was refined toR=0.052 for 3049 independent reflections withF 0 2 ≥2.0σ(F 0 2 ), collected with MoK α radiation for a 2 θ-range of 4–44°. The K+ ion is coordinated tenfold in a crown sandwich through all five oxygen atoms of the macrocyclic ligand. Nitrate and water oxygens are not involved in the cation coordination sphere.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1300-1306 
    ISSN: 0044-2313
    Keywords: Ethylenediammonium selenostannates(IV) ; preparation ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Ethylenediammonium Selenostannates(IV) and [2 SnSe2 · en]∞The selenostannates(IV) [enH2]2[Sn2Se6] · en 1 and [enH2][Sn3Se7] · 1/2en 2 have been prepared by the methanolothermal reaction of SnSe2 with ethylenediamine (en) (160°C, 13 bar) in the presence of respectively Se or BaSe. The [Sn2Se6]4- anion in 1 consists of two edgebridged SnSe4 tetrahedra and displays crystallographic Ci symmetry. The crystal structure of 2 contains polyselenostannate(IV) sheet anions [Sn2Se72]∞2, for which the basic elements are trigonal SnSe5 bipyramids. Each of the three symmetry independent Sn atoms is linked to the other Sn atoms via Sn—Se—Sn bridges leading to the formation of Sn3Se10 units. Methanolothermal reaction of SnSe2 with en alone yields the edge-bridged chain structure [2 SnSe2 ∞2 en]∞ 3, in which each of the Sn atoms is bonded to four Se atoms. Every second Sn atom is also coordinated by an en molecule and displays, therefore, an octahedral geometry. The remaining Sn atoms are coordinated tetrahedrally by Se atoms.
    Notes: Die Selenostannate(IV) [enH2]2[Sn2Se6] · 1/2 en 1 und [enH2][Sn3Se7] · 1/2en 2 wurden durch methanolothermale Reaktion von SnSe2 mit Ethylendiamin (en) (160°C, 13 bar) in Anwesenheit von Se bzw. BaSe dargestellt. Das Anion [Sn2Se6]4- in 1 besteht aus zwei kantenverknüpften SnSe4-Tetraedern und weist kristallographische Ci-Symmetrie auf. Im Kristallgitter von 2 liegen schichtartige Polyanionen [Sn3Se72]∞2 vor, die trigonale SnSe5-Bipyramiden als Baueinheiten aufweisen. Die drei symmetrieunabhängigen Zinnatome sind jeweils über Sn—Se—Sn—Brücken miteinander verknüpft, so daß Sn3Se10-Einheiten entstehen. Die methanolothermale Umsetzung von SnSe2 mit en allein liefert die kantenverknüpfte Kettenstruktur [2 SnSe2 · en]∞ 3, in der die Zinnatome jeweils von vier Selenatomen koordiniert sind. Jedes zweite Zinnatom wird zusätzlich von einem en-Molekül koordiniert und weist somit eine verzerrte oktaedrische Geometrie auf. Die restlichen Zinnatome sind tetraedrisch von Se-Atomen umgeben.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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