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  • 1
    Electronic Resource
    Electronic Resource
    The structure of a potassium-copper complex with six-membered macrocyclic ethylsiloxanolate ligands (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 718-722 
    Details
    ISSN: 1573-9171
    Keywords: metal siloxanolates ; macrocyclic complexes ; organosilicon compounds ; copper(2+) complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The structure of K2{[EtSiO2]6K2Cu4[O2SiEt]6} · 4n-BuOH, a novel mixed sandwich-like complex of K+ and Cu2+ with two 6-membered macrocyclic ethylsiloxanolate ligands, was established by means of X-ray study. The ligands have an all-cis configuration and a crown conformation. Four Cu2+ and two K+ ions form a planar hexagon sandwiched between antiparallel coaxial macrocyclic ligands. The K+ ions occupy two opposite apices of the hexagon. The Cu2+ ions have square-planar coordination with four siloxanolate OM atoms, while the K+ ions, are coordinated with two O atoms of the solvating butanol molecules, in addition to four OM atoms. The electric neutrality of the whole complex is due to the two outer-sphere K+ counter-ions, each located over one of the two siloxanolate macrocycles, i.e., over the «decks» of the sandwich and coordinated with endocyclic siloxane OSi atoms, as in crown-ether complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00704011
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structure of the La3+ sandwich complex based on 8-membered macrocyclic siloxanolate ligands (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 168-173 
    Details
    ISSN: 1573-9171
    Keywords: metal siloxanolates ; macrocyclic complexes ; organosilicon compounds ; complexes of rare-earth elements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The product of the reaction between anhydrous lanthanum trichloride and potassium vinylsiloxanolate, K5[VinSiO2]8La4(μ4-OH)[O2SiVin]8 · 5n-BuOH·2H2O has been studied by X-ray diffraction. The compound is a «sandwich»-type complex where macrocyclic vinyloctasiloxanolate ligands with regularcis-configuration have co-axial and antiparallel orientation. These ligands coordinate a planar «cationic layer» formed by four La3+ ions and stabilized by an additional μ4-OH− bridge ligand. A three-dimensional cage structure of complex lanthansiloxanolate pentaanions linked through the coordinated K+ counter-ions is formed in the crystal studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00700002
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal structure of the Nd, Gd, and Dy sandwich complexes involving 8-membered macrocyclic phenylsiloxanolate ligands (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 176-181 
    Details
    ISSN: 1573-9171
    Keywords: metal siloxanolates ; macrocyclic complexes ; organosilicon compounds ; rare-earth element complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An X-ray structural investigation of the interaction products of anhydrous trivalent neodymium, gadolynium, and dysprosium chlorides with sodium phenylsiloxanolate was carried out. The synthesized compounds with the general formula Na6[PhSiO2]8M4(μ4-O)[O2SiPh]8 · 10EtOH · 8H2O (M = Nd, Gd, Dy) were found to be isomorphous isostructural sandwich complexes. The macrocyclic octaphenyloctasiloxanolate ligands in the complexes have anall-cis-configuration and are arranged in co-axial antiparallel pairs and coordinate the square planar groups of the four Nd3+, Gd3+, or Dy3+ ions stabilized by an additional central μ4-bridging O2− ligand. Six Na+ counterions form the outer coordination sphere of the complexes such that four of them coordinate the siloxane macrocycle O atoms in pairs in analogy with crown-ether complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00700004
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and crystal structure of 1,3,5-tris [4-(phenylethynyl)phenyl]benzene (1994)
    Springer
    Russian chemical bulletin 43 (1994), S. 1873-1879 
    Details
    ISSN: 1573-9171
    Keywords: 1,3,5-triphenylbenzene derivatives ; diphenylacetylene derivatives ; polyphenylenes ; simulated polymer structures ; topochemical reactions in crystals ; crystal solvates ; clathrates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystal structure of 1,3,5-tris[4-(phenylethynyl)phenyl]benzene (1) has been investigated. Compound1 represents a model of the repeating unit of the most typical polyphenylene, which contains 1,3,5-trisubstituted benzene rings (chain centers) and acetylenic groups (complex-forming and cross-linking centers) in the main chain. The acetylene groups of neighboring molecules have a tendency to close mutual arrangement, which is favorable for their topochemical interaction. However, the relative conformational rigidity of molecules1 restricts not only the possibility of the optimal adjustment of the reactive sites of neighboring molecules to one another, but also hampers the close packing of molecules in the crystal, which contains channels filled by the solvent molecules (chloroform).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696320
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    Paper (German National Licenses)
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