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  • 1
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 42 (1986), S. 1027-1029 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 42 (1986), S. 1570-1573 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 45 (1989), S. 314-317 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 4
    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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  • 5
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: An N/P-Analogue of Cyclotetraphosphazene: Reactions and Structure of Octaphenyl-1,5,2λ5,3, 4λ5,6λ5,7,8λ5-diazahexaphosphocin and its PdCl2-ComplexThe eight-membered heterocycle 6 indicated in the title is analogous to the octaphenyl cyclotetraphosphazene in which two antipodal nitrogen ring members have been replaced by two-coordinate phosphorus. It can be obtained from (Ph2P)2NLi and P4. Very strong nucleophiles attack the PP-bonds and eventually degrade the ring in a way reverting the synthesis. 6 is selectively methylated at the two-coordinate phosphorus and forms cis-chelates with PdCl2 and PtCl2 by coordinating both of these phosphorus members.The structur of 6 and its PdC12-complex 8 were investigated by X-ray analysis and allowes multiple comparisons. All in all 6 certainly resembles a cyclophosphazene, its two-coordinate phosphorus displays phosphide character however. This is also confirmed by an MNDO calculation.
    Notes: Die im Titel genannte Achtringverbindung 6 stellt ein Analogon zum Octaphenyl-cyclotetraphosphazen dar, in dem zwei gegenüberliegende Stickstoff-Ringglieder durch zweifach-koordinierten Phosphor ersetzt sind. Sie ist aus (Ph2P)2NLi und P4 zugänglich und wird von sehr starken Nucleophilen an den PP-Bindungen angegriffen und im Sinne einer Syntheseumkehr abgebaut. Sie wird selektiv am zweifach-koordinierten Phosphor methyliert und bildet mit PdCl2 und PtCl2 durch Koordination dieser Phosphorglieder cis-Chelate.Die Strukturen von 6 und des PdC12-Komplexes 8 wurden röntgenographisch bestimmt und ermöglichen eingehende Strukturvergleiche. Insgesamt ergibt sich bei aller Cyclophosphazen-Ähnlichkeit ein phosphidischer Charakter des zweifach-koordinierten Phosphors in 6. Eine MNDO-Berechnung bestätigt das ebenfalls.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 535 (1986), S. 179-185 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Alkali Selenoarsenates(III) KAsSe3 · H2O, RbAsSe3 · 1/2 H2O, and CsAsSe3 · 1/2 H2OThe alkali selenoarsenates(III) KAsSe3 · H2O, RbAsSe3 · 1/2 H2O, and CsAsSe3 · 1/2 H2O have been prepared by hydrothermal reaction of the respective alkali carbonate with As2Se3 at a temperature of 135°C. Their X-ray structural analyses demonstrated that the compounds contain polyselenoarsenate(III) anions (AsSe3-)n, in wich the basic units are ψ-AsSe3 tetrahedra, which are linked together through Se—Se bonds into infinite zweier single chains. The Rb and Cs salts are isotypic.
    Notes: Die Alkaliselenoarsenate(III) KAsSe3 · H2O, RbAsSe3 · 1/2 H2O und CsAsSe3 · 1/2 H2O wurden durch hydrothermale Reaktion des jeweiligen Alkalicarbonats mit As2Se3 bei einer Temperatur von 135°C dargestellt. Ihre Röntgenstrukturanalysen ergaben, daß die Verbindungen Polyselenoarsenat(III)-Anionen (AsSe3-)n beinhalten, in denen die Grundelemente ψ-AsSe3-Tetraeder sind, die miteinander über Se—Se-Bindungen zu unendlichen Zweier-Einfachketten verknüpft sind. Die Rb- und Cs-Salze sind isotyp.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 554 (1987), S. 137-145 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Concerning Polymetaarsenites. Preparation and Crystal Structure of BaAs2O4. H2OBaAs2O4·H2O was prepared by hydrothermal reaction of BaO with As2O3 at a temperatur of 200°C. An X-ray structural analysis demonstrated that the phase contains polymetaarsenite anions [As4O84-]n, which adopt vierer single chains in the lattice. The relationship between the conformation of metaarsenite chains and cation size is discussed.
    Notes: BaAs2O4·H2O wurde durch hydrothermale Reaktion von BaO mit As2O3 bei einer Temperatur von 200°C dargestellt. Eine Röntgenstruktranalyse ergab, daß die Phase Polymetaarsenitanionen [As4O84-]n beinhaltet, die im Kristallgitter als Vierer-Einfachketten vorliegen. Die Beziehung zwischen Konformation von Polymetaarsenitketten und Kationgröße wird erlätert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 527 (1985), S. 17-32 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyanophosphorus Compounds. IX. Breakdown of White Phosphorus by Cyanide Yielding Dicyanophosphides and Dicyanophosphide StructureWhite phosphorus is degraded by strong enough anionic nucleophiles X- with more or less disproportionation. With crown ether alkali, ammonium or phosphonium cyanides, X- = CN-, selectively the corresponding dicyanophosphide, P(CN)2-, is formed and a polyphosphide, preferentially P15-.[18] Crown-6-KP(CN)2 is also obtained from the reaction of P(CN)3, KF, and crown ether. In the crystal of this salt the dicyanophosphide anions (bent at phosphorus by an angle of 95°) coordinate with both nitrogen ends towards (different) cations. The PC distance (168 pm on the average) is as short as in phosphaalkenes. δ13C and JPC of P(CN)2- fit well into a correlation with the charge density at phosphorus generally valid for cyanophosphorus compounds.
    Notes: Genügend starke anionische Nucleophile X- bauen weißen Phosphor unter mehr oder weniger weitgehender Disproportionierung ab. Mit Kronenether-Alkali-, Ammonium- oder Phosphoniumcyaniden, X- = CN-, entsteht dabei selektiv das entsprechende Dicyanphosphid, P(CN)2-, und ein Polyphosphid, bevorzugt P15-.[18] Krone-6-KP(CN)2 entsteht auch bei der Umsetzung von P(CN)3 mit KF und Kronenether. Im Kristall dieses Salzes sind die am Phosphor (um 95°) gewinkelten Dicyanphosphid-Anionen mit beiden Stickstoffenden an je ein Kation koordiniert. Der PC-Abstand ist (mit durch-schnittlich 168 pm) so kurz wie in Phosphaalkenen. δ13C und JPC von P(CN)2- ordnen sich gut in einen für Cyanphosphorverbindungen allgemein geltenden Zusammenhang mit der Ladungsdichte am Phosphor ein.
    Additional Material: 2 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 536 (1986), S. 114-118 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of CsSb2Se4CsSb2Se4 was prepared by hydrothermal reaction of Cs2CO3 with Sb2Se3 at a temperature of 115°C. An X-ray structural analysis demonstrated that the compound contains polyselenoantimonate(III) anions (Sb2Se4-)n, which display both (Sb)Se—Sb and (Sb)Se—Se(Sb) bridges. A ψ-tetrahedral coordination is observed for one of the independent Sb atoms, a ψ-trigonal bipyramidal coordination for the other. The Sb—Se polyhedra are linked through joint corners and edges and in addition via direct Se—Se bonds into sheets.
    Notes: CsSb2Se4 wurde durch hydrothermale Reaktion von Cs2CO3 mit Sb2Se3 bei einer Temperatur von 115°C dargestellt. Eine Röntgenstrukturanalyse ergab, daß die Verbindung Polyselenoantimonat(III)-Anionen (Sb2Se4 -)n beinhaltet, die sowohl (Sb)Se—Sb- als auch (Sb)Se—Se(Sb)-Brücken aufweisen. Für eines der beiden unabhängigen Sb-Atome wird eine ψ-tetraedrische Koordination, für das andere eine ψ-trigonalbipyramidale Koordination gefunden. Die Sb—Se-Polyeder sind über gemeinsame Ecken und Kanten sowie über direkte Se—Se-Bindungen zu Schichten vernetzt.
    Additional Material: 1 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 538 (1986), S. 45-52 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Concerning Ba2As6O11Ba2As6O11 was prepared by hydrothermal reaction of BaO with As2O3 at a temperature of 200°C. An X-ray structural analysis demonstrated that the phase contains highly condensed polyarsenate(III) anions (As6O114-)n. A zweier double chain structure was observed for the anion, in which the individual chains are bridged to one another by two Ψ-AsO3 tetrahedra, so that As10O10 rings are formed. The double chains are linked into “double sheets”, perpendicular to the b-axis, through relatively strong secondary O … As bonds with an average length of 2.68 Å.
    Notes: Ba2As6O11 wurde durch hydrothermale Reaktion von BaO mit As2O3 bei einer Temperatur von 200°C dargestellt. Eine Röntgenstrukturanalyse ergab, daß die Phase hochkondensierte Polyarsenat(III)-Anionen (As6O114-)n beinhaltet. Für das Anion werden Zweier-Doppelketten beobachtet, wobei die einzelnen Stränge über zwei Ψ-AsO3-Tetraeder miteinander verbrückt sind, so daß As10O10-Ringe entstehen. Durch relativ starke sekundäre O … As-Bindungen mit einer Durchschnittslänge von 2,68 Å werden die Doppelketten zu „Doppelschichten“ senkrecht zur b-Achse verknüpft.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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