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  • 1
    ISSN: 0022-328X
    Keywords: Cyclopentadienyl ; Structure ; Titanium ; π-aromatic ligands
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of oxygenated cobalt (II) complexes. X. 1,4,7,10-tetraazadecanecobalt (II) and 4,7-dimethyl-1,4,7,10-tetraazadecanecobalt (II) as dioxygen carriersIX: siehe [1].Oxygenation of cobalt (II) chelates with fourdentate amines such as 1,4,7,10-tetraazadecane (= tad) in aqueous solution yields μ-peroxo-μ-hydroxo-dicobalt (III) complexes. Due to facultative ligand disposition of the amine, 8 different diastereoisomers are possible. Introducing methyl groups in positions 4 and 7 of tad destabilizes the isomers with β-configuration. A crystallized perchlorate, obtained by oxygenation of 4, 7-dimethyl-1,4,7,10-tetraazadecanecobalt (II) (= dmtad) in alcaline solution, proved to be of the expected μ-peroxo-μ-hydroxo type. The ligand configuration is and lattice constants a (ΔΔ/ΛΛ). The X-ray structure was solved by Patterson's method and refined to R = 0.093. The crystals are orthorhombic with space group Pna21 and lattice constants a = 14.632 (4), b = 17.525 (5), c = 12.888 (5) Å. In its UV./VIS. absorption spectrum and its solution reactivity the binuclear cation is closely related to oxygenation products obtained with the chelate of unsubstituted tad. The kinetic parameters of the decomposition reaction of the μ-peroxo complexes in acidic solution are compared. The binuclear cations with 4, 7-dimethyl-1,4,7,10-tetraazadecane as ligand are generally more reactive. In slightly alcaline solution isomerization of the μ-peroxo-μ-hydroxo complexes has been observed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 81 (1969), S. 783-784 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Halosilane Adducts. XVII. Preparation, Crystal and Molecular Structure of (2, 2′ -Bipyridine) - trichloro - (trichlorosiloxy) -silicon, Cl3SiOSiCl3. bipy1 is obtained by the reaction of Cl3SiOSiCl3 and bipy. It crystallizes orthorhombic in the space group Pca21 (Z = 4). 1 contains a tetracoordinated and a hexacoordinated Si atom. The plain defined by coordinated bipy also contains the SiOSi group. The SiOSi bonding angle (152.8°) is larger than that of Cl3SiOSiCl3 (146°). The SiCl bonds are about 8% longer than the tetrahedral SiCl bonds. The two SiO bond lengths are different (1.684; 1.554 Å). The SiN distances (average 1.967 Å) as well as the other bond distances correspond to values found for related compounds. Configuration, SiOSi bond angle and other structural features are due to steric requirements. 1 represents the structure of least steric hindrance. The same structure is found in solution (1H-NMR). The results confirm that sterically more demanding ligands preferentially occupy the positions vertical to the plain of bipy (phen) in octahedral bip(phen) complexes of Si, hereby minimizing steric repulsions among each other(trans positions) and by CH groups of bipy(phen) exerted on ligands in he plain of bipy(phen).
    Notes: Cl3SiOSiCl3 · bipy 1 wird durch Reaktion von Cl3SiOSiCl3 und bipy erhalten. Die Verbindung kristallisiert orthorhombisch in der Raumgruppe Pca21 (Z = 4). In 1 liegt ein tetraedrisches und ein durch Koordination von bipy hexakoordiniertes Si-Atom vor. Die SiOSi-Gruppe und das koordinierte bipy liegen in einer Ebene. Der SiOSi-Bindungswinkel (152,8°) ist gegenüber freiem Cl3SiOSiCl3 (146°) aufgeweitet. Die SiCl-Abstände am hexakoordinierten Si sind um 8% länger als die tetraedrischen SiCl-Bindungen. Ebenso sind die beiden SiO-Bindungen unterschiedlich lang (1,684, 1,554 Å). Die SiN-Abstände (Mittel 1,967Å) entsprechen ebenso wie die anderen Bindungslängen Werten, die bei ähnlichen Verbindungen gefunden wurden. Konfiguration, Aufweitung des SiOSi- Winkels und andere strukturelle Befunde erweisen sich als sterisch bedingt. Es liegt die Anordnung geringster sterischer Hinderung vor. Die gleiche Struktur wird in Lösung gefunden (1H-NMR). Die Ergebnisse bestätigen, daß in oktaedrischen bipy(phen)-Komplexen des Siliciums sterisch anspruchsvollere Liganden die senkrecht zur bipy(phen)-Ebene liegenden Positionen bevorzugen, in denen sie den größten Abstand voneinander haben und in denen nicht die starken Wechselwirkungen mit den CH-Gruppen von bipy(phen) auftreten, denen die beiden Liganden in der bipy(phen)-Ebene ausgesetzt sind.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 8 (1969), S. 769-770 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 77 (1965), S. 740-740 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 343 (1966), S. 274-285 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: [Ni(HN2S2)2] reacts with phenyl isocyanate, C6H5NCO, forming the very stable complex [NiC7H7ON5S4] in which, according to x-ray structure analysis, the organic group is substituted for one H atom of [Ni(HN2S2)2]. The two S2N2 groups, contrary to those of the dimethyl derivative, were found to be in cis-position.
    Notes: [Ni(HN2S2)2] reagiert mit C6H5NCO, Phenylisocyanat, unter Bildung einer sehr beständigen Verbindung der Zusammensetzung [NiC7H7ON5S4]. Die Struktur dieses Komplexes wurde röntgenographisch bestimmt: Ein Wasserstoffatom im [Ni(HN2S2)2] ist durch den organischen Rest substituiert. Die beiden S2N2-Chelatgruppen stehen im Gegensatz zum früher untersuchten Dimethylderivat in cis-Stellung.
    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 348 (1966), S. 238-245 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Starting from [Ni(HN2S2)2], by interaction with aldehydes (form- and acetaldehyde, glyoxal) several new R-for-H derivatives of this complex have been prepared. With form aldehyde [Ni(CH4ON4S4)] is formed in acetone, [Ni(C2H4ON4S4)] in methanol; in the presence of amines other products were obtained, e.g. [Ni(C3H7N5S4)] from formaldehyde and methyl amine. Further derivates which were prepared and characterised are formulated in „Inhaltsübersicht“.
    Notes: Von der Komplexverbindung [Ni(HN2S2)2] konnte durch Umsetzung mit Aldehyden eine Reihe neuer Derivate hergestellt werden. Mit Formaldehyd entsteht in acetonischer Lösung [Ni(CH4ON4S4)], in methanolischer Lösung [Ni(C2H4ON4S4)]. Bei Gegenwart von Aminen bilden sich aus [Ni(HN2S2)2] und Formaldehyd andere Produkte: Mit Methylamin [Ni(C3H7N5S4)], mit Äthylamin [Ni(C4H9N5S4)] und mit Benzylamin [Ni(C9H11N5S4)]. Acetaldehyd gibt bei Anwesenheit von Ammoniak [Ni(C4H9N5S4)]. Glyoxal setzt sich leicht mit [Ni(HN2S2)2] und [Co(HN2S2)2] um unter Bildung der Komplexe [Ni(C2H4O2N4S4)] und [Co(C2H4O2N4S4)]. Daneben entstehen bei diesen Umsetzungen noch andere Komplexe, die nicht näher untersucht sind.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 420 (1976), S. 51-54 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal and Molecular Structure of N,N′-Bis(trimethylsilyl) Oximidic Acid Bis (trimethylsilyl) EsterThe X-ray structure analysis of the reaction product of oxalyl chloride with sodium bis(trimethylsilyl) amide formulated by PUMP and ROCHOW as N,N′-bis(trimethylsilyl) oximidic Acid bis (trimethylsilyl) ester shows that the suggested structure is correct for the solid state. The compound crystallizes in the space group P1 with a = 9.948(4), b = 6.612(3), c = 10.370(4) Å, α = 88.87(6), β = 116.95(4), γ = 98.23(6)°, and Z = 1. The molecule manifests symmetry 1.
    Notes: Die Röntgenstrukturanalyse des von PUMP und ROCHOW als N,N′-Bis(trimethylsilyl)-oximidsäure-bis(trimethylsilyl)-ester formulierten Reaktionsprodukts von Oxalylchlorid mit Natrium-bis(trimethylsilyl)-amid zeigt, daß diese Formulierung für den festen Zustand zutrifft. Die Verbindung kristallisiert in der Raumgruppe P1 mit a = 9,948(4), b = 6,612(3), c = 10,370(4) Å, α = 88,87(6), β = 116,95(4), γ = 98,23(6)° und Z = 1. Die Molekel besitzt die Eigensymmetrie 1.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 462 (1980), S. 221-225 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: S4N4 and its Derivatives: Preparation and X-Ray Structure Analysis of CuCl2 · S4N4S4N4 reacts with CuCl2 · 2 H2O in organic solvents to form the polymeric copper(II) complex CuCl2 · S4N4. This complex crystallizes in space group Pnma with a = 18.832(7), b = 6.586 (2), c = 6.683(3) Å and Z = 4. An X-ray analysis (R = 0.054) shows the crystal to contain parallel chains in which the Cu atoms are bridged by Cl and S4N4 bridges and possess a distorted octahedral coordination with four equatorial Cl atoms and two axial N atoms. The S4N4 ring is connected to the Cu atoms by two neighbouring N atoms. In its conformation and dimensions the S4N4 group in CuCl2 S4N4 agrees well with the uncomplexed S4N4 molecule.
    Notes: Bei der Umsetzung von S4N4 mit CuCl2 · 2H2O in organischen Lösungs-mitteln entsteht der polymer gebaute Kupfer(II)-Komplex CuCl2 · S4N4. Er kristallisiert in der Raumgruppe Pnma mit a = 18,832(7). b = 6,586(2), c = 6,683(3) Å und Z = 4. Eine Röntgenstrukturanalyse (R = 0,054) ergibt, daß im Kristall parallele Ketten vorliegen, wobei die verzerrt-oktaedrisch koordinierten Kupferatome durch je zwei Cl-Atome und eine S4N4-Gruppe verbrückt sind. Die S4N4-Gruppe ist über zwei benachbarte N-Atome an die Cu-Zentren gebunden. In ihren Abmessungen und in ihrer Konformation unterscheidet sie sich kaum von freiem S4N4.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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