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  • Inorganic Chemistry  (23)
  • Cyclopentene  (2)
  • 1
    ISSN: 0022-328X
    Keywords: Cyclohexane ; Cyclopentane ; Cyclopentene ; Gallium ; Indium ; Zirconium
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0022-328X
    Keywords: Cyclohexane ; Cyclopentane ; Cyclopentene ; Gallium ; Indium ; Zirconium
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organometallic Compounds of the Lanthanides. LIII. (C5H5Gd)5(μ2-OCH3)4(μ3-OCH3)4 (μ5-O) and [Na2(tC4H9OGd)4(μ3-OtC4H9)8(μ6-O)], two New Alkoxi Gadolinium Clusters with Interstitial OxygenGadolinium trichloride reacts in tetrahydrofurane with cyclopentadienyl sodium and two equivalents of sodium methoxide with formation of (C5H5Gd)5(μ2-OCH3)4(μ3-OCH3)4(μ5-O) (1), and with potassium tert-butoxide with formation of [Na2(tC4H9OGd)4(μ3-OtC4H9)8(μ6-O)] (2). The X-ray structure of 1 shows a tetragonal pyramide build up by five gadolinium atoms, containing an oxygen atom in the center of the base and eight bridging methoxo groups. The structure of 2 consists of an oxygen centered octahedron build up by two sodium and four gadolinium atoms, connected by eight bridging tert-butoxy groups and four terminal butoxides. The monoclinic crystals of 1, space group I2/a have the following crystallographic data: a = 2 276.9(5) pm, b = 2 063.1(6) pm, c = 3 152.2(3) pm, β = 90.7(1)°, Z = 12, Dcalcd 1.85 g · cm-3, R = 0.0519. 2 crystallizes tetragonal, space group I4/mmm with a = 1 728.5(4) pm, b = 1 031.0(3) pm, Z = 2, Dcalcd 1.69 g · cm-3, R = 0.0682.
    Notes: Gadoliniumtrichlorid bildet in Tetrahydrofuran mit Cyclopentadienylnatrium und zwei Äquivalenten Natriummethanolat (C5H5Gd)5(μ2-OCH3)4(μ3-OCH3)4(μ5-O) (1), mit Kalium-tert-butanolat kann dagegen [Na2(tC4H9OGd)4(μ3-OtC4H9)8(μ6-O)] (2) isoliert werden. Die Röntgenstrukturanalyse von 1 zeigt eine tetragonale Pyramide aus 5 Gadoliniumatomen mit einem Sauerstoffatom im Zentrum der Basisfläche sowie acht verbrückenden Methanolatgruppen, die von 2 einen aus zwei Natrium- und vier Gadoliniumatomen gebildeten, Sauerstoff-zentrierten Oktaeder mit vier endständigen und acht verbrückenden tert-Butanolat-Einheiten. Die monoklinen Kristalle von 1, Raumgruppe I2/a haben folgende Gitterkonstanten: a = 2 276,9(5) pm, b = 2 063,1(6) pm, c = 3 152,2(3) pm, β = 90,7(1)°, Z = 12, Dber. 1,85 g/cm3, R = 0,0519. 2 kristallisiert tetragonal, Raumgruppe I4/mmm mit a = 1 728,5(4) pm, c = 1 031,0(3) pm, Z = 2, Dber. 1,69 g/cm3, R = 0,0682.
    Additional Material: 7 Ill.
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  • 4
    ISSN: 0044-2313
    Keywords: Tetramethyltitanium-1,2-bis(dimethylphosphino)-ethane ; NMR data ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Transition Metal Alkyl Compounds. 61. Preparation and Crystal Structure of Tetramethyltitanium-1,2-bis(dimethylphosphino)ethaneThe title complex 1 was synthesized by addition of 1,2-bis(dimethylphosphino)ethane to a solution of tetramethyltitanium in diethylether. The complex was characterized by 1H, 13C and 31P NMR spectra and by X-ray crystal structure analysis. 1 consists of two independent molecules with distorted octahedral structure.
    Notes: Der Titelkomplex 1 wurde durch Addition von 1,2-Bis(dimethylphosphino)ethan an Tetramethyltitan in Diethylether erhalten. Der Komplex wurde 1H-, 13C- und 31P-NMR-spektroskopisch, sowie durch Röntgenkristallstruktur-analyse charakterisiert. 1 tritt in der Elementarzelle in zwei unabhängigen Molekülen mit verzerrt oktaedrischer Konstitution auf.
    Additional Material: 3 Ill.
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  • 5
    ISSN: 0044-2313
    Keywords: γ-anti effect ; 1-phosphabicyclo 3.3.1 nonane derivatives ; pentacarbonylchromium complex ; structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: γ-Anti Effect in 1-Phosphabicyclo[3.3.1]nonane Derivatives with Substituents at Phosphorus. Synthesis and Structure of Pentacarbonyl(1-phosphabicyclo[3.3.1]nonane) ChromiumIn 1-phosphabicyclo[3.3.1]nonane derivatives of the composition C8H15P(X) the CC-conformation always dominates. Changes in the chemical shifts of the bridge-head carbon atom C(5) in the 13C-NMR spectrum are only originated by the electronic influence of the substituent X at the phosphorus centre. Based on a homogeneous interpretation of the electronic interactions and with regard to Pearsons's definition of electronegativity the electronegativities of substituents at the phosphorus atom X = Cr(CO)5, Fe(CO)4, and Ni(CO)3 are estimated. These groups are placed in antiperiplanar orientation to the carbon atom C(5).The molecular structure of (1-phosphabicyclo[3.3.1]-nonane) Cr(CO)5 3 was elucidated by X-ray diffraction analysis. The molecule features the 1-phosphabicyclononane ligand in the CC-conformation, which has a nearly undistorted Cr(CO)5 unit coordinated to the phosphorus atom (d Cr—P = 2.368(1) Å).
    Notes: Bei 1-Phosphabicyclo[3.3.1]nonan-Derivaten C8H15P(X) dominiert stets die CC-Konformation. Änderungen der chemischen Verschiebung des C(5)-Brückenkopfatoms im 13C-NMR-Spektrum werden alleine durch den elektronischen Einfluß des Substituenten X am Phosphoratom hervorgerufen. Auf der Grundlage einer einheitlichen Interpretation der elektronischen Wechselwirkungen und unter Anwendung des Elektronegativitätsbegriffs von Pearson konnte die Elektronegativität der in antiperiplanarer Position zu C(5) stehenden Phosphorsubstituenten X = Cr(CO)5, Fe(CO)4, Ni(CO)3 abgeschätzt werden.Die Molekülstruktur von (1-Phosphabicyclo[3.3.1]-nonan) Cr(CO)5 (3) wurde mittels Röntgenbeugung ermittelt. Das Molekül zeigt das Bild eines 1-Phosphabicyclo[3.3.1]nonans in der CC-Konformation, an dessen Phosphoratom eine nahezu unverzerrte Cr(CO)5 Einheit (d Cr—P = 2,368(1) Å) koordiniert ist.
    Additional Material: 4 Ill.
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  • 6
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organometalphosphine Substituted Transition Metal Complexes. XXIII. Pentacarbonyl(organometalphosphine)chromium, Molybdenum, and Tungsten ComplexesHexacarbonyl-chromium, -molybdenum and -tungsten react under u.v. irradiation with tri(tert-butyl)-phosphine, di(tert-butyl)trimethylsilyl-, -germyl- and -stannylphosphine, tert-butylbis(trimethylsilyl-, -germyl- and -stannyl)phosphine as well as with tris(trimethylsilyl-, -germyl- and -stannyl)phosphine with displacement of one CO ligand and formation of the corresponding pentacarbonyl-organometalphosphine chromium, molybdenum and tungsten complexes. The i.r., Raman, 1H n.m.r., and 31P n.m.r. spectra of the complexes are discussed.
    Notes: Hexacarbonyl-chrom, -molybdän und -wolfram reagieren bei UV-Bestrahlung mit Tri(tert-butyl)phosphin, Di(tert-butyl)trimethylsilyl-, -germyl- bzw. -stannylphosphin, tert-Butylbis(trimethylsilyl-, -germyl- bzw. -stannyl)phosphin sowie mit Tris(trimethylsilyl-, -germyl- bzw. -stannyl)phosphin unter Abspaltung eines CO-Liganden und Bildung entsprechender Pentacarbonyl-organometallphosphin-chrom(0)-, -molybdän(0)- und -wolfram(0)-Komplexe. Die Infrarot-, Raman-, 1H-NMR- und 31P-NMR-Spektren werden diskutiert.
    Additional Material: 1 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 305 (1960), S. 88-97 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The RAMAN-spectra of CH3SeO2H and C2H5SeO2H in different states (solid, in H2O, in CH3OH) and the IR-spectra in KBr are given and discussed. Strong H-bonds, which are strongest in CH3SeO2H, cause association in solid and in solved state. The molecule C2H5SeO2H forms in solution (in H2O, in CH3OH, in KBr) two rotational isomeric configurations. In contrast to the compounds H2SeO3 and RO · SeO · OH, methanol does no esterify CH3SeO2H and C2H5SeO2H. Some chemical, physical, and physiologic properties are given.
    Notes: Es werden die RAMAN-Spektren der Methan- und Äthanseleninsäure in verschiedenen Zuständen (fest, in H2O, in CH3OH) sowie die IR-Spektren in KBr mitgeteilt und diskutiert. Starke H-Brückenbindungskräfte, die in der Methanverbindung etwas stärker sind, bewirken sowohl im festen Zustand als auch in Lösung Assoziation. Die Äthanseleninsäure existiert in Lösung (in H2O, in CH3OH, in KBr) in zwei rotationsisomeren Strukturen. Keine der Säuren wird durch Methanol im Gegensatz zur selenigen Säure und den alkylselenigen Säuren verestert. Einige chemische, physikalische und physiologische Eigenschaften werden angegeben.
    Additional Material: 2 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 305 (1960), S. 98-107 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The RAMAN-spectra of the compounds CH3SeOOH · HCl and C2H5SeOOH · HCl in solid state and in aqueous solutions as well as the IR-spectra of these compounds suspended in nujol or pressed in KCl are given and discussed. It results a structure with the general formula [R-Se(OH)2] Cl with two SeO-single bonds. The ions are connected in the lattice by H-bonds. Low dissociation of the cation occurs in aqueous solution. The ion [C2H5Se(OH)2]⊕ exists in aqueous solution in two rotational isomeric configurations.
    Notes: Es werden die RAMAN-Spektren der Verbindungen CH3SeOOH · HCl und C2H5SeOOH · HCl im festen Zustand und in wäßriger Lösung sowie die IR-Spektren dieser Verbindungen suspendiert in Nujol und gepreßt in KCl mitgeteilt und diskutiert. Es ergibt sich eine Struktur der allgemeinen Formel [R-Se(OH)2]Cl mit 2 SeO-Einfachbindungen. Die Ionen sind im Gitter über H-Brücken miteinander verbunden. In wäßriger Lösung findet geringe Dissoziation des Kations zur freien Säure statt. Das [C2H5Se(OH)2]⊕-Ion liegt in wäßriger Lösung in zwei rotationsisomeren Konfigurationen vor.
    Additional Material: 3 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 375 (1970), S. 72-76 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The molecular spectra of (C6H5)3GeSC6H5 (I), (C6H5)3SnSC6H5 (II), (C6H5)2 · Sn(SC6H5)2 (III) and (C6H5)3PbSC6H5 (IV) are reported and the metal-sulfur vibrational frequencies assigned. The positions of these frequencies are compared with those of the vSn-O and vSn-Se in (C6H5)3SnOC6H5 (V) and (C6H5)3SnSeC6H5 (VI).The bonding nature is discussed in connection with other similar organometal sulfides.
    Notes: Die Molekülspektren von (C6H5)3GeSC6H5 (I), (C6H5)3SnSC6H5 (II), (C6H5)2Sn(SC6H5)2 (III) und (C6H5)3PbSC6H5 (IV) werden mitgeteilt und die Metall-Schwefel-Valenzschwingungen zugeordnet. Die Lage dieser Frequenzen wird mit der der vSn—O und vSn—Se in (C6H5)3SnOC6H5 (V) und (C6H5)3SnSeC6H5 (VI) verglichen. Im Zusammenhang mit früheren Untersuchungen an ähnlich gebauten Organometallsulfiden werden die Bindungsverhältnisse diskutiert.
    Additional Material: 1 Tab.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 393 (1972), S. 39-49 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: RAMAN and IR spectroscopic investigation of alkyl derivatives of arsenic acid. II. Vibrational spectra of some alkanearsonic acid dialkylestersRAMAN and IR spectra of CH3AsO(OCH3)2, CH3AsO(OC2H5)2, C2H5AsO(OCH3)2, and C2H5AsO(OC2H5)2, are communicated and discussed. Their skeleton CAsO(OC)2 has very probably Cs symmetry.
    Notes: Es warden die RAMAN-und IR-Spektren von CH3AsO(OCH3)2, CH3AsO(OC2H5)2, C2H5AsO(OCH3)2, und C2H5AsO(OC2H5)2, in Substanz mitgeteilt und diskutiert. Für das Gerüst CAsO(OC)2 ergibt sich mit sehr großer Wahrscheinlichkeit die Symmetrie Cs.
    Additional Material: 4 Ill.
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