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  • Inorganic Chemistry  (13)
  • Nuclear reactions  (5)
  • 1
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 412 (1984), S. 159-188 
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 359 (1981), S. 442-454 
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 457 (1986), S. 375-400 
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 430 (1984), S. 234-248 
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
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  • 6
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Proton Resonance Spectroscopy of Unsaturated Ringsystems, XXIX. Simple Synthesis of Benzocyclooctene by Protonation of Biphenylene DianionBiphenylene dianion (1) reacts with H2O to give 4a,8b-dihydrobiphenylene (3) that opens thermally to give benzocyclooctene (4) (yield 〉 80%). At 0°C 3 has a half life of 1 min. The activation parameters of the rearrangement 3 → 4 are δH* = 78.8 ± 5.0 kJ/mol and δS* = - 7.3 ± 8.7 j/mol K. 3 reacts with maleic anhydride to give a Diels-Alder adduct, whose structure has been determined by X-ray analysis.
    Notes: Biphenylen-Dianion (1) reagiert mit H2O zu 4a,8b-Dihydrobiphenylen (3). das thermisch zu Benzocylcoocten (4) öffnet (Ausb. 〉 80%). Bei 0°C besitzt 3 eine Halbwertszeit von 1 min. Die Aktivierungsparameter der Umlagerung 3 → 4 betragen δH* = 78.8 ± 5.0 kJ/mol und δS* = - 7.3 ± 8.7 J/mol K. 3 liefert mit Maleinsäureanhydrid ein Diels-Alder-Addukt, dessen Struktur röntgenographisch bestimmt wurde.
    Additional Material: 2 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2547-2554 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of 3-(Lithiomethyl)-1,1,2,2-tetramethylcyclopropane, a Stable Cyclopropylmethyllithium CompoundThe cyclic chlorine and mercury compounds 6 and 9 as well as the open-chain chloro compound 7 react with lithium power in diethyl ether to afford the pure cyclopropylmethyllithium compound 10 completely free of diethyl ether. Only at - 60°C starting with 7 besides 10.8% of the corresponding open-chain organolithium compound 11 was detected. X-ray analysis of 10 showed solvent-free hexameric clusters with the lithium atoms forming a trigonal antiprism with unoccupied trianglular faces on the top and at the bottom while each of the six laterally triangular faces is coordinated to a 2,2,3,3-tetramethylcyclopropylmethyl ligand.
    Notes: Sowohl die cyclischen Chlor- und Quecksilberverbindungen 6 und 9 als auch die offenkettige Chlorverbindung 7 liefern bei der Umsetzung mit Lithiumpulver in Diethylether die reine etherfreie Cyclopropylmethyllithium-Verbindung 10. Nur bei - 60°C lassen sich ausgehend von 7 noch 8% der entsprechenden offenkettigen Lithiumverbindung 11 neben 10 nachweisen. Die Röntgenstrukturanalyse von 10 ergab hexamere Cluster, in denen die Lithiumatome ein trigonales Antiprisma bilden, dessen obere und untere Dreiecksfläche unbesetzt ist, während über jeder der sechs seitlichen Dreiecksflächen ein 2,2,3,3-Tetramethylcyclopropylmethyl-Rest koordiniert ist.
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  • 8
    ISSN: 0044-2313
    Keywords: Phosphorus sulfides ; 31P NMR spectroscopy ; phosphorus sulfur melts ; tetra phosphorus hexasulfide ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Molecular Composition of Solidified Phosphorus-Sulfur Melts and the Crystal Structure of β-P4S6Phosphorus sulfur melts were annealed for one week at 673 K and then quenched in ice water. The solids were dissolved in CS2 and the concentrations of phosphorus sulfides were determined by 31P NMR spectroscopy. Samples containing between 44 and 70 mol% sulfur dissolved completely in CS2. Between 0 and 42 mol% remains an insoluble residue of red phosphorus. Above 72 mol% it consisted of sulfur chains linked by phosphorus atoms. The solutions contained mainly the congruently melting compounds P4S3, P4S7, and P4S10 having maximum concentrations at their stoichiometric compositions. Other compounds P4Sn (n = 4-9) which decompose on heating, according to the phase diagram, were also found in surprisingly high concentrations. One of these was β-P4S6 which crystallizes in the monoclinic space group P21/c with the lattice parameters a = 702.4(2), b = 1 205.6(2), c = 1 148.9(6) pm and β = 103.4(2)°.Reaction of white phosphorus with sulfur was also investigated. In contrast to the results of previous authors, who described the system P4-S8 below 373 K as eutectic, we found that the elements reacted below this temperature.
    Notes: Phosphor-Schwefel-Schmelzen wurden eine Woche bei 673 K getempert und anschließend in Eiswasser abgeschreckt, dann in CS2 gelöst und die Konzentration der Phosphorsulfide mit Hilfe der 31P-NMR-Spektroskopie bestimmt. Proben mit Zusammensetzungen zwischen 44 und 70 Mol-% Schwefel lösten sich vollständig auf. Zwischen 0 und 42 Mol-% Schwefel traten als unlöslicher Rückstand roter Phosphor, oberhalb von 72 Mol-% Schwefel über Phosphoratome vernetzte Schwefelketten auf. Die löslichen Bestandteile waren hauptsächlich die kongruent schmelzenden Verbindungen P4S3, P4S7 und P4S10. Die maximalen Konzentrationen lagen bei den jeweiligen stöchiometrischen Zusammensetzungen. Andere P4Sn (n = 4-9) Verbindungen, deren Molekülkristalle sich beim Erwärmen peritektisch oder peritektoid zersetzen, wurden ebenfalls mit höheren Konzentrationen gefunden, dazu gehörte β-P4S6, das in der monoklinen Raumgruppe P21/c mit den Gitterkonstanten a = 702,4(2), b = 1 205,6(2), c = 1 148,9(6) pm und β = 103,4(2)° kristallisiert.Die Reaktion von weißem Phosphor mit Schwefel wurde ebenfalls untersucht. Im Gegensatz zu Angaben anderer Autoren, die das P4-S8-System unterhalb von 373 K als einfach eutektisch beschreiben, wurden in diesem Temperaturbereich Reaktionen zwischen den Komponenten beobachtet.
    Additional Material: 5 Ill.
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  • 9
    ISSN: 0044-2313
    Keywords: Selenites ; hydrates ; X-ray ; IR ; crystal structure ; pseudosymmetry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polymorphic and Pseudosymmetrical Hydrates MSeO3 · H2O (M = Mn, Co, Ni, Zn, Cd)By crystallization from aqueous solutions of MSeO3 and M(HSeO3)2, the selenites MSeO3 · H2O (M = Mn, Co, Ni, Zn, Cd) were obtained and characterized by means of X-ray diffraction and IR-spectroscopy. The crystal structure of ZnSeO3 · H2O was determined. The IR spectra indicate that the hydrates are isotypic and contain H2O molecules of symmetry mm2. However, the X-ray data show different structure types with H2O molecules of site symmetry m or 1. CdSeO3 · H2O and MnSeO3 · H2O are isotypic (o.rh., MnSeO3 · D2O type). CoSeO3 · H2O (mon.) as well as the isotypic NiSeO3 · H2O and ZnSeO3 · H2O (mon.) form new structure types. These findings are discussed on the basis of the crystal structure of ZnSeO3 · H2O (P21/n, a = 477.9(1), b = 1319.4(5), c = 570.1(1) pm, β = 90.84(2)°, Z = 4, Dx = 3.886 g · cm-3, R = 0.035 for 722 reflections with I 〉 2σ1) and the local pseudosymmetry of its components, i.e., layers ∞2[ZnSeO3 · H2O] of ZnO6 octahedra sharing four equatorial vertices, SeO32- anions and H2O molecules.
    Notes: Durch Kristallisation aus MSeO3- und M(HSeO3)2-Lösungen wurden die Selenite MSeO3 · H2O (M = Mn, Co, Ni, Zn, Cd) erhalten und röntgenographisch sowie IR-spektroskopisch charakterisiert. Von ZnSeO3 · H2O wurde die Kristallstruktur bestimmt. Die IR-Spektren deuten auf Isotypie der Hydrate und H2O-Moleküle der Symmetrie mm2. Die Röntgenbeugungsdaten zeigen dagegen das Vorliegen verschiedener Strukturtypen mit H2O-Molekülen der Lagesymmetrie m oder 1. CdSeO3 · H2O und MnSeO3 · H2O sind isotyp (o.rh., MnSeO3 · D2O-Typ). CoSeO3 · H2O (mon.) sowie die isotypen NiSeO3 · H2O und ZnSeO3 · H2O (mon.) kristallisieren in neuen Strukturtypen. Diese Befunde werden auf der Basis der Kristallstruktur von ZnSeO3 · H2O (P21/n, a = 477,9(1), b = 1319,4(5), c = 570,1(1) pm, β = 90,84(2)°, Z = 4, Dx = 3,886 g · cm-3, R = 0,035 für 722 Reflexe mit I 〉 2σ1) und der lokalen Pseudosymmetrie ihrer Bausteine (Schichten ∞2[ZnSeO3 · H2O] aus vierfach eckenverknüpften ZnO6-Oktaedern, SeO32--Anionen und H2O-Moleküle) diskutiert.
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  • 10
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NaM2OH(SO3)2 · 1 H2O with M = Mg, Mn, Fe, Co, Ni, and Zn. A New Class of Basic SulfitesHitherto unknown hydroxide sulfites of the type NaM2OH(SO3)2 · 1 H2O with M = Mg, Mn, Fe, Co, Ni, and Zn have been obtained by crystallization from aqueous sulfite solutions containing Na+ and M2+ ions. Crystal structure, IR and Raman data, and the results of thermoanalytical studies are reported and discussed. The hydroxide sulfites show a strongly anisotropic thermal expansion due to the layer structure and exhibit an unusually high thermal stability compared to other solid hydrates. The magnesium compound, for example, decomposes at 355°C. The crystal data of the triclinic compounds see “Inhaltsübersicht”.
    Notes: Durch Kristallisation aus natriumhaltigen wässerigen Sulfitlösungen wurden bisher nicht bekannte Hydroxidsulfite des Typs NaM2OH(SO3)2 · 1 H2O mit M = Mg, Mn, Fe, Co, Ni und Zn erhalten. Die Kristallstruktur, die IR- und Ramanspektren sowie das Ergebnis thermoanalytischer Untersuchungen werden mitgeteilt und diskutiert. Die Verbindungen zeigen aufgrund ihrer Schichtenstruktur eine stark anisotrope thermische Ausdehnung. Sie besitzen eine für Hydrate ungewöhnlich große thermische Stabilität. Die Magnesiumverbindung zersetzt sich z. B. erst oberhalb von 355°C. Die Verbindungen des Typs NaM2OH(SO3)2 · 1 H2O kristallisieren triklin (P1, Z = 2) mit folgenden Gitterdaten: M = Mg: a = 890,5(1), b = 784,5(1), c = 631,5(1) pm, α = 113,28(2)°, β = 110,41(1)°, γ = 98,00(2)°, M = Mn: a = 907,6(1), b = 795,7(1), c = 648,7(1) pm, α = 112,71(1)°, β = 109,34(1)°, γ = 99,23(1)°, M = Fe: a = 898,8(1), b = 789,0(1), c = 634,8(1) pm, α = 112,06(1)°, β = 109,59(1)°, γ = 99,76(1)°, M = Co: a = 888,0(1), b = 783,7(1), c = 631,6(1) pm, α = 112,61(1)°, β = 109,85(1)°, γ = 98,93(1)°, M = Ni: a = 878,4(2), b = 777,0(3), c = 626,3(1) pm, α = 112,54(2)°, β = 109,84(2)°, γ = 99,47(3)°, M = Zn: a = 887,4(1), b = 785,2(1), c = 629,9(1) pm, α = 112,27(1)°, β = 109,67(1)° und γ = 99,66(1)°.
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