WILBERT

Wildauer Bücher+E-Medien Recherche-Tool

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    London : IntechOpen
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource , Illustrationen, Diagramme
    ISBN: 9781789237238
    URL: Volltext  (Kostenfrei)
    URL: Volltext  (kostenfrei)
    URL: Volltext  (kostenfrei)
    Language: English
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    Online Resource
    Online Resource
    London : IntechOpen
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource , Illustrationen
    ISBN: 9781789855562 , 9781789859294
    URL: Volltext  (kostenfrei)
    Language: English
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Chemical Physics 189 (1994), S. 533-555 
    ISSN: 0301-0104
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Chemical Physics 189 (1994), S. 533-555 
    ISSN: 0301-0104
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 5
    facet.materialart.
    Unknown
    MDPI Publishing
    In: Symmetry
    Publication Date: 2011-07-21
    Description: The NICSzz-scan curves of aromatic organic, inorganic and “all-metal” molecules in conjunction with symmetry-based selection rules provide efficient diagnostic tools of the σ-, π- and/or double (σ + π)-aromaticity. The NICSzz-scan curves of σ-aromatic molecules are symmetric around the z-axis, having half-band widths approximately less than 3 Å with the induced diatropic ring current arising from Tx,y-allowed transitions involving exclusively σ-type molecular orbitals. Broad NICSzz-scan curves (half-band width approximately higher than 3 Å) characterize double (σ + π)-aromaticity, the chief contribution to the induced diatropic ring current arising from Tx,y-allowed transitions involving both σ- and π-type molecular orbitals. NICSzz-scan curves exhibiting two maxima at a certain distance above and below the molecular plane are typical for (σ + π)-aromatics where the π-diatropic ring current overwhelms the σ-type one. In the absence of any contribution from the σ-diatropic ring current, the NICSzz(0) value is close to zero and the molecule exhibits pure π-aromaticity.
    Electronic ISSN: 2073-8994
    Topics: Mathematics , Physics
    Published by MDPI Publishing
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 514-516 (May 2006), p. 397-401 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The p(O2)-T- diagrams of La2Ni1-xMxO4+ (M=Co and Cu, x= 0-0.20), determined by the coulometric titration technique at 923-1223 K in the oxygen partial pressure range 10-4 to 0.6 atm, can be adequately described by equilibrium processes of oxygen intercalation into the rock-salt type layers and hole localization on B-site cations forming 3+ oxidation states. For the hole activity, a non-ideal solution model taking into account the repulsion of p-type electronic charge carriers can be used. The electrostatic repulsion excludes occupation of nearest neighboring sites and leads to splitting of the energy levels for more distant sites. The affinity of Ni and Cu cations with respect to the hole localization is similar and cannot be statistically separated analyzing the oxygen nonstoichiometry data only. On the contrary, cobalt cations tend to remain in the trivalent state and Co3+ should be treated as a separate type of charged point defect. Oxygen vacancies formed in the perovskite-like layers due to intrinsic Frenkel disorder have no essential effect on the oxygen thermodynamics. As expected, the thermodynamic functions governing the intercalation-related processes are independent of defect concentrations
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 398 (1973), S. 88-96 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Untersuchungen Über die Wechselwirkung von Benzol und Arsen-, Antimon- und Wismut-Trisdithiocarbamat-Komplexen durch NMR-Spektroskopie.Die Bildung von VAN DER WAALS-Komplexen zwischen Trisdithiocarbamaten (gelöste Substanz) und Benzol (Lösungsmittel) wird untersucht, Als scheinbare Stöchiometrie der vorgeschlagenen Komplexe wurde 1:1 gefunden und ihre Assoziationskonstanten aus der Solvens-Verschiebung erhalten. Assoziationkonstanten wurden auf die Polarität von C—N-Bindungen in den Dithiocarbamat-Molekeln bezogen.
    Notes: Solvent shifts induced by the ring current of benzene in several trisdithiocarbamates of arsenic, antimony and bismuth are studied by NMR Spectroscopy. Formation of VAN DER WAALS complexes between trisdithiocarbamates (solute) and benzene (solvent) are proposed. The apparent stoichiometry of the proposed complexes has been found 1:1 and their association constants have been determined from the solvent shifts. The observed solvens shifts and the obtained association constants are correlated to the polarity of C—N bonds in the molecules of dithiocarbamates.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Structural chemistry 4 (1993), S. 349-361 
    ISSN: 1572-9001
    Keywords: Platinum complexes ; frontier molecular orbitals ; nucleophilic substitution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract EHMO-SCCC calculations have been used in the analysis of the electronic structure, chemical reactivity, and related properties of eight model platinum(II) complexes constituting the set of compounds formed in the reactions of planard 8-bis(dithiocarbonato) and/or bis-(dithiocarbamato)platinum(II) complexes with various nucleophiles. On the basis of the molecular orbital description of the complexes, the frontier molecular orbital approach of chemical reactivity, and the calculated potential energy surfaces, plausible mechanisms of their formation reactions and fluxional behavior have been deduced. Accordingly, a mechanism involving an early squarepyramidal transition state followed by a trigonal bipyramidal intermediate and a late distorted square-pyramidal transition state is proposed for the nucleophilic substitution of the one sulfur atom by the phosphine nucleophile in the Pt(S2COR)2 complex. Moreover, [Pt(S2COR)3]− is formed via a direct attack of the Pt(S2COR)2 by the ROCS2 − nucleophile through a charge-controlled nonrigid distorted square-pyramidal transition state. The inability of Pt(S2CNHR)2 to undergo analogous reactions is also discussed. An intramolecular mechanism is proposed for the conversion of [Pt(S2COR)3]− into [Pt(S2C=O)(S2COR)]−, which, upon reaction with an excess of phosphine gives Pt(S2C=O)(PH3)2, through a distorted trigonal bipyramidal transition state. The different reaction behavior of amines and/or phosphines with the xanthato complexes comparing to that of the ROCS2 − nucleophiles is also discussed. Finally, several suggestions concerning future experimental efforts are also proposed.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 417 (1975), S. 235-240 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Halogeno-bis(piperidyldiselenocarbamat)-Komplexe von Arsen, Antimon und WismutEs wird die Darstellung von 12 neuen Piperidyldiselenocarbamat-(Pipdsc)-Komplexen des Arsens, Antimons und Wismuts beschrieben aus Tris (piperidyldiseleno-carbamat)-Komplexen mit Halogen. Aus spektroskopischen und chemischen Beobachtungen wird ein Strukturvorschlag für die Verbindungen des Typus XM(Pipdsc) 2 abgeleitet. Weiterhin werden die Komplexe mit den entsprechenden Schwefelverbindungen verglichen.
    Notes: The preparation of twelve new piperidyldyldiselenocarbamate complexes of Arsenic, Antimony, and Bismuth is described. The reaction of the tri(piperidyldiselenocarbamate) complexes of arsenic, antimony, and bismuth with halogens produces halogeno-bi(piperidyldiselenocarbamate) complexes of the general formula XM(Pipdsc) 2 (X = Cl, Br or I and Pipdsc = (CH 2) 5 NCSe 2, M = As, Sb, Bi). Possible structures are discussed for these new complexes based on spectral and chemical observations. The properties and the spectroscopic data of the prepared compounds are compared to those of the corresponding dithiocarbamates.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 87-94 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Massenspektren von Trisdithiocarbamaten. Massenspektroskopische Untersuchung von Trisdithiocarbamat-Komplexen des Arsens, Antomons und WismutsZehn Trisdithiocarbamat-Verbindungen von Arsen, Antimon und Wismut wurden massenspektrometrisch untersucht. Ihre Fragmentationsweise und die Fragment-Ionen mit gleichen Strukturen werden diskutiert. Die Peaks der Molekül-Ionen wurden von allen Verbindungen nicht beobachtet. Die Fragment-Ionen mit der größten Massen-Zahl, die direkt aus den Molekül-Ionen hervorgehen, sind diejenigen mit einer um eine Dithiocarbamat-Gruppe kleineren Masseneinheit, was eine leichte Abspaltung einer Dithiocarbamat-Gruppe andeutet. Die beobachteten Peaks sind auf Elektronenstoß oder auf pyrolytische Zersetzung zurückzuführen. Die stärksten Peaks im oberen Massenzahl-Bereich aller Spektren entsprachen Polynuklear-Verbindungen der allgemeinen Formel MnSm, wobei M = As, Sb, Bi; S = Schwefel; n = 1, 2, 3, 4 und m = 0, 1, 2, 3, 4, 5 sind.
    Notes: Ten trisdithiocarbamate compounds of arsenic, antimony and bismuth are studied by mass spectrometry. Their fragmentation modes and the fragment ions with common structures are discussed. The molecular ion peaks were not observed in all compounds. The highest mass number fragment ions, which might be generated directly from the molecular ions, are those with less mass units, equal to a dithiocarbamate group; signifing a facile detaching of one of the dithiocarbamato groups. The observed peaks are attributed, either to electron impact or to pyrolytic decomposition. The most prominent peaks, in the higher mass number region of all the spectra, correspond to polynuclear compounds of the general formula MnSm, where M = As, Sb, Bi; S = sulfur; n = 1, 2, 3, 4 and m = 0, 1, 2, 3, 4, 5.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...