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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Molecular engineering 3 (1993), S. 157-169 
    ISSN: 1572-8951
    Schlagwort(e): Polyoxovanadates ; mixed valence ; Heisenberg exchange ; spin frustration-antiferromagnetic coupling ; spin delocalization ; bond valence ; template synthesis ; structural ; magnetic correlations ; irreducible tensor operators
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Oxovanadium clusters provide novel examples of large magnetic clusters, which may showin nuce the typical behavior of bulk magnetic materials. The paper reviews the magnetic properties of V15, comprising fifteen oxovanadium(IV); V14, comprising fourteen oxovanadium(IV); V3+1, comprising three localized oxovanadium(IV), six localized oxovanadium(V), and one oxovanadium(IV) delocalized over three sites; V4+2 and V4+4 which comprise four localized and two and four delocalized oxovanadium(IV), respectively. The different observed magnetic behaviors are discussed on the basis of several models of different sophistication.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 2079-2086 
    ISSN: 1434-1948
    Schlagwort(e): N Ligands ; Copper ; Coordination polymers ; Stability constants ; Solid-state structures ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A series of linear primary polyamines H2N-CH2-(CH-NH2)n-CH2-NH2 (1 ≤ n ≤ 3) was prepared from the corresponding polyalcohols. The polyamines were isolated as HCl adducts and the acidity constants in aqueous solution were determined. The crystal structure of the fully protonated tetraamine (n = 2) was elucidated by an X-ray diffraction study. Complex formation of the triamine (n = 1) with Ni2+, Cu2+, Zn2+, Cd2+ was re-investigated in aqueous solution. The pH-dependent formation of a variety of species MxLyHz was established by potentiometric titrations and was compared with previous reports. The crystal structure of the Cu complex [CuL2]Cl2 exhibited a chain structure with a five-coordinate CuII centre in which two amino groups of the triamine ligands are coordinated to one Cu centre, while the third amino group of one of the ligands is bonded to a neighbouring Cu atom. The compound shows weak antiferromagnetic coupling interactions between the CuII centres within the chain.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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