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  • 1
    Electronic Resource
    Electronic Resource
    Complexity theory of three-dimensional manifolds (1990)
    Springer
    Acta applicandae mathematicae 19 (1990), S. 101-130 
    Details
    ISSN: 1572-9036
    Keywords: 57Nxx ; Three-manifold ; special spine ; graph manifold
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The complexity of a 3-manifold is a whole number which measures how complicated a combinatorial description of the manifold must be. It has many pleasant properties, among which are the finiteness property and additivity property. The table of all closed orientable 3-manifolds of complexity ≤6 is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00049576
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrogen bonds and the structure of perchlorates of phosphorylated diazacycloalkanes (1994)
    Springer
    Russian chemical bulletin 43 (1994), S. 1902-1907 
    Details
    ISSN: 1573-9171
    Keywords: phosphorylated diazacycloalkanes ; perchlorates ; structure of protonation products ; H-bonds ; IR spectroscopy ; conformational analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Mono- and diperchlorates of phosphorylated diazacycloalkanes (PDAC),viz. 1,5-bis(2-diphenylphosphorylethyl) -1,5-diazacyclooctanes (1a, 1b), 1,4-bis(2-diphenylphosphorylethyl)- 1,4-piperazine (2a), and 1-methyl-4-(2-diphenylphosphorylethyl)-1,4-piperazines (3a, 3b), were prepared. The formation of inter- and intramolecular hydrogen bonds in PDAC perchlorates and some model compounds in the solid state and in solution was investigated by IR spectroscopy. The dependence between the effect of the hydrogen bond formation and association of the ions in solution was analyzed. Conformational analysis of the cations of PDAC was carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696325
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    Paper (German National Licenses)
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