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  • 1
    Electronic Resource
    Electronic Resource
    Effect of solvents on dielectric, spectroscopic and thermodynamic manifestations of intermolecular interactions. Iodine complexes of pyridine and picoline (1983)
    Springer
    Journal of solution chemistry 12 (1983), S. 355-367 
    Details
    ISSN: 1572-8927
    Keywords: Electric dipole moment ; solvent effects ; electron donoracceptor complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Dipole moments of pyridine and γ-picoline complexes with I2 in a number of nonpolar and weakly polar solvents were determined and the contributions of the dative structure FN in the ground state were estimated. The results are consistent with those calculated from the force constants of stretching vibrations v(N-l) and v (I-I). A good correlation of FN was found with respect to the solvent shift of the transition energy {ie355-1} in the I2 molecule bounded to amines and also to empirical parameters of solvent activities like rate constants of the Menshutkin reaction or the Dimroth-Reichardt parameter. No correlation exists between the solvent induced enhancement of the dipole moment and dielectric permittivity in terms of the Onsager reaction field theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01150444
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  • 2
    Electronic Resource
    Electronic Resource
    Multinuclear, variable-temperature NMR study of hydrogen bonding in two ortho-Mannich bases (1995)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 8 (1995), S. 463-467 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 1H and 13C NMR data for 2-diethylaminomethyl-3,4,6-tri- and -tetrachlorophenols in CH2Cl2 solutions at a variety of temperatures are reported. The results are consistent with intramolecular hydrogen bonding and proton transfer as shown in the structure 3. Concentration dependence of the NMR data for the perchloro compound shows an additional hydrogen bonding process attributed to the solute self-association. The 1H, 13C and 15N NMR data support the proposed proton transfer structure.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610080704
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    1H and 13C NMR studies of 1,8-bis(dimethylamino)naphthalene salts in acetonitrile-d3 (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 558-560 
    Details
    ISSN: 0749-1581
    Keywords: 1H ; NMR ; 13C ; NMR ; 1,8-Bis(dimethylamino)naphthalene ; salts ; Intramolecular ; NHN+ ; hydrogen bond ; Homoconjugated anions ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1H and 13C NMR spectra were studied for a number of 1,8-bis(dimethylamino)naphthalene (DMAN) salts in acetonitrile-d3. In the case of strong acids no counter anion effect was observed on the protonated DMAN molecules. A splitting of the 1H signal of the CH3 groups was found which was caused by coupling with the bridge NHN+ proton. It was confirmed that the salt with pentachlorophenol (PCP) undergoes a transformation to a nearly equimolar solution of free DMAN, protonated DMAN and the homoconjugated anion of PCP. The formation of the NHN+ bridge with an equally shared proton between the two nitrogen atoms leads to a change in the charge distribution in the naphthalene ring which is analogous to, but much weaker than, that found on protonation of aniline.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260290603
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