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'Solvent Effect' in keywords Facet   Publication Year 1981  [X]
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1Author    CliffordW. Fonga, HamishG. GrantRequires cookie*
 Title    Solvent Effects on the Carbon - 13 NMR Chemical Shifts and Rotational Barriers of N,N-Dimethylbenzamide - Solvent Enhanced n Polarization  
 Abstract    The 13 C NMR chemical shifts of N,N-dimethylbenzamide in thirty solvents have been measured at high dilution. The solvent induced chemical shifts (s.i.c.s.) of the carbonyl group carbon atom in twenty three solvents and the thermodynamic barriers to rotation about the C-N bond in eleven solvents are linearly related to the solvent parameter, ET(30). Multi-parametric analysis of the carbonyl s.i.c.s. indicates hydrogen bond donor effects are more important than polar effects. Rotational barriers for N,N-dimethylbenz-amide may be determined by measurement of the 13 C chemical shift of the carbonyl group in a particular solvent. The s.i.c.s. of the aromatic ring carbon atoms may be explained by the polarization of the aromatic ji electron system induced by the solvent enhanced polarization of the dimethylcarboxamido moiety. Hydrogen bonding solvents and polar solvents result in two effective dipoles on the dimethylcarboxamido moiety, which polarize the aromatic n electron system differently. 
  Reference    Z. Naturforsch. 36b, 585—595 (1981); received May 19 1980/January 21 1981 
  Published    1981 
  Keywords    Solvent Effects, 13 C NMR Spectra Rotational Barriers, N, N-Dimethylbenzamide 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0585.pdf 
 Identifier    ZNB-1981-36b-0585 
 Volume    36 
2Author    J. Manzur, G. GonzálezRequires cookie*
 Title    Solvent Effects on the IR Spectra of N-Methylacetamide  
 Abstract    The solvent effect on the v(N-H) amide I and amide II IR bands of N-methylacetamide were investigated. The frequency shifts could be related to the solvent donor and acceptor num-bers by mean of a two parameters relationship that accounts for the mutual influence between the two interacting sites of the amide. 
  Reference    Z. Naturforsch. 36b, 763—764 (1981); received January 2 1981 
  Published    1981 
  Keywords    Solvent Effect, Amidic Bond, N-Methylacetamide, Hydrogen Bonding Interactions 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0763_n.pdf 
 Identifier    ZNB-1981-36b-0763_n 
 Volume    36 
3Author    Waldemar Adam, Omar CuetoRequires cookie*
 Title    3,3-Dimethyl-4 [2-methyl-l-propenyl] -1,2-dioxetane: Its Thermal Stability and Chemiluminescent Properties  
 Abstract    The alkenyl-substituted 1,2-dioxetane (1) was prepared by photosensitized singlet oxygenation of 2,5-dimethyl-2,4-hexadiene and its activation and excitation parameters determined. It is shown that dioxetane (1) is comparable in its thermal stability to alkyl-substituted dioxetanes and an inefficient chemical source of electronic excitation. 
  Reference    Z. Naturforsch. 36b, 1653—1654 (1981); received June 29 1981 
  Published    1981 
  Keywords    1, 2-Dioxetanes, Chemüuminescence, Activation Parameters, Excitation Yields, Solvent Effects 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1653.pdf 
 Identifier    ZNB-1981-36b-1653 
 Volume    36