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'Hydrogen bonding' in keywords Facet   Publication Year 2001  [X]
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2001[X]
1Author    M. Wichmann, M. StockhausenRequires cookie*
 Title      
 Abstract    Relaxation spectra have been measured at 20°C for mono-, di-and triethanolamine in the pure liquid state and in a 0.6 mole fraction mixture with 1,4-dioxane. The general resemblance to the dielectric behaviour of alcohols and aminoalcohols shows that relaxation is governed by association effects. In this regard, several features point to significantly differing behaviour of the mono compound in comparison with both di-and triethanol­ amine. 
  Reference    Z. Naturforsch. 56a, 603—604 (2001); received June 18 2001 
  Published    2001 
  Keywords    Association, Dielectric Spectroscopy, Hydrogen Bonding, Liquids 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0603_n.pdf 
 Identifier    ZNA-2001-56a-0603_n 
 Volume    56 
2Author    Swathi Pisupati, P. A. Kumar, V.G K M PisipatiRequires cookie*
 Title    Induced Smectic-G Phase through Intermolecular Hydrogen Bonding Part IX: Comparative Thermal and Phase Behaviour Studies on Two Distinct Structural Isomers Possessing Linear and Bow Shapes  
 Abstract    Two novel intermolecular hydrogen bonding mesogenic series comprising two distinct structural iso­ mers nABA:R:nABA and «ABA:H:«ABA (where R = resorcinol; H = hydroquinone; nABA = p-n-al-kyloxybenzoic acid with the alkyl carbon number varying from propyl-to decyl-and dodecyl-) have been synthesized using resorcinol and hydroquinone as central bent and linear cores, respectively. The thermal and phase behaviour of these complexes is studied by thermal microscopy and differential scan­ ning calorimetry. The IR spectral data confirm the formation of intermolecular hydrogen bonding between the OH group of the non-mesogen and -COOH group of the nABA moiety. Thermal studies reveal the existence of new phases: smectic-A and smectic-G. Comparative phase transition studies sug­ gest that these isomers exhibit a different trend of mesomorphism. 
  Reference    Z. Naturforsch. 56a, 692—696 (2001); received July 4 2001 
  Published    2001 
  Keywords    Hydrogen Bonding, Thermal, Phase Behaviour, rtABA:R:rcABA, nABA:H:rcABA 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0692.pdf 
 Identifier    ZNA-2001-56a-0692 
 Volume    56