ZfN: Search Results

1	Author	M. Wichmann, M. Stockhausen	Requires 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

2	Author	Cungen Zhang, Christoph Janiak, Horst Brombacher	Requires cookie*
	Title	Structural Influence of Hydrogen Bonding and ^r-Stacking in fra/is-Diazido-tetra- kis(pyrazole)nickel(II) and rra/is-Diazido-tetrakis(3-methylpyrazoIe)nickel(II)
	Abstract	The molecular nickel complexes fra«s-diazido-tetrakis(pyrazole)nickel(II) and trans-dia-zido-tetrakis(3-methylpyrazole)nickel(II) feature terminal monohapto-bound azide ligands. The pyrazole (pyr) ring planes are aligned along the Nazide-Ni-Nazide axis by intramolecular N-H—Nazide bonds. The crystal packing is controlled by jr-stacking between both pyrazole rings and azide ligands, N -H —Nazide hydrogen bonds, and intermolecular N-H—jrpyr and C-H —N/jrazide interactions.
	Reference	Z. Naturforsch. 56b, 1205—1208 (2001); received July 20 2001
	Published	2001
	Keywords	Nickel Complexes, ^-Stacking, Hydrogen Bonding
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	TEI-XML for	default:Reihe_B/56/ZNB-2001-56b-1205.pdf
	Identifier	ZNB-2001-56b-1205
	Volume	56

3	Author	Swathi Pisupati, P. A. Kumar, V.G K M Pisipati	Requires 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