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Titolo:
MOLECULAR ASSOCIATION OF NORMAL ALKANOIC ACIDS WITH THEIR THALLIUM(I)SALTS - A NEW HOMOLOGOUS SERIES OF FATTY-ACID METAL SOAPS
Autore:
FERNANDEZGARCIA M; GARCIA MV; REDONDO MI; CHEDA JAR; FERNANDEZGARCIA M; WESTRUM EF; FERNANDEZMARTIN F;
Indirizzi:
CSIC,INST FRIO,CIUDAD UNIV E-28040 MADRID SPAIN CSIC,INST FRIO E-28040 MADRID SPAIN UNIV MICHIGAN ANN ARBOR MI 48109 UNIV COMPLUTENSE MADRID,DEPT QUIM FIS MADRID SPAIN
Titolo Testata:
Journal of lipid research
fascicolo: 2, volume: 38, anno: 1997,
pagine: 361 - 372
SICI:
0022-2275(1997)38:2<361:MAONAA>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHASE-BEHAVIOR;
Keywords:
THALLIUM(I); HYDROGEN DIALKANOATES; THERMODYNAMICS OF PHASE TRANSITIONS; CH2 CONFORMATION-CONFIGURATION-PACKING; LAMELLAR STRUCTURES; ENERGY STORAGE MATERIALS; DIFFERENTIAL SCANNING CALORIMETRY; FOURIER TRANSFORM INFRARED SPECTROSCOPY; NUCLEAR MAGNETIC RESONANCE SPECTROMETRY; RAMAN; X-RAY DIFFRACTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
M. Fernandezgarcia et al., "MOLECULAR ASSOCIATION OF NORMAL ALKANOIC ACIDS WITH THEIR THALLIUM(I)SALTS - A NEW HOMOLOGOUS SERIES OF FATTY-ACID METAL SOAPS", Journal of lipid research, 38(2), 1997, pp. 361-372

Abstract

A new homologous series of thallium(I) hydrogen dialkanoates, fatty acid thallium soaps, from the dipropane up to the ditetradecane is reported for the first time. This association with 1:1 stoichiometry is the only one exhibited by the thallium derivatives. They have been prepared by solidification of molten mixtures with equimolar proportions ofacid and corresponding neutral salt, although crystallization from ananhydrous ethanolic solution of the mixture has also been successful in getting pure compounds with largest chain lengths. Vibrational spectroscopies clearly characterize these crystalline compounds as very strong hydrogen bonding systems. Assignations of active modes in proton and carbon nuclear magnetic resonance spectrometry (NMR) (in ethanol) and infrared (IR) and Raman spectra (in solid state) are reported. According to X-ray diffraction (XRD) they have monomolecular lamellar structures with the acyl chains arranged up and down to the cation/H-bondnetwork in a methyl-to-methyl fashion, and vertically oriented to thebasal plane. The acyl chains present all-trans conformation and alternating configuration (perpendicular orthorhombic subcell), like the beta'-phases of other kinds of lipids. Lamellar thickness is reported for the six room-temperature crystalline members. The molecular compounds present polymorphism, one crystal/crystal transition at temperaturesclose to the peritectical melting. Phase transition thermodynamics are also given and discussed with respect to their acid and salt parents. Their incongruent melting involves nearly 90% of the total enthalpicincrements of both constituents' melting processes, making these compounds potential thermal energy storage materials.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 15:24:48