Evidence of an odd-even effect on the thermodynamic parameters of odd fluorotelomer alcohols
authors Costa, JCS; Fulem, M; Schroder, B; Coutinho, JAP; Monte, MJS; Santos, LMNBF
nationality International
journal JOURNAL OF CHEMICAL THERMODYNAMICS
author keywords Volatility; Odd-even effect; Perfluorinated compounds; Odd fluorotelomer alcohols; Thermodynamics; Phase transitions; Triple point; Vapour pressures; Enthalpy; Entropy; Volatility; Fusion; Sublimation; Vaporization
keywords ALIPHATIC DICARBOXYLIC-ACIDS; HIGHLY FLUORINATED COMPOUNDS; MELTING-POINT ALTERNATION; VAPOR-PRESSURE; PERFLUORINATED COMPOUNDS; PARTITIONING BEHAVIOR; AQUEOUS SOLUBILITY; ORGANIC-COMPOUNDS; SOILS; WATER
abstract A phase transition study, including vapour pressure determinations of odd fluorotelomer alcohols {oFTOH; CF3(CF2)(n)CH2OH, with n = 5 to 9}, is reported in order to explore the effect of the successive introduction of -CF2- groups into the molecule on the thermodynamic properties related to (solid + liquid, solid + gas, and liquid + gas) equilibria. An odd-even effect on the thermodynamic parameters of fusion and sublimation was observed in the homologous series of odd fluorotelomer alcohols indicating an increase of the stability in the crystal packing for the members with an odd number of carbon atoms. The vaporization parameters of o-FTOH were compared with the literature data for their alkane analogues and the results showed a higher volatility of liquid fluorotelomer alcohols than their congeners. The higher molecular conformation restriction of perfluorinated alcohols and/or the higher molar mass seems to contribute to their higher entropy of vaporization which drives the volatility of the 1H,1H-perfluorinated alcohols. (C) 2012 Elsevier Ltd. All rights reserved.
publisher ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
issn 0021-9614
year published 2012
volume 54
beginning page 171
ending page 178
digital object identifier (doi) 10.1016/j.jct.2012.03.027
web of science category Thermodynamics; Chemistry, Physical
subject category Thermodynamics; Chemistry
unique article identifier WOS:000306491500023
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 2.888
5 year journal impact factor 2.5
category normalized journal impact factor percentile 64.563
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg