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  • 1 Università di Cagliari, Cittadella Università di Monserrato Dipartimento di Scienze Chimiche 09042 Cagliari Italy
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Abstract  

A flow microcalorimeter has been used to determine excess enthalpies, HE, at 298.15 K of binary mixtures of dipentylether, dihexylether, 1,2-dimethoxyethane and 1,2-diethoxyethane (1)+benzene (2). These data along with the data available in the literature on HE, molar excess Gibbs energies, GE and liquid-vapour equilibria (LVE) of non-cyclic monoethers, acetals, polyethers and of cyclic mono- and di-ethers+benzene are examined on the basis of the DISQUAC group contribution model. Using a set of adjusted interchange energies parameters, structure dependent, the model provides a fairly consistent description of the thermodynamic properties as a function of concentration. The interaction parameters, dispersive and quasichemical, depend on the intramolecular environment of the O atom. There is clear evidence for the steric and inductive effects exerted by the alkyl groups adjacent to the O atom, for -O-C-O- proximity effect and for a ring strain effect. The steric effect results in a regular decrease of the dispersive interaction parameters of the oxygen/benzene (e,b) contact; The proximity effect of the O atoms produces a regular decrease and the ring strain a regular increase of the dispersive interaction parameters; the quasi-chemical remain constant.

Manuscript Submission: HERE

  • Impact Factor (2019): 2.731
  • Scimago Journal Rank (2019): 0.415
  • SJR Hirsch-Index (2019): 87
  • SJR Quartile Score (2019): Q3 Condensed Matter Physics
  • SJR Quartile Score (2019): Q3 Physical and Theoretical Chemistry
  • Impact Factor (2018): 2.471
  • Scimago Journal Rank (2018): 0.634
  • SJR Hirsch-Index (2018): 78
  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
  • SJR Quartile Score (2018): Q2 Physical and Theoretical Chemistry

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)