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Dispersion Interaction between Fluoranthene and Benzene in Cyclohexane

Authors :
Michio Kobayashi
Toshihiko Hoshi
Miki Hasegawa
Shigendo Enomoto
Tetsutaro Yoshinaga
Hiroshi Hiratsuka
Jun Okubo
Source :
Bulletin of the Chemical Society of Japan. 75:689-693
Publication Year :
2002
Publisher :
The Chemical Society of Japan, 2002.

Abstract

The electronic absorption spectra of fluoranthene (abbreviated as FA) were measured in various solvents together with the polarization spectrum with the aid of the stretched polymer film technique. The electronic structure of FA is discussed in comparison with MO calculated results. The polarization directions of the electronic transitions of FA were determined. For instance, the 404 (very weak) and 360.3 nm bands are polarized along the shorter and the longer (C2-) molecular axes, respectively. A weak van der Waals type FA–benzene complex formation was recognized in cyclohexane. The equilibrium constants for this complex formation were determined at various temperatures, e.g. K = 0.147 ± 0.03 dm3·mol-1 at 298 K. The enthalpy, entropy, and free-energy changes are estimated to be ΔH° = -5.9 ± 1.2 kJ·mol-1 (-1.4 ± 0.3 kcal·mol-1), ΔS°298 = -36 ± 1.0 J·K-1 mol-1 (-8.7 ± 0.24 cal·K-1 mol-1), and ΔG°298 = 4.7 ± 0.4 kJ·mol-1 (1.1 ± 0.1 kcal·mol-1). This ΔH° value is considerably small compared with the familiar...

Details

ISSN :
13480634 and 00092673
Volume :
75
Database :
OpenAIRE
Journal :
Bulletin of the Chemical Society of Japan
Accession number :
edsair.doi...........d48b5239038748fceb9cdff5e1a3399a
Full Text :
https://doi.org/10.1246/bcsj.75.689