Solid solutions of coronene, perylene, and pyrene in monocrystalline n ‐heptane have been prepared by slow cooling. The solutes exhibit dichroic absorption, fluorescence, and phosphorescence spectra that make evident an orientation of aromatic molecules in the paraffinic crystal lattice. Molecular aromatic planes are found to be nearly perpendicular to the growth axis, while their largest axis is oriented in the direction of alkane chains. The sites in which the molecules are trapped appear to be similar to the ones obtained with low concentrated quickly frozen solutions. Although aggregates could be present, they are not observed.
REFERENCES
1.
2.
3.
4.
E. V.
Shpol’skii
, L. A.
Klimova
, G. N.
Nervesova
, and V. I.
Glyadkovskii
, Opt. Spectrosc.
24
, 25
(1968
).5.
L. A.
Klimova
, A. I.
Ogloblina
, and V. I.
Glyadkovskii
, Opt. Spectrosc.
30
, 384
(1971
).6.
7.
8.
9.
(c) Thesis, Grenoble, 1973.
10.
11.
L. E. Lyons and G. C. Morris, J. Chem. Soc., 3661 (1957).
12.
(a)
P.
Bothorel
, C.
Such
, and C.
Clement
, J. Chim. Phys.
69
, 1453
(1972
).P.
Bothorel
and C.
Lussan
, 269
, 792
(1969
).13.
14.
G. W.
Canters
, J.
van Egmond
, T. J.
Schaafsma
, and J. H.
van der Waals
, Mol. Phys.
24
, 1203
(1972
).15.
(a)
C.
Pfister
and J.
Kahane‐Paillous
, J. Chim. Phys.
65
, 875
(1968
).(b) M. Lamotte, thèse, Bordeaux, 1973.
16.
N.
Norman
and H.
Mathisen
, U.S. Dept. Comm. Office, Tech. Serv. PB, Dept.
171
, 181
(1960
).17.
18.
19.
J. J.
Dekkers
, G. Ph.
Hoornweg
, C.
MaClean
, and N. H.
Velthorst
, Chem. Phys. Lett.
19
, 517
(1973
).20.
E. W.
Thulstrup
, J.
Michl
, and J. H.
Eggers
, J. Phys. Chem.
74
, 3868
(1970
).21.
22.
23.
24.
S. P. Mcglynn, T. Azumi, M. Kinoshita, Molecular Spectros copy of the Triplet State, International Series in Chemistry (Prentice‐Hall, New Jersey, 1969).
25.
J. Friedel, Dislocation (Pergamon, London, 1964).
26.
J. M. Thomas and J. O. Williams, Progress in Solid State Chemistry (Pergamon, London, 1971), Vol. 6, p. 119.
This content is only available via PDF.
© 1974 American Institute of Physics.
1974
American Institute of Physics
You do not currently have access to this content.
