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Low-Temperature Mobility of Thionine in a Faujasite Cage

Published online by Cambridge University Press:  15 February 2011

F. W. Deeg ,
M. Ehrl  and
C. Bräuchle
F. W. Deeg
Affiliation:
Institut für Physikalische Chemie, Universität München, Sophienstrasse 11, D-80333 München, Germany
M. Ehrl
Affiliation:
Institut für Physikalische Chemie, Universität München, Sophienstrasse 11, D-80333 München, Germany
C. Bräuchle
Affiliation:
Institut für Physikalische Chemie, Universität München, Sophienstrasse 11, D-80333 München, Germany
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Abstract

We have used low-temperature optical spectroscopy to characterize the guest/host interaction of thiazine and oxazine dyes encapsulated in the three-dimensional pore structure of faujasite cages. The system thionine in dehydrated zeolite-Y exhibits a thermal and optical equilibrium between two spectroscopically distinguishable species. Temperature-dependent measurements allow the determination of the energy difference and barrier between these two forms as 170 cm−1 and 120 cm−1, respectively. The two forms are associated with two different locations/conformations of the chromophore within the faujasite pore structure. The degree of freedom responsible for the interconversion of the two forms is extremely sensitive to the relationship between molecular size and form of the void.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 366: Symposium N – Dynamics in Small Confining Systems , 1994 , 277
Copyright
Copyright © Materials Research Society 1995

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References

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