Study of the effect of β-cyclodextrin on the photophysics
of alloxazines
in the solid state
Abstract
The influence of β-cyclodextrin (β-CD) on
the photophysics of alloxazines† (lumichrome, Lch;
7-methylalloxazine, 7MA11; and 8-methylalloxazine, 8MA11) has been
studied in the solid state by ground-state absorption and steady-state
fluorescence methods. We support the existence of inclusion complexes
between Lch and β-CD in water. The presence of similar
complexes for 7MA11 and 8MA11 has also been found. Complexes of
alloxazines and β-CD are also present in the solid state.
The formation of hydrogen bonds in solid inclusion complexes between
alloxazines and β-CD have been postulated in order to
explain the luminescence behaviour of these solid complexes. New
spectroscopic evidence has been found in the solid state of doubly
hydrogen-bonded lumichrome dimers capable of executing double proton
transfer in the excited state.
† (lumichrome, Lch;
7-methylalloxazine, 7MA11; and 8-methylalloxazine, 8MA11) has been
studied in the solid state by ground-state absorption and steady-state
fluorescence methods. We support the existence of inclusion complexes
between Lch and β-CD in water. The presence of similar
complexes for 7MA11 and 8MA11 has also been found. Complexes of
alloxazines and β-CD are also present in the solid state.
The formation of hydrogen bonds in solid inclusion complexes between
alloxazines and β-CD have been postulated in order to
explain the luminescence behaviour of these solid complexes. New
spectroscopic evidence has been found in the solid state of doubly
hydrogen-bonded lumichrome dimers capable of executing double proton
transfer in the excited state.
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in the solid state