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Abstract:
Addition
of
small
amounts
of
Cr(N03)3
x
9
H20
during
the
hydrothermal
synthesis
of
SAPO-5
produced
pseudooctahedrally coordinated
chromium(III)
species within
the
unidimemsional
channel
system
of
the
molecular
sieve.
A
broad
intense
photoluminescence
that occurs
in
the visible region
upon
532
nm
photoexcitation
of
calcined
SAPO-5
is
efficiently
quenched
in
Cr-SAPO-5
allowing
for
unobstructed
detection
of
Raman
scattering spectra.
The
photoluminescence
quenching
mechanism
appears
to
involve
an
energy
transfer
from the
molecular
sieve
photoexcited
surface
states
to
the
metastable
chromium(III)
2E
state, giving
rise to the
well-known
chromium(III)
2E
-
4A2
luminescence
at
696
nm.
