Chemistry Reference
In-Depth Information
Fig. 2.7 Time evolutions of the luminescence intensity in [Pt(en)
2
][Pt(en)
2
Br
2
](ClO
4
)
4
-I. The
experimental results are shown by
solid lines
.
Dotted lines
shown the simulations (see [
61
]).
(Reprinted figure with permission from [
61
]. Copyright (1999) by the American Physical Society)
investigate nature and dynamical aspects of the gap states in that compound. To
solve this problem, Pt-Br and Pt-I chain compounds were subsequently studied, in
which photoinduced gap states are mobile and their dynamical aspects could be
clarified. Here, we introduce the comparative studies of the homometal compound,
[Pt(en)
2
][Pt(en)
2
Br
2
](ClO
4
)
4
-II, and the heterometal compound, [Pd(en)
2
][Pt
(en)
2
Br
2
](ClO
4
)
4
, using PA and PESR measurements [
52
]. As mentioned in
Sect. 2.2.2, the CDW ground states are degenerate in the former and nondegenerate
in the latter, so that solitons are stabilized only in the former. Such a difference in the
two compounds enables us to obtain a clear evidence for the photogeneration of
solitons. In [Pt(en)
2
][Pt(en)
2
Br
2
](ClO
4
)
4
, two monoclinic polymorphisms with the
space group
P
2
1
/m and
C
2/m were obtained [
10
,
11
] and labeled as I and II,
respectively, as already used. Hereafter, [Pt(en)
2
][Pt(en)
2
Br
2
](ClO
4
)
4
-II and
[Pd(en)
2
][Pt(en)
2
Br
2
](ClO
4
)
4
are abbreviated as Pt-Br-Pt-II and Pd-Br-Pt,
respectively.
Search WWH ::
Custom Search