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a
Pt
4+
Pt
2+
Pt
4+
Pt
2+
CDW
ground state
X
-
Pt
4+
Pt
3+
Pt
3+
Pt
2+
CT exciton
(FE)
X
-
Displacements of
X
Pt
4+
Pt
3+
Pt
3+
Pt
2+
STE
b
Energy
FE
STE
Absorption
PL
Q
Fig. 2.6 (a) Schematic of the CDW ground state, the CT exciton (FE), and the STE. (b) Schematic
of the adiabatic potential curves of the CT exciton (FE) and the STE as a function of the
deformation coordinate (see the text)
photoinduced absorption (PA) spectroscopy, which had been indeed used for the
studies of solitons, polarons, and bipolarons in conjugated polymers [
2
], and a
number of important information were obtained. Photoinduced electron spin reso-
nance (PESR) could also detect sensitively photoexcited species with spins. Those
measurements were performed on the MX-chain compounds to clarify nature of
photogenerated species.
At the beginning of those studies, the Pt-Cl chain compound, [Pt(en)
2
][Pt
(en)
2
Cl
2
](ClO
4
)
4
, had been extensively studied. In this compound, however, photo-
induced gap states were very stable and not mobile so that they never decayed at low
temperatures once they were photogenerated. Therefore,
it was difficult
to
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