Chemistry Reference
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Fig. 10.2 Perspective view of the region around H
3
NC
3
H
6
NH
3
2+
along
c
-axis of K
2
(NC
3
N)
[Pt
2
(pop)
4
I]
4H
2
O
black
,C;
blue
,N;
red
, O(ligand);
light blue
, O(H
2
O);
orange
,P;
brown
,K;
purple
,I;
yellow
, Pt). Hydrogen atoms are omitted for clarity
However, in some MMX chains with binary countercations, the bridging halide
was disordered because of the random arrangement of the chains. Therefore,
polarized Raman spectroscopy was performed to distinguish CDW state,
which induces two peaks derived from symmetric-stretching mode of Pt-Pt bonds
[Pt(III)-Pt(III) and Pt(II)-Pt(II)], from CP and ACP state, which induce only one
peak [Pt(II)-Pt(III)] [
23
,
24
,
32
,
33
]. Consequently, two peaks observed around
100 cm
1
indicate the existence of CDW-like distortion in MMX chains with
binary countercations [
31
].
According to the crystal structure analyses, the complexes containing
cis
-NC
4
N
2+
,
trans
-NC
4
N
2+
,NC
5
N
2+
,orNC
2
OC
2
N
2+
have unique Pt-I-Pt distance
(
d
(Pt-I-Pt)). Therefore, these complexes are in typical CDW state.
However, in the complexes containing NC
3
N
2+
, Me-NC
3
N
2+
, or Cl-NC
3
N
2+
,
there are two kinds of
d
(Pt-I-Pt), which are the characteristics of ACP state.
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