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Fig. 9.3 Packing diagrams projected down the
c
and
a
axes for (a) [Pt
2
(MeCS
2
)
4
I]
1
(1) and
(b) [Pt
2
(EtCS
2
)
4
I]
1
(2)[
28
,
32
]. The dashed lines represent the interchain S
S contacts, which are
relatively close to the van der Waals contact distance between sulfur atoms (3.60
˚
)
AsshowninFig.
9.3
, the neighboring 1D chains of 1 and 2 along the
a
axis are
mutually shifted by 0.5
b
owing to the relation of the
C
lattice. Adjacent 1D
chains along the
c
axis are related by the
c
glide plane, and hence the two PtS
4
planes of diplatinum units in the neighboring 1D chains twist in opposite
directions. It is noteworthy that the arrangement of neighboring 1D chains
along the
c
axis of 2 is different from that of 1. Neighboring chains along
c
are
shifted by about 0.5
b
in 1 but are shifted by only 0.444
˚
(293 K) in 2.The
S contact distances are 3.812 and 3.847
˚
in 1, which are
relatively close to the van der Waals contact distance between sulfur atoms
(3.60
˚
), indicating the existence of two-dimensional (2D) interaction parallel
to the
bc
plane [
28
]. On the other hand, the shorter interchain S
interchain S
S distances in
2 are 4.140 (2) and 4.663 (2)
˚
, indicating no interchain S
S contacts [
32
].
Therefore, one-dimensionality of 2 is enhanced by the introduction of the ethyl
group into dithiocarboxylato ligand instead of the methyl group. Interchain
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