Chemistry Reference
In-Depth Information
Figure 1.14. (a) Mo
3
S
7
[(dmit)
2
]
3
cluster and (b) view of the crystal structure
of the Mo
3
S
7
[(dmit)
2
]
3
solid parallel to the (001) plane. C, S and Mo atoms
are represented by black, medium grey and light grey balls, respectively.
P
3,
a
=
1
.
944 nm,
c
=
0
.
656 nm. Crystallographic data from Llusar
et al.
, 2004.
respectively, and
E
a
∼
30 meV, respectively. The crystal structure
of Mo
3
S
7
[(dmit)
2
]
3
is hexagonal and is shown in Fig. 1.14(b). The 3D packing
results in cavities with a diameter of 1 nm. This new semiconductor material leads
to the possibility of obtaining a series of new materials by chemically modifying
the cluster complex, which are also nanostructured, thus enabling in principle the
introduction of other molecules (guest) in their structure (host).
10 and
E
a
∼
Organic metals
In 1911 H. N. McCoy and W. C. Moore predicted
that it is possible to prepare
composite metallic substances from non-metallic constituent elements
, inspired
by their results on the preparation of tetramethylammonium-mercury amalgams
by cold electrolysis (McCoy & Moore, 1911). The prediction has come true, as
will be evident in this section, but it was not until 1954 that a relatively stable
perylene-bromine complex with conductivities up to 1
−
1
cm
−
1
was synthesized
(Akamatu
et al.
, 1954). Although the material reported in this work behaved as a
semiconductor with
E
a
=
055 eV, it can certainly be considered as the starting
point of an extremely productive field leading to a wealth of conducting organic
materials exhibiting remarkable results of fundamental interest. Since then, many
perylene-based conductors have been prepared, which are exhaustively reviewed
in Almeida and Henriques, 1997. The host of different conducting materials that
have been synthesized essentially retain the structure of a purely organic molecule
0
.
