Chemistry Reference
In-Depth Information
Fig. 8
A view of both types of I
···
Iinteractionsin(EDT-TTF-I
2
)(I
3
)
Table 3
Halogen bond distances and angles in various salts with I
3
-
Interaction
D
anis
Br(I)I
θ
1
θ
2
Refs.
(A)
(A)
(
◦
C)
(
◦
C)
(BTM - TTF - Br
2
)
2
(I
3
)
C - Br
···
I
3.67
3.635(1)
163.6(3)
72.08(3)
[61, 64]
(EDT - TTF - Br
2
)
2
(I
3
)
C - Br
···
I
3.67
3.51(5)
165.3(1)
110.48(2)
[66]
···
(EDO - TTF - I
2
)(I
3
)
C - I
I
3.89
3.40(2)
173.2(2)
133.1(3)
[67]
3.399(8)
163.4(2)
71.54(2)
(EDT - TTF - I
2
)
2
(I
3
)
C - I
···
I
3.89
3.55(5)
164.8(2)
107.21(2)
[66]
1 Scm
-1
, a large value when compared with other
β
β
-
structures such as
(BEDT-TTF)
2
(ICl
2
).
3.3.1.3
Halometallate Anions as Halogen Bond Acceptors
Only a few recent examples of halogen bonding of halogenated TTFs with
halometallate anions have been described and this most probably represents
a broad development field in this area. Indeed, these halometallate salts of-
fer a wide variety of complexes and specifically here a large variation of
the ratio of anion charge vs number of halide atoms, as already discussed
above in the comparison between Br
-
and I
3
-
salts. This point is illustrated
by the superb structures of two salts of EDT-TTF-I
2
with the polymeric
one-dimensional PbI
3
-
6
I
2
)
3
(Fig. 9) and two-dimensional (Pb
5
/
6
anions
1
/
I
anion
contacts are observed with the linear PbI
3
-
chains
where shorter C - I
···
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