Preparation and X-ray crystal structures of the first radical cation salts of4-iodotetrathiafulvalene: [ITTF.+]2{Pd[S2C2(CN) 2]2}2- and ITTF .+HSO4-
Abstract
The title radical ion salts of 4-iodotetrathiafulvalene1 have
been prepared and their X-ray crystal structures determined at 150 K. The
2:1 salt [ITTF
.+
]
2
{Pd[S
2
C
2
(CN)
2
]
2
}
2-
3forms a mixed stack structure in which the
Pd(mnt)
2
anions intermingle with pairs of iodo-TTF radical
cations, i.e. a DDADDA stacking arrangement. The structure of the
1:1 salt ITTF
.+
HSO
4
-
4
comprises stepped stacks of ITTF cations with two alternating modes of
overlap. Between the cation stacks there are infinite chains of
hydrogensulfate anions, linked by hydrogen bonds. Both structures are
characterised by short intermolecular contacts involving the iodine
substituent.
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