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TRPy[1,3,6,8-tetrakis(alkythio)pyrenes,R=C2H5 and C3H7] which
contain conjugated π system and hehave as electron donors are
synthesized and used to form complexes with M(mnt)2-(mnt2-=
cis-1,2-dicyano-1,2-ehtylenedithiolate;M=Ni,Co and Pt),TCNE(
tetracyanoethene),and iodine. Infrared and ultra violet-visible
spectra indicate that [TRPy][M(mnt)2] and [TRPy]Ix complexes are
ionic and [TPPy][TCNE] is neutral, in their ground states.
Temperature-varied magnetic susceptibility measurements exhibit
that at low temperature there are ferromagnetic interactions in
[TEPy][Ni(mnt)2] and anti-ferromagnetic interactions in
[TPPy][M(mnt)2] (M=Ni and Pt);the rest complexes are essentially
diamagnetic. The results suggest that the structures of
[TRPy][M(mnt)2] consist of dimerized,segregated stacks of
cations and anions. Conductivity measurement show that all the
complexes are semiconductive in the measured temperature range,
consistent with the suggested structures. The crystal structure
of [TPPy][TCNE] has been determined by single-crystal X-ray
diffraction analysis. The complex belongs to the triclinic space
group P1,a=9.320(3),b=9.407(2),c=9.922(2) A,α=73.55(2),
β=70.09(2),γ=82.42(2)。,V=783.8(4) A3,Dcal=1.328 g cm-3,Z=1.
The crystal structure consists of stacks of alternating TPPy and
TCNE with uniform spacing.
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