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PtS-Related {[CuI(F4TCNQII–)]−}∞ Networks
journal contribution
posted on 2016-02-19, 04:24 authored by Brendan F. Abrahams, Robert W. Elliott, Timothy A. Hudson, Richard RobsonA series
of compounds of composition A[CuI(F4TCNQII–)] (A = a quaternary ammonium
or phosphonium cation, F4TCNQII– = the dianionic form of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane)
have been synthesized and structurally characterized. In each structure,
an anionic [CuI(F4TCNQII–)]− framework possessing the topology of PtS is
formed with the Cu(I) center serving as a tetrahedral 4-connecting
center and the F4TCNQ2– anion acting
as a planar 4-connecting unit. Although a PtS topology is observed
for six different compounds, the anionic framework shows significant
geometric variation depending upon the identity of the cation. Very
similar structures are obtained when the organic cation is NMe4+, NMe2Pr2+, or NMe2Bu2+. A distorted
anionic structure possessing the same connectivity is generated when
the cation is NEt4+, and anionic frameworks
with a different connectivity, but still related to PtS, are obtained
when the much larger quaternary phosphonium cations are employed.
Of interest in the structures containing quaternary phosphonium cations
are π-stacking interactions involving phenyl groups of the cation
and F4TCNQ2– ligands. These face-to-face
interactions between the electron-rich F4TCNQ2– ligands and a phenyl group of the cation appear to
be responsible for the color exhibited by these compounds.