10.1021/cg400420h.s001 Brendan F. Abrahams Brendan F. Abrahams Robert W. Elliott Robert W. Elliott Timothy A. Hudson Timothy A. Hudson Richard Robson Richard Robson PtS-Related {[Cu<sup>I</sup>(F<sub>4</sub>TCNQ<sup>II–</sup>)]<sup>−</sup>}<sub>∞</sub> Networks American Chemical Society 2016 phenyl group phenyl groups phosphonium cation dianionic form framework NMe compound PtS topology quaternary ammonium quaternary phosphonium cations 2016-02-19 04:24:06 Journal contribution https://acs.figshare.com/articles/journal_contribution/PtS_Related_Cu_sup_I_sup_F_sub_4_sub_TCNQ_sup_II_sup_sup_sup_sub_sub_Networks/2399344 A series of compounds of composition A­[Cu<sup>I</sup>­(F<sub>4</sub>­TCNQ<sup>II–</sup>)] (A = a quaternary ammonium or phosphonium cation, F<sub>4</sub>­TCNQ<sup>II–</sup> = 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 [Cu<sup>I</sup>­(F<sub>4</sub>­TCNQ<sup>II–</sup>)]<sup>−</sup> framework possessing the topology of PtS is formed with the Cu­(I) center serving as a tetrahedral 4-connecting center and the F<sub>4</sub>­TCNQ<sup>2–</sup> 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 NMe<sub>4</sub><sup>+</sup>, NMe<sub>2</sub>­Pr<sub>2</sub><sup>+</sup>, or NMe<sub>2</sub>­Bu<sub>2</sub><sup>+</sup>. A distorted anionic structure possessing the same connectivity is generated when the cation is NEt<sub>4</sub><sup>+</sup>, 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 F<sub>4</sub>­TCNQ<sup>2–</sup> ligands. These face-to-face interactions between the electron-rich F<sub>4</sub>­TCNQ<sup>2–</sup> ligands and a phenyl group of the cation appear to be responsible for the color exhibited by these compounds.