10.1021/cg201073m.s001 Paolo Sgarbossa Paolo Sgarbossa Roberta Bertani Roberta Bertani Vito Di Noto Vito Di Noto Matteo Piga Matteo Piga Guinevere A. Giffin Guinevere A. Giffin Giancarlo Terraneo Giancarlo Terraneo Tullio Pilati Tullio Pilati Pierangelo Metrangolo Pierangelo Metrangolo Giuseppe Resnati Giuseppe Resnati Interplay between Structural and Dielectric Features of New Low k Hybrid Organic–Organometallic Supramolecular Ribbons American Chemical Society 2016 tran 3 b materials exhibit permittivity interaction 1 D chain δ values 3 b broadband dielectric spectroscopic determinations 2016-02-22 10:14:36 Journal contribution https://acs.figshare.com/articles/journal_contribution/Interplay_between_Structural_and_Dielectric_Features_of_New_Low_k_Hybrid_Organic_Organometallic_Supramolecular_Ribbons/2566324 The synthesis and characterization of low k one-dimensional (1D) hybrid organic–organometallic supramolecular ribbons <b>3a</b>,<b>b</b>, through halogen-bond driven co-crystallization of <i>trans</i>-[Pt­(PCy<sub>3</sub>)<sub>2</sub>(CC-4-py)<sub>2</sub>] (<b>1</b>) with 1,4-diiodotetrafluorobenzene (<b>2a</b>) and <i>trans</i>-1,2-bis-(2,3,5,6-tetrafluoro-4-iodophenyl)-ethylene (<b>2b</b>), are reported. The co-crystals <b>3a</b>,<b>b</b> have been obtained by isothermal evaporation of a chloroform solution containing the corresponding starting materials at room temperature. X-ray structure determinations show that noncovalent interactions other than halogen bonds help in the construction of the crystal packing; these interactions are stronger in <b>3b</b>, thus reducing the chain mobility with respect to <b>3a</b>. Accordingly, the broadband dielectric spectroscopic determinations, carried out from 10<sup>–2</sup> to 10<sup>7</sup> Hz and at a temperature ranging from 25 to 155 °C, showed that both <b>3a</b> and <b>3b</b> materials exhibit a real component of dielectric permittivity (ε′) significantly lower than SiO<sub>2</sub>. In particular in the case of <b>3b</b>, the rigidity of the 1D chain explains the observed ε″ and tan δ values. A permittivity value that is significantly lower than that of the silica reference, tan δ values lower than 0.02 in the entire investigated temperature range, and less than 0.004 at <i>T</i> < 100 °C make <b>3b</b> a very promising low k hybrid organic–organometallic material for application as dielectric films in next generation microelectronics.