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>(CC-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.