1 research outputs found
Pressure-Induced Conductivity in a Neutral Nonplanar Spin-Localized Radical
Souto, Manuel et al.There is a growing interest in the development of single-component molecular conductors based on neutral organic radicals that are mainly formed by delocalized planar radicals, such as phenalenyl or thiazolyl radicals. However, there are no examples of systems based on nonplanar and spin-localized C-centered radicals exhibiting electrical conductivity due to their large Coulomb energy (U) repulsion and narrow electronic bandwidth (W) that give rise to a Mott insulator behavior. Here we present a new type of nonplanar neutral radical conductor attained by linking a tetrathiafulvalene (TTF) donor unit to a neutral polychlorotriphenylmethyl radical (PTM) with the important feature that the TTF unit enhances the overlap between the radical molecules as a consequence of short intermolecular S···S interactions. This system becomes semiconducting upon the application of high pressure thanks to increased electronic bandwidth and charge reorganization opening the way to develop a new family of neutral radical conductors.This work was supported by the EU ITN iSwitch 642196 DGI
grant (BeWell; CTQ2013-40480-R), the Networking Research
Center on Bioengineering, Biomaterials, and Nanomedicine
(CIBER-BBN), and the Generalitat de Catalunya (grant 2014-
SGR-17). This work has also been supported by MINECO
through the projects CSD2007-00045, CTQ2012- 38599-C02-
02 and CTQ2013-48252-P. ICMAB acknowledges support
from the Spanish Ministry of Economy and Competitiveness,
through the “Severo Ochoa” Programme for Centres of
Excellence in R&D (SEV- 2015-0496). M.S. is grateful to
Spanish Ministerio de Educación, Cultura y Deporte for a FPU
grant and he is enrolled in the Material Science Ph.D. program
of UAB. D.B. is grateful to the EC ITN Nano2fun grant
no607721. M.P.A. is grateful to the Spanish Ministerio de
Educación, Cultura y Deporte for an FPU grant. M.P.A. and
V.G.B. thank the project CTQ2015-67755-C2-1-R. H.O.
Jeschke, M. Tomic and R. Valenti thank the Deutsche
Forschungsgemeinschaft (DFG) for funding through grant
SFB/TRR49 and Steve Winter for useful discussions. We thank
Carlos Goḿ ez-Garcıá (Univ. Valencia) for SQUID measurements
as well as Xavier Fontrodona (Univ. Girona) for X-ray
diffraction measurements and Mercedes Taravillo (UCM) for
the support provided during the high pressure Raman
measurements.Peer reviewe