Abstract
During the last years there has been a high interest in the development of new purely-organic single-component conductors. Very recently, we have reported a new neutral radical conductor based on the perchlorotriphenylmethyl (PTM) radical moiety linked to a monopyrrolo-tetrathiafulvalene (MPTTF) unit by a π-conjugated bridge (1) that behaves as a semiconductor under high pressure. With the aim of developing a new material with improved conducting properties, we have designed and synthesized the radical dyad 2 which was functionalized with an ethylenedithio (EDT) group in order to improve the intermolecular interactions of the tetrathiafulvalene (TTF) subunits. The physical properties of the new radical dyad 2 were studied in detail in solution to further analyze its electronic structure.
Highlights
During the past few years there has been a growing interest in the development of purely-organic single-component conductors [1,2]
Most neutral radicals behave as a Mott insulator, high conductivity can be attained if the electronic bandwidth W, which is directly related to the intermolecular interactions, is maximized and the intra-site Coulomb repulsion energy U is minimized
We will continue our efforts for crystallizing such compounds that could have a potential use in spintronics if they are able to combine both conductivity and magnetism in a cooperative manner, as the spin-polarized donor radicals reported by Sugawara and coworkers [23]
Summary
During the past few years there has been a growing interest in the development of purely-organic single-component conductors [1,2]. Mori and coworkers have recently reported a purely-organic single-component conductor by utilizing strong hydrogen-bonding interactions between tetrathiafulvalene (TTF)-based electron-donor molecules [10,11] In this direction, we have very recently reported the organic donor-acceptor (D-A) dyad 1 based on the non-planar and spin localized radical perchlorotriphenylmethyl (PTM) radical linked to. As noted previously for similar systems [22], the observation that the intensity of the ESR signal decreases when decreasing the temperature suggests that in the dimer [2+]2 the two TTF+ subunits are magnetically coupled in a singlet (ESR-silent) ground state and, in addition, are able to transmit an antiferromagnetic coupling between the two unpaired spins of the PTM subunits Such behavior indicates that there is a great intermolecular interaction between the dyads 2 which is an important prerequisite for obtaining optimal molecular conductors in the solid state. We will continue our efforts for crystallizing such compounds that could have a potential use in spintronics if they are able to combine both conductivity and magnetism in a cooperative manner, as the spin-polarized donor radicals reported by Sugawara and coworkers [23]
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