The novel and exciting field of molecular spintronics has recently attracted a great deal of interest and promising results have already been reported. The utilisation of organic radicals that could favour spin polarisation and conservation during transport offers new possibilities; however, first a fundamental investigation of these materials, especially those deposited on surfaces, is required. Here we highlight our recent results regarding the functionalisation of surfaces with polychlorotriphenylmethyl (PTM) radicals following five different strategies in which interactions of different nature are involved (i.e. van der Waals, electrostatic, coordination bond and covalent bond). In all cases, it was proved that the magnetic character of the molecule persists on the surface.

We report on the fabrication and characterization of field-effect transistors based on single crystals of the organic semiconductor dibenzo-tetrathiafulvalene (DB-TTF). We demonstrate that it is possible to prepare very-good-quality DB-TTF crystals from solution. These devices show high field-effect mobilities typically in the range $0.1–1{\mathrm{cm}}^2∕\mathrm{V}\mathrm{s}$ . The temperature dependence was also studied revealing an initial increase of the mobility when lowering the temperature until it reached a maximum, after which the mobility decreased following a thermally activated behavior with activation energies between 50 and $60\mathrm{meV}$ . Calculations of the molecular reorganization energy and intermolecular transfer integrals for this material were also performed and are in agreement with the high mobility observed in this material.