Organització de tetratiafulvalens en monocapes i fils
- Autores: José Puigmarti Luis
- Directores de la Tesis: David Brian Amabilino (dir. tes.), Luis Bourdelande Jose (codir. tes.)
- Lectura: En la Universitat Autònoma de Barcelona ( España ) en 2008
- Idioma: español
- Tribunal Calificador de la Tesis: Antonio Oliva Cuyàs (presid.), Rosa María Ortuño Mingarro (secret.), Fausto Sanz Carrasco (voc.), Mogens Bronset Nielsen (voc.), Carmen Ocal Garcia (voc.)
- Materias:
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- Resumen
The self-assembly of nanoscopic fibres and rods is an appealing pursuit given that they may form part of molecular electronic devices. This bottom-up approach to wires offers many advantages over strictly covalent approaches, but one limiting factor is control over the self-assembly process. In particular, deposition on surfaces can be difficult to control, and different morphologies and size distributions are common. In this sense, a delicate balance between building block functionality and supramolecular synthons is required. Apart from the supramolecular design built into the components of these nanometre scale objects, the importance of the deposition method, the solution nature and concentration, the chain-length dependence, and the nature of the surfaces on the characteristics of aggregates must be considered.
In present work we want to create nanoscopic conducting fibres in a controllable way by using the tetrathiafulvalene (TTF) as a functional unit. Many studies show stacks of TTF in the solid state, where in their doped form exhibit electrical conductivity. Moreover, TTFs can also form functional stacks as a soft material by controlling the hydrophobic interactions in regions of their molecular structure, through stacking interactions, or even by formation of Langmuir layers. Nevertheless, these -electron-rich units stack flat on graphite in the absence of a specially designed deposition technique or in abeyance of a driving intermolecular interaction which can rearrange the functional part in the proper and functional way. To overcome this issue, in this work, amide functional groups have been introduced in their structure. Molecular modelling provides evidence of the importance of both - interactions and hydrogen bonding in the formation of stacks. The creation of one-dimensional assemblies is available when both interactions are operative. In addition the transfer integral for the HOMO, which is related to the capacity for hole transport, and for th
