부산대학교 도서관

The properties of molecular and hybrid nanostructures on surfaces are strongly in uenced by intermolecular and molecule-surface interactions. This thesis contributes to a deeper understanding of the role they play in the formation of molecular complexes focusing on the structural, electronic and catalytic properties of the resulting nanostructures. By means of Variable Temperature Scanning Tunneling Microscopy and X-ray Photoemission Spectroscopy, we have conducted experiments in three di erent eld of surface science. In the rst part, it will be studied distinct supramolecular structures obtained by intermixing of organic acceptor molecule, with two di erent nature donor species: one organic molecules and one metallic element. A dissertation on supramolecular self-assembly, coordination networks and charge transfer complexes on a noble metal surface will be exposed. Then, will be discussed and analyzed the results obtains on the heteroepitaxial growth of metals. It will be studied the mechanisms underlying the growth as well the thermodynamical and kinetic aspects that influence it. On the other hand we observe a modi cation of the metal growth behavior in presence of a pre-adsorbed molecular layer, which play an active role in the process. Last experiments involve the chemical reactions of organic molecules using the surface itself as a catalyst. The organic surface chemistry represents an innovative method to obtain large organic molecules covalently connected each other via bottom-up approach. Such structures present several advantages with respect to the weak-bond supramolecular strucutes held together by no-covalent forces.
Las propiedades de nano estructuras moleculares y hibridas est an fuertemente afectadas por interacciones intermoleculares y interacciones mol eculas substrato. Esta tesis contribuye a un m as profundo conocimiento del papel jugado de dichas interacciones en la formaci on de complejos moleculares, enfocándose en las propiedades estruct urales, electronicas y catalticas de las nanoestructuras as formadas. Mediante Variable Temperature Scanning Tunneling Microscopy and X-ray Photoemission Spectroscopy, hemos llevado al cabo experimentos sobre tres distintos campos de investigaci on de la ciencia de las superficies. En la primer parte, se estudiar a diferentes estructuras supramoleculares obtenidas mesclando una mol ecula org anica aceptora de electrones con dos especies donoras de distintas natura: una es otra mol ecula org anica, la otra es un elemento met alico. Una disertaci on sobre el autoensamblaje supramolecular, redes de coordinaci on y complejos de transferencia de carga estar a bien discutida. Luego se discutir an y analizar an los resultados obtenidos en el crecimiento heteroepitaxial de los metales. Se estudiar an adem as los mecanismos por debajo del crecimiento y los aspectos termodin amicos y cin eticos que influyen en las modalidades de crecimiento. Los ultimos experimentos involucran las reacciones qu micas se mol eculas org anicas usando la super cie misma como catalizador. La qu mica org anica en super cies representa un nuevo y innovador m etodo para obtener grandes mol aculas covalentemente enlazadas entre s mismas con estrategia bottom-up. Estas estructuras presentan muchas ventajas con respecto a las estructuras supramolecular estabilizadas con d ebiles fuerzas no covalentes.