| Resumo: | D. A. and F. F. S. acknowledge the Portuguese Foundation for Science and Technology (FCT-MEC) for a post-graduate Grant No. SFRH/BD/61645/2009 and post-doctoral Grant No. SFRH/BPD/68979/2010, respectively. We also acknowledge partial funding from the Portuguese research Grant No. PEst-OE/FIS/UI0068/2011 through FCT-MEC, and from the Spanish Ministerio de Economia y Competitividad (Project No. FIS 2009-10245). Some of this work forms part of the EU/ESF COST Actions Nano-IBCT-MP1002 and The Chemical Cosmos-CM0805. The authors are extremely grateful to Professor Eugen Illenberger from the Free University Berlin, Germany, for fruitful and lively discussions.
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