**7. Acknowledgments**

This work was made possible through a financial support from La Sapienza University. F.D.P. wishes to acknowledge the Ministry of Education for financing her stay in Barcelona, where she completed the characterization of the above mixtures.

Financial support from MICIN CTQ2010-14897, Generalitat de Catalunya, through the 2009SGR1331 grant and COST Action Project on Chemistry at Interfaces, D36, are gratefully acknowledged.

Thanks to A. Scipioni, Dept. of Chemistry at La Sapienza, for help in performing *CD* spectra, and for fruitful discussions on some aspects of the manuscript. Thanks also to G. Risuleo, Dept. of Molecular Biology at La Sapienza, for suggestions on the biological implications of these systems.
