1. Institute for
Organic Synthesis and Photoreactivity, National Research Council, via P. Gobetti,
101, 40129 Bologna, Italy
2. Department
of Theoretical and Applied Sciences, University of Insubria, via J.H.
Dunant 3, 21100 Varese, Italy
3. Institute for Microelectronics
and Microsystems, National Research Council, via P. Gobetti, 101, 40129 Bologna, Italy