Self-assembled mono- and multilayers on gold from 1,4-diisocyanobenzene and ruthenium phthalocyanine

Self-assembled monolayers of 1,4-diisocyanobenzene on gold were used to bin d ruthenium phthalocyanines to the surface by axial ligation of the macrocy cle with isocyanide groups pointing out from the SAM. The 1,4-diisocyanoben zene SAM and the RuPc-1,4-diisocyanobenzene bilayer were characterized by e llipsometry, IRRAS, XPS, and SPM. The grafting of RuPc to the SAM is stable . The thickness of the film increases from 10 to 15 Angstrom upon RuPc liga tion. IRRAS reveals that both ends of the 1,4-diisocyanobenzene are affecte d by the N=C to metal interaction occurring at the other end. XPS indicates that each RuPc macrocycle covers similar to 12 1,4-diisocyanobenzene molec ules in the bilayer.