Investigation of the Electronic, Photosubstitution, Redox, and Surface Properties of New Ruthenium(II)-Containing Amphiphiles

A series of pyridine- and phenol-based ruthenium(II)-containing amphiphiles with bidentate ligands of the following types are reported: [(LPyI)RuII(bpy)2](PF6)2 (1), [(LPyA)RuII(bpy)2](PF6)2 (2), [(LPhBuI)RuII(bpy)2](PF6) (3), and [(LPhClI)RuII(bpy)2](PF6) (4). Species 1 and 2 are obtained by treatment of [Ru(bpy)2Cl2] with the ligands LPyI (N-(pyridine-2-ylmethylene)octadecan-1-amine) and LPyA (N-(pyridine-2-ylmethyl)octadecan-1-amine). The imine species 3 and 4 are synthesized by reaction of [Ru(bpy)2(CF3SO3)2] with the amine ligands HLPhBuA (2,4-di-tert-butyl-6-((octadecylamino)methyl)phenol), and HLPhClA (2,4-dichloro-6-((octadecylamino)methyl)phenol). Compounds 1−4 are characterized by means of electrospray ionization (ESI+) mass spectrometry, elemental analyses, as well as electrochemical methods, infrared and UV−visible absorption and emission spectroscopies. The cyclic voltammograms (CVs) of 1−2 are marked by two successive processes around −1.78 and −2.27 V versus Fc+/Fc attributed to bipyridine ...