A second generation dendrimer incorporating nine S2N2-donor macrocycles and its palladium(II) complex

A new second generation dendrimer incorporating nine S2N2-donor macrocyclic units that bind nine Pd(II) cations is reported. Interest in the potential applications of nanoscopic structures has fuelled rapid progress in the chemistry of dendrimers and hyperbranched polymers.1 While less studied than purely organic systems, the inclusion of transition metals into such structures is of particular interest as the resulting materials may, for example, display novel magnetic, electronic and/or catalytic properties.2,3 Dendritic structures incorporating macrocyclic ligand units have received less attention.4–7 Recently, we have reported metal binding studies8,9 involving the tri-linked N2S2-donor macrocyclic ligands derived from the common precursor 1.10 We now report an extension of these studies in which the linking of nine such rings in a dendritic architecture has been achieved