Routes to Metallodendrimers: Synthesis of Isomeric Neutral Metallomacromolecules Based on Bis(2,2′:6′,2″‐terpyridine)ruthenium(II) Connectivity

Abstract

Routes for the syntheses of isomeric, zwitterionic, bisterpyridine–Ru^II-based macromolecules are described. Access to these novel architectures is facilitated by the construction of terpyridine-modified, 1→3 C-branched, ester-terminated building blocks. Constitutional isomers result from the interchangable placement of methyl and tert-butyl ester groups on both the branched framework near the Ru^II centers and the termini of the branched construct. Water solubility is imparted to each isomer through selective transformation of the tert-butyl esters to their corresponding carboxylates. Along with the standard characterization techniques, electrochemical and spectroscopic data also support the structural formation.