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Dendrimers of Nanometer Size Based on Metal Complexes: Luminescent and Redox‐Active Polynuclear Metal Complexes Containing up to Twenty‐Two Metal Centers
Author(s) -
Campagna Sebastiano,
Denti Gianfranco,
Serroni Scolastica,
Juris Alberto,
Venturi Margherita,
Ricevuto Vittorio,
Balzani Vincenzo
Publication year - 1995
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.19950010404
Subject(s) - dendrimer , metal , luminescence , chemistry , ligand (biochemistry) , supramolecular chemistry , redox , photochemistry , bridging ligand , non innocent ligand , pyrazine , metal ions in aqueous solution , chelation , inorganic chemistry , polymer chemistry , materials science , molecule , stereochemistry , organic chemistry , biochemistry , receptor , optoelectronics
Treelike (dendritic) structures made of Ru II ‐polypyridine complexes have been prepared by the “complexes‐as‐metals and complexes‐as‐ligands” synthetic strategy. The key building blocks are Ru II complexes of the 2,3‐bis‐(2‐pyridyl)pyrazine(2,3‐dpp) bridging ligand, where one of the two chelating sites can be protected by methylation. Dendrimers containing four, ten, and twenty‐two metal ions have been obtained. These dendrimers exhibit strong absorption in the UV/Vis spectral region, a moderately strong red luminescence, and a great number of metal‐based oxidation and ligand‐based reduction processes. The nature of the terminal ligands determines in which subunits of the supramolecular array the HOMO and LUMO orbitals and the luminescent excited state are localized. The reported synthetic strategy is efficient, characterized by a full, step‐by‐step control of the growth process, and can be easily extended to building blocks containing other metals and/or ligands.