The 9th IUPAC International Symposium on Macromolecule–Metal Complexes (MMC–9) was held at the Polytechnic University in Brooklyn, NY ; August 19–23,2001. The topics addressed included: – macromolecule–metal complexes in "green Chemistry" – polyelectrolytes and polymer batteries – electronic, magnetic and optical properties of macromolecule–metal complexes – biorelated complexes – physical properties The role of metal ions, complexes and clusters inmacromolecular systems was discussed wherein the polymer systems were either natural or synthetic (organic or inorganic). Plenary and selected lectures are presented in this volume of Macromolecular Symposia. This text is intended for scientists, engineers and other technical personnel who seek a current assessment of the rapidly growing field of macromolecule–metal complexes.