title: Silver(I)-Mediated Modification, Dimerization, and Polymerization of an Open-Cage Fullerene.
abstract: The reactions of the open-cage fullerene, MMK-9, with an open 12-membered ring on its surface and silver(I) salts have been examined. The structure of MMK-9 itself has been determined by single-crystal X-ray diffraction. MMK-9 reacts with silver trifluoroacetate in air to form the dimer, {MMK-9(OCH3)5Ag(AgO2CCF3)}2. Remarkably, five MeO groups have added to the surface of the open cage in a pattern that surrounds a pentagon immediately adjacent to the opening in the cage. Dioxygen has been implicated as the oxidant in this unusual addition of five groups to the open cage. Two silver ions connected to each other by a short argentophillic interaction reside at the core of the centrosymmetric dimer. The reaction of silver nitrate with MMK-9 yields the crystalline polymer, [{MMK-9(OCH3)5Ag(AgOCH3)}2·H2O]n. This polymer consists of dimeric {MMK-9(OCH3)5Ag}2units that are connected into strands through silver ions, which are chelated by the amine functions of one open cage and bound in η2-fashion to a pair of carbon atoms on an adjacent open cage.
authors.affiliation: Department of Chemistry, University of California at Davis , One Shields Avenue, Davis, California 95616, United States.
authors.forename: Amineh
authors.initials: A
authors.lastname: Aghabali
authors.affiliation: Department of Chemistry, University of California at Davis , One Shields Avenue, Davis, California 95616, United States.
authors.forename: Sharon
authors.initials: S
authors.lastname: Jun
authors.affiliation: Department of Chemistry, University of California at Davis , One Shields Avenue, Davis, California 95616, United States.
authors.forename: Marilyn M
authors.initials: MM
authors.lastname: Olmstead
authors.affiliation: Department of Chemistry, University of California at Davis , One Shields Avenue, Davis, California 95616, United States.
authors.forename: Alan L
authors.initials: AL
authors.lastname: Balch