title: Spectroscopic studies on inclusion properties of fullerenocalix[4]arene conjugates with metal ions.
abstract: Metal-chelating properties-in the ground and excited states-of fullerenocalix[4]arenes containing two malonamide substituents at the upper rim and four alkyl ester chains at the lower rim have been studied by means of steady-state absorption, fluorescence spectroscopy, and time-resolved transient absorption spectra. In particular, the influence that Ag+ enforces on the fullerene electronic spectra is due to direct interactions between Ag+ and the surface of C60. The effects stemming from Na+, Mg2+, and Ba2+, on the other hand, are indirect and are introduced through chelating the metal ions to the calix[4]arene moiety. They strongly depend on the molecular structure of the fullerenocalix[4]arenes. No spectroscopic evidence was obtained for any influence caused by Mn2+, although the malonamide groups provide good chelating ability even for this transition metal ion.
authors.affiliation: Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, USA. cl43@georgetown.edu
authors.forename: Chuping
authors.initials: C
authors.lastname: Luo
authors.forename: Dirk M
authors.initials: DM
authors.lastname: Guldi
authors.forename: Antonio
authors.initials: A
authors.lastname: Soi
authors.forename: Andreas
authors.initials: A
authors.lastname: Hirsch