Novel, highly versatile chelators based on isocarbostyril scaffolds

INOR 281

Michael Seitz, michel-seitz@web.de and Kenneth N. Raymond, raymond@socrates.berkeley.edu. Department of Chemistry, University of California, 507 Latimer Hall, Berkeley, CA 94720-1460
A new class of cyclic, multidentate hydroxamate chelators (HOIQO) has been synthesized based on isocarbostyril. These species are analogs of the successful hydroxypyridonates (HOPO) that have proven to be useful with respect to actinide sequestering, treatment of iron overload, lanthanide luminescence, magnetic resonance imaging, etc. The extendend aromatic core of HOIQO allows for a very straightforward derivatization for a number of purposes, e.g. for attachment of solubilizing groups, fluorophores, biologically relevant fragments. The lanthanide complexes of a number of these ligands have been characterized. The complexes derived from tren-tris(HOIQO) exhibit interesting one-dimensional coordination polymers for all lanthanides. The luminescence properties of the europium(III)- and samarium(III)-complexes have been investigated and show promising results.