title: Use of calix[4]arenes in the redox chemistry of lanthanides: the reduction of dinitrogen by a calix[4]arene-samarium complex.
abstract: The synthesis and structural characterization of a samarium-dinitrogen complex supported by a calix[4]arene ligand in which the N-N bond distance has been stretched to 1.611(16) Angstrom are described. The central mu(3)-eta(2):eta(2):eta(2)-hydrazido tetraanion formed is bonded to three Sm(III) centers with an overall butterfly-type arrangement.
authors.affiliation: Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, BCH-LCIB, CH-1015 Lausanne, Switzerland. geoffroy.guillemot@univ-paris5.fr
authors.forename: Geoffroy
authors.initials: G
authors.lastname: Guillemot
authors.forename: Barbara
authors.initials: B
authors.lastname: Castellano
authors.forename: Thierry
authors.initials: T
authors.lastname: Prangé
authors.forename: Euro
authors.initials: E
authors.lastname: Solari
authors.forename: Carlo
authors.initials: C
authors.lastname: Floriani
mesh_terms: D047250:Calixarenes / Q000737:chemistry*; D028581:Lanthanoid Series Elements / Q000737:chemistry; D015394:Molecular Structure; D009584:Nitrogen / Q000737:chemistry*; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry*; D012493:Samarium / Q000737:chemistry*
chemical_list: D028581:Lanthanoid Series Elements; D010636:Phenols; C121325:calix(4)arene; D047250:Calixarenes; D012493:Samarium; D009584:Nitrogen