title: The first urea azine molecule and its coordination to uranium in the first actinide guanidinate complexes.
abstract: The urea azine molecule (CyNH)(2)C=N-N=C(HNCy)(2) (1) was easily prepared by reaction of the carbodiimide CyN=C=NCy and H(2)NNH(2) and this novel type of bis-guanidine proved useful in affording chelating and bridging ligands for the building of polynuclear compounds, as illustrated by the synthesis of the first uranium guanidinate complexes [(THF)(2)Li(mu-Cl)(2)UCl(mu-L)](2) (2) and [UCl(mu-L)(2)UCl(2)(micro-Cl)(2)UCl(mu-L)](2) (3) (L = - 2H); the X-ray crystal structures of compounds - were determined.
authors.affiliation: Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, Laboratoire Claude Fréjacques, CEA Saclay, Bâtiment 125, 91191, Gif-sur-Yvette, France. claude.villiers@cea.fr
authors.forename: Claude
authors.initials: C
authors.lastname: Villiers
authors.forename: Pierre
authors.initials: P
authors.lastname: Thuéry
authors.forename: Michel
authors.initials: M
authors.lastname: Ephritikhine