Synthesis and crystal structure of triethylammonium hexabromidouranate(IV) dichloromethane monosolvate

Abstract

Triethylammonium hexabromidouranate(IV) dichloromethane monosolvate, [(C2H5)3NH]2[UBr6]·CH2Cl2, was obtained in the form of dark-brown crystals from the reaction of uranium pentabromide with NEt3 and ethylene glycol in dichloromethane at low temperature. During the progress of the reaction, the reduction of uranium(V) to uranium(IV) was observed, whose associated oxidation product could not be identified. The uranium atom of the [UBr6]2– anion is coordinated by six bromido ligands in the shape of an octahedron. Between cations, anion and solvent molecules of crystallization, numerous C—H...Hal hydrogen-bond-like interactions are present, leading to a three-dimensional network structure.

Keywords

• crystal structure
• uranium
• bromide
• triethylamine