In the solid state structure of 1 several short intermolecular N—H N and C—H Cl contacts are identified suggesting the presence of hydrogen bonds. <...> The anionic tris(pyrazolyl)borate (Tp) ligands have been used with success as supporting ligands in the molecular chemistry of the f-block elements, actinides in particular [ 1—7]. <...> These ligands provide an efficient protection of the metallic center and the possibility of tuning the steric and electronic properties of the complexes through the introduction of substituents in the pyrazolyl groups. <...> As a part of our research in this area we decided to study bis(3,5-dimethylpyrazol-1-yl)methane (Bpm*) complexes of uranium, and here we report the crystal structure of [H2C(3,5-Me2pz)(3,5Me2pzH)]2[UCl6] complex (1). <...> The addition of a Bpm* solution [ 11 ] (109 mg, 0.5 mmol) in THF to a UCl4 solution [ 12 ] (200 mg, 0.5 mmol) in the same solvent at room temperature resulted after stirring overnight in a green suspension. <...> After centrifugation and removal of the solvent under vacuum the solid was washed with n-hexane and dried until dryness to give a green solid. <...> Diffraction quality crystals were obtained from a THF/n-hexane solution at –5 C. Crystals of 1 suitable for the X-ray diffraction study were mounted on a loop with protective oil. <...> X-ray data were collected at 150 K on a Bruker APEX II CCD diffractometer using graphite monochromated MoKh radiation (y = 0.71069 Е) at 50 kV and 30 mA. <...> All hydrogen atoms were inserted in idealized positions and allowed to refine riding on the parent carbon atom. <...> The reaction of bis(3,5-dimethylpyrazol-1-yl)methane with UCl4 in THF was studied and led to a product which could not be fully characterized. <...> Nevertheless, green single crystals suitable for X-ray crystallographic studies were obtained from a THF/hexane solution at –5 C. Attempts to synthesize a bis(pyrazolyl)methane complex of uranium(IV) proved to be unsuccessful and resulted in [H2C(3,5-Me2pz)(3,5-Me2pzH)]2[UCl6] complex (1). <...> The [H2C(3,5-Me2pz)(3,5-Me2pzH)]2[UCl6] compound crystallises in the triclinic system, space group P-1, with the asymmetric unit comprising one independent [H2C(3,5-Me2pz) (3,5-Me2pzH)]+ cation located in a general position and a half of the [UCl6 <...>