Thermal decomposition of U(BH4)4

Synthesis, Structure, and Reactions of Hydride, Borohydride, and Aluminohydride Compounds of the f-Elements

“…Thermal or photochemical decomposition of U(BH 4 ) 4 led to the formation of U(BH 4 ) 3 , according to eq 38. ,− …”

“…179 Thermal or photochemical decomposition of U(BH 4 ) 4 led to the formation of U(BH 4 ) 3 , according to eq 38. 145,[180][181][182] The complexes U(BH 4 ) 3 (PEt 3 ) 2 and U(BH 4 ) 3 (PEt 2 -Ph) 2 were synthesized by reducing U(BH 4 ) 4 in the presence of the phosphine; their structure was not determined with precision. 183 The diphosphine compound U(BH 3 Me) 4 (DMPE) was heated in toluene in the presence of DMPE to give the U(III) derivative U(BH 3 Me) 3 (DMPE) 2 ; the pentagonal-bipyramidal crystal structure showed that the three BH 3 Me ligands are tridentate (Figure 56).…”

Uranium–hydrogen interactions: synthesis and crystal structures of tris(N,N-dimethylaminodiboranato)uranium(iii)

“…The homoleptic U III complex U(BH 3 ) 3 has not been fully characterized even though it is the suspected product from the thermal decomposition of U(BH 4 ) 4 . 7,10,11 As part of our effort to explore the remarkable chemistry of the N,N-dimethylaminodiboranato (DMADB) ligand, [12][13][14] we now report the synthesis of the new complex tris(N,Ndimethylaminodiboranato)uranium(III). Its structure is the first of a molecular uranium(III) complex in which the coordination sphere of the uranium center consists entirely of hydrogen atoms.…”

Metal Borohydrides beyond Groups I and II: A Review

“…U(BH 4 ) 4 , being volatile at room temperature, can be collected in a cold tramp and also purified in this way [81]. U(BH 4 ) 4 forms lustrous dark-green crystals; it is polymeric in the solid-state and monomeric in the gas phase [228] (111) Decomposition kinetics was of first-order between 403 and 443 K and of second-order between 373 and 393 K [229].…”

“…The optical spectrum of U(BH 4 ) 4 can be revised at[223,227] and, relatively recently, the f-orbital covalency in U(BH 4 ) 4 was demonstrated[87]. U(BH 4 ) 4 is fairly stable at room temperature[229], but can decompose upon the action of ultraviolet photons of 253.5 nm (4.8 eV) at 295 K, with B 2 H…”