Isolation, reactions and x-ray structure of tetraethylammonium dihydridotetracarbonylrhenate

The isolation and characterization of the novel hydridic compound [Net4][H2Re(CO)4], obtained from the reaction of Re2(CO)10 with methanolic KOH, are described. Its reactions with I2, strong acids, and ethanol are reported. The salt gives triclinic crystals, investigated by X-ray analysis, with cell constants a = 14.493(6), b = 7.564(3), c = 7.930(3) Å, α = 72.97(4)°, β = 81,73(4)°, γ = 96.63(4)°; space group P1. The structure was solved by conventional Patterson and Fourier methods and refined by least-squares up to a final R values of 0.071, for 1586 independent counter data. The anion exhibits a distorted octahedral geometry, with the two hydrido ligands in cis position between themselves. The mean values of the ReC and CO distances are 1.89 and 1.21 Å. The carbonyl groups are significantly bent towards the hydrido ligands. © 1978.