Reactions of organouranium compounds with tetracyanoethylene and 7,7,8,8-tetracyanoquinodimethane

Various organouranium(IV) complexes of the general type Cp3UX (Cp =?5 -C5H5; X= Cl, CH3, n-C4H9 and C6H5) react in toluene solution with tetracyanoethylene and even with 7,7,8,8-tetracyanoquinodimethane to give new triscyclopentadienyluranium keteniminates. Their NIR-Vis spectra seem to be typical of U(IV) compounds with trigonal bipyramidal coordination around the metal.