The uranium(IV)/uranium(IV) 渭-sulfide complex [{((AdArO)3N)U}2(渭-S)] reacts with CS2 to form the trithiocarbonate-bridged complex [{((AdArO)3N)U}2(渭-魏2:魏2-CS3)]. The trithiocarbonate complex can alternatively be formed in low yields from low-valent [((AdArO)3N)U(DME)] through the reductive cleavage of CS2.