Single crystals of new (Cr₂O7)²- and/or (CrO₄)²- containing uranyl compounds with K and Li were prepared by two various synthesis routes

Uranyl chromate-dichromate compound with K demonstrates unique host-guest structural architecture

Structure can be described as incorporation of [(UO₂)(CrO₄)₄]⁶- clusters into the K₂Cr₂O₇ matrix that induces modification of the latter

Li uranyl chromate architecture is typical for uranyl oxysalts with [Li₂(H₂O)₅]²+ tetramers guest species