A series of plutonium(VI) oxalates were synthesized. Electronic absorp
tion spectra of these compounds in the crystalline state were recorded
. The plutonium(VI) oxalates are isostructural with the similar uranyl
compounds. Based on this fact, some relations between the structure o
f plutonium(VI) oxalates and their absorption spectra were revealed. T
he data on thermal behavior of simple plutonyl oxalate were refined.