The chevmic properties;al of ac tint a ematerials are oftenen pre n fine 1d described based o nth e datavailablea;for isostructural species. This isfhoasefor potassium,iutonyi(puvi) carbunate'I(4ru o2tco 3 a c relevant'for technologyandthe environment, of walc.tne crystallographic and thermodynamic propertiesof whiCharestilllaco.og.We report hrethesynt and characterization of PU achievedb single x-ray diffiacido3analysisand high-energy-resolution fiiorescence-dc:edXraydbsorptiunnear-edge structure at the M4 edgecoup--dwithelectruntcstructure calculations"The of with isostructural (U) andnePtuniun (Np) compounds.,ctinyIAn axial lengths,hs r0 lv-012+arecorrelatedne'weensciid'4nvto2(CO3)3(cr)' and aqueous, [Af3 2(c03)3] (ac) spec for theuvNv_ptseries.Thespectroscopic data are to Puvo2(c)totackle the trendin atom.