Origins of the odd optical observables in plutonium and americium tungstates† †Electronic supplementary information (ESI) available. CCDC 1902033–1902039. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c9sc01174a

A series of f-block tungstates show atypical coloration for both the Ce(iii) and Pu(iii) compounds; whereas the other lanthanide and Am(iii) compounds possess normal absorption features. The different optical properties are actually derived from the tungstate component rather than from 5f electrons/orbitals.

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