Early explanations for the deep red color of the salt were attributed to the special structure of the crystal lattice, albeit with little explanation. While Drew & Tess attempted to explain the deep color of this compound based on the assumption of a Pt(III) species, Jensen established the diamagnetism of the compound and proved that it did not involve Pt(III). Spectrochemical studies on the compound crystals concluded that the deep color of Wolffram’s salt crystals is due to the stacking of the “infinite chains” - linear Pt(II)/Pt(IV) stacked on top of each other.
In 1960, the crystal structure was shown to be consistent with the formulated double salt, inspiring examinations of other analogues to compare and better understand this unique coordination pattern.
Solid-state physical examinations were conducted to further elucidate the charge transfer across the mixed valence chain and potentially find use as semiconductors. X-ray scattering studies were performed, explicitly showing the mixed valence chain structure. Optical properties were probed, as well as potential use as a photocatalyst, albeit with disappointing results.