Abstracts 2000

Abstract of Publication No. 357

Andreas Loosli, Markus Wermuth and Hans-Ueli Güdel, Silvia Capelli, Jürg Hauser and Hans-Beat Bürgi
Crystal Structure and Optical Spectroscopy of Er2[Pt(CN)4]3·21H2O and Er2[Pt(CN)4]2·SO4·11.5H2O
Inorg. Chem. 39, 2289-2293 (2000)      Full Text (PDF)      DOI-Link      Crystal Structure Data (CIF format)     

Abstract: We have synthesized two forms of erbium tetracyanoplatinates, Er2[Pt(CN)4]3·21H2O (red form) and Er2[Pt(CN)4]2·SO4·11.5H2O (yellow form), and determined their crystal structures by X-ray diffraction. While the red form crystallizes in the orthorhombic space group Pbcn, with a = 15.4848(3) , b = 13.8186(2) , c = 19.07820(10) , a = b = g = 90, and Z = 4, the yellow form precipitates in the tetragonal space group I4cm, with a = b = 14.321(2) , c = 13.338(3) , a = b = g = 90, and Z = 4. Both forms show [Pt(CN)4]2- chains but differ markedly in color and morphology. This is due to the incorporation of sulfate ions in the latter modification, leading to an increased Pt-Pt distance. The observed optical absorption and emission behavior of the title compounds is correlated with the Pt-Pt distances.

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