Redetermination of Sr(2)PdO(3) from single-crystal X-ray data.

The crystal structure redetermination of Sr(2)PdO(3) (distrontium palladium trioxide) was carried out using high-quality single-crystal X-ray data. The Sr(2)PdO(3) structure has been described previously in at least three reports [Wasel-Nielen & Hoppe (1970 ▸). Z. Anorg. Allg. Chem. 375, 209-213; Muller & Roy (1971 ▸). Adv. Chem. Ser. 98, 28-38; Nagata et al. (2002 ▸). J. Alloys Compd. 346, 50-56], all based on powder X-ray diffraction data. The current structure refinement of Sr(2)PdO(3), as compared to previous powder data refinements, leads to more precise cell parameters and fractional coordinates, together with anisotropic displacement parameters for all sites. The compound is confirmed to have the ortho-rhom-bic Sr(2)CuO(3) structure type (space group Immm) as reported previously. The structure consists of infinite chains of corner-sharing PdO(4) plaquettes inter-spersed by Sr(II) atoms. A brief comparison of Sr(2)PdO(3) with the related K(2)NiF(4) structure type is given.