Black, air‐stable crystals of the new ruthenate(V) Sr 3 (Ag 2/3 Sr 1/6 )RuO 6 were grown in a silver ampoule using KO 2 as oxidative flux. X‐ray diffraction on single‐crystals revealed a rhombohedral structure with the space group R c . Sr 3 (Ag 2/3 Sr 1/6 )RuO 6 crystallizes isostructural to Sr 4 PtO 6 in the K 4 CdCl 6 structure type. By sharing trigonal faces, alternating [RuO 6 ] octahedra and [(Ag 2/3 Sr 1/6 □ 1/6 )O 6 trigonal prisms form segmented chains running parallel to the crystallographic c‐ axis. Eightfold coordinated strontium cations are located between the rods. Regardless of the wide spatial separation of the magnetic cations (588 and 594 pm), Sr 3 (Ag 2/3 Sr 1/6 )RuO 6 shows long‐range antiferromagnetic order below the relatively high Néel temperature of 79 K in magnetic fields up to at least 9 T, as measurements of the magnetic susceptibility and heat capacity show. Despite the pseudo one‐dimensional character of the structure, the characteristic of the susceptibility indicates a three‐dimensional coupling of magnetic ions.
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Thakur et al. (2024) studied this question.
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