Abstract
Red crystals of Na2SnSe3 were synthesized by a fusion reaction of Na2Se, Sn, and Se. Na2SnSe3, oP 144, is orthorhombic, space group Pnma, with a = 13.975(4) Å, b = 23.680(6) Å, c = 12.519(3) Å Z = 24. The crystal structure was determined from diffractometer data (AgKα) and refined to a conventional R of 0.051 for 2201 reflections with |F0|2 > 3 σ(|F0|2) and 190 refined variables. The crystal structure is characterized by infinite anionic chains, 1∞ -[SnSe3]2-, formed by distorted apex sharing tetrahedra running along [010]. The translation period comprises six tetrahedra. Sn-Se bond lengths are in the range 2.457-2.601 Å with an average of 2.527 Å. Na+-ions are arranged on corrugated layers perpendicular to [010]. They are coordinated to 5-6 chalcogen atoms in irregular configurations.
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