ChemInform Abstract: ZUSTANDSDIAGRAMME DER SYSTEME SR‐SE UND SR‐TE

Abstract

Im System Sr‐Se bilden sich die kongruent bei 1600°C schmelzende Verbindung SrSe sowie durch peritektische Reaktionen die Verbindungen Sr2Se3, SrSe2 und SrSe3.

Synthesis, crystal and electronic structure, and optical properties of two new chalcogenide-iodides: Ba3Q4I2 (Q = S, Se)

“…The Se-Se bonds in the Se 2 2− dimers, 2.384(3) and 2.394(3) Å, are much longer than the S-S bonds. These distances are close to the sum of the corresponding Pauling radius of Se (1.20 Å) 23 and comparable to Se-Se distances in elemental selenium and other reported compounds: 2.45 Å in Se 1 , 29 2.36 Å in Se 6 , 30 32 The Ba-Se distances in Ba 3 Se 4 I 2 , 3.22-3.35 Å, are similar to the distances in various Ba selenides, such as 3.29 Å in BaSe, 33 3.30-3.56 Å in Ba 2 Sb 2 Se 5 , 34 3.29-3.41 Å in Ba 4 Sb 4 Se 11 , 32 and 3.26-3.60 Å in BaSb 2 Se 4 . 35 The Ba-I distances in Ba 3 Se 4 I 2 , 3.51-3.77 Å, are longer than those in Ba 3 S 4 I 2 , but are comparable to distances found in Ba 3 SiI 2 (3.54-3.81 Å), 36 Ba 3 GeI 2 (3.55-3.81 Å), 36 and Ba 4 Fe 2 S 4 I 5 (3.51-3.73 Å).…”

“…S2 †). These distances are close to the sum of the corresponding Pauling radius of Se (1.20 Å) 23 33 3.30-3.56 Å in Ba 2 Sb 2 Se 5 , 34 3.29-3.41 Å in Ba 4 Sb 4 Se 11 , 32 and 3.26-3.60 Å in BaSb 2 Se 4 . 27 The Ba-S distances in Ba 3 S 4 I 2 (3.11-3.28 Å) are similar to the distances found in Ba 3 Sb 2 S 7 (3.14-3.35 Å), 26 BaSb 2 S 4 (3.13-3.35 Å), 28 and Ba 4 Fe 2 S 4 I 5 (3.20-3.30 Å).…”