Crystal Structure and Entropy of Sodium Sulfate Decahydrate

Abstract

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An X-ray diffraction study of sodium thiosulphate pentahydrate, Na2S2O3.5H2O

“…Such edge-sharing octahedral columns are found in the structures of other hydrated Na salts, e.g. sodium sulphate decahydrate (Ruben, Templeton, Rosenstein & Olovsson, 1961), borax (Na2B4-O7.10H20, Morimoto, 1956), and sodium chlorite trihydrate (Tarimci, Schempp & Chang, 1975). Average Na--O distances in these structures are 2.43, 2.42 and 2.409 (1) /~, respectively.…”

Low-temperature thermal properties of 2,2-dimethyl-1,3-propanediol and its deuterated analogues

“…This was hinted at by the explanation of residual entropy of Na 2 SO 4 · 10H 2 O(cr). (6) In this hydrated crystal, (7) a four-membered hydrogen-bonded ring is formed by water molecules per formula unit. There are two possible ways of arranging the hydrogen atoms in each ring, either clockwise or anti-clockwise with respect to the donor-acceptor relation of neighbouring oxygen atoms.…”

Polymeric anhydrous sodium 2-aminobenzensulfonate

“…However, irrespective of structure type, because sodium has relatively good af®nity for oxygen, the coordination about the metal centres is usually quite regular, with stereochemistry similar to transition metal complexes, e.g. the common NaÐ O 6 octahedral (or distorted octahedral) six-coordination found in the structures of Na 2 SO 4 Á10H 2 O (Ruben et al, 1961;Levy & Lisensky, 1978) and NaClO 4 Á3(dioxane) (Barnes & Weakley, 1978) is also found in sodium hydrogen (+)-tartrate (Bott et al, 1994). As with the transition metal complexes, the metal stereochemistry is often forced by the constraints of the ligand, e.g.…”