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Sodium sulfite heptahydrate and its relation to sodium carbonate heptahydrate
Author(s) -
Weil Matthias,
Mereiter Kurt
Publication year - 2020
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229620004404
Subject(s) - crystallography , monoclinic crystal system , hydrogen bond , cationic polymerization , orthorhombic crystal system , octahedron , chemistry , stacking , acceptor , sulfite , crystal structure , inorganic chemistry , molecule , polymer chemistry , organic chemistry , physics , condensed matter physics
The monoclinic crystal structure of Na 2 SO 3 (H 2 O) 7 is characterized by an alternating stacking of (100) cationic sodium–water layers and anionic sulfite layers along [100]. The cationic layers are made up from two types of [Na(H 2 O) 6 ] octahedra that form linear 1 ∞ [Na(H 2 O) 4/2 (H 2 O) 2/1 ] chains linked by dimeric [Na(H 2 O) 2/2 (H 2 O) 4/1 ] 2 units on both sides of the chains. The isolated trigonal–pyramidal sulfite anions are connected to the cationic layers through an intricate network of O—H…O hydrogen bonds, together with a remarkable O—H…S hydrogen bond, with an O…S donor–acceptor distance of 3.2582 (6) Å, which is about 0.05 Å shorter than the average for O—H…S hydrogen bonds in thiosalt hydrates and organic sulfur compounds of the type Y —S— Z ( Y / Z = C, N, O or S). Structural relationships between monoclinic Na 2 SO 3 (H 2 O) 7 and orthorhombic Na 2 CO 3 (H 2 O) 7 are discussed in detail.