Guanidinium hydrogen selenate
โ Scribed by Fleck, Michel
- Publisher
- International Union of Crystallography
- Year
- 2006
- Tongue
- English
- Weight
- 230 KB
- Volume
- 62
- Category
- Article
- ISSN
- 1600-5368
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โฆ Synopsis
Guanidinium hydrogen selenate, CH 7 N 3 O 4 Se or [C(NH 2 ) 3 ] + ร-(HSeO 4 ) ร , is isotypic with its sulfate analogue. The atomic arrangement is characterized by hydrogen selenate tetrahedra and trigonal guanidinium groups, which are connected to each other by a network of mostly weak hydrogen bonds. All atoms are located on general positions.
๐ SIMILAR VOLUMES
## ร-C 2 HO 4 ร , each cation is linked to four adjacent anions by intermolecular N-Hร ร รO hydrogen bonds [Nร ร รO = 2.870 (4)-2.895 (4) A ห], and each anion is also linked to two adjacent anions by O-Hร ร รO hydrogen bonds [Oร ร รO = 2.526 (3) A ห] to form a two-dimensional grid network parallel
All three compounds have in common a coordination number of cesium of 10 or 10ุ1, with Cs-O distances from 2.9 to 3.8 A s . P and Se atoms form the individual tetrahedra with different H-bonding connectivity in structures I-III. PO 4 -SeO 4 layers with attached SeO 4 groups are present in I. Structu
The phase equilibrium in the systems Na,SeO, -CuSeO, -H,O and Na,SeO, -ZnSeO, -H,O were studied and it was established that new phases were obtained -double salts with a cornposition: Na2Cu(Se0,), . 2 H,O and Na,Zn(SeO,), ' 2 H20. The fields of phase equilibrium of the double salts in the triple sys