Synthesis and crystal structure of (NH4)[Ni3(HAsO4)(AsO4)(OH)2].
Acta Crystallogr E Crystallogr Commun
; 80(Pt 5): 527-531, 2024 Apr 01.
Article
en En
| MEDLINE
| ID: mdl-38721420
ABSTRACT
The title compound, ammonium trinickel(II) hydrogen arsenate arsenate di-hydroxide, was synthesized under hydro-thermal conditions. Its crystal structure is isotypic with that of K[Cu3(HAsO4)(AsO4)(OH)2] and is characterized by pseudo-hexa-gonal (001) 2 ∞[Ni3As2O18/3(OH)6/3O1/1(OH)1/1]- layers formed from vertex- and edge-sharing [NiO4(OH)2] octa-hedra and [AsO3.5(OH)0.5] tetra-hedra as the building units. The hydrogen atom of the OH group shows occupational disorder and was refined with a site occupation factor of 1/2, indicating the equal presence of [HAsO4]2- and [AsO4]3- groups. Strong asymmetric hydrogen bonds between symmetry-related (O,OH) groups of the arsenate units [Oâ¯O = 2.588â
(18)â
Å] as well as hydrogen bonds accepted by these (O,OH) groups from OH groups bonded to the NiII atoms [Oâ¯O = 2.848â
(12)â
Å] link adjacent layers. Additional consolidation of the packing is achieved through N-Hâ¯O hydrogen bonds from the ammonium ion, which is sandwiched between adjacent layers [Nâ¯O = 2.930â
(7)â
Å] although the H atoms could not be located in the present study. The presence of the pseudo-hexa-gonal 2 ∞[Ni3As2O18/3(OH)6/3O1/1(OH)1/1]- layers may be the reason for the systematic threefold twinning of (NH4)[Ni3(HAsO4)(AsO4)(OH)2] crystals. Significant overlaps of the reflections of the respective twin domains complicated the structure solution and refinement.
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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Acta Crystallogr E Crystallogr Commun
Año:
2024
Tipo del documento:
Article
País de afiliación:
Austria
Pais de publicación:
Reino Unido