New hydrated phases of potassium orthovanadate: K 3 (VO 4 )(H 2 O) 0.56 and K 3 (VO 4 )(H 2 O) 4
Year: 2025
Type: article
Abstract: Single crystals of the hydrated potassium orthovanadate phases K 3 (VO 4 )·0.56H 2 O, tripotassium orthovanadate 0.56-hydrate, and K 3 (VO 4 )·4H 2 O, tripotassium orthovanadate tetrahydrate, were isolated during the processing of products obtained under hydroflux conditions. The asymmetric unit of K 3 (VO 4 )(H 2 O) 0.56 (space group P 1 , Z = 12) comprises six formula units of K 3 (VO 4 ) and five water molecules of crystallization. The complex crystal structure is made up of isolated [VO 4 ] 3– tetrahedra connected via K + cations exhibiting coordination numbers between 6 and 8. The structure is consolidated by the formation of a finite hydrogen-bonded network between the water molecules and [VO 4 ] 3– tetrahedra. Two of the K + cations are positionally disordered, and three of the water molecules of crystallization are occupationally and/or positionally disordered. The asymmetric unit of K 3 (VO 4 )(H 2 O) 4 (space group Pmn 2 1 , Z = 2) comprises two K + cations, one V V atom, three O atoms and two water molecules. The crystal structure is also made up from isolated [VO 4 ] 3– tetrahedra interlinked by K + cations (coordination numbers 7 and 8). In comparison with the less-hydrated phase, the higher water content of this compound results in an infinite network of O—H...O hydrogen bonds between the water molecules and [VO 4 ] 3– tetrahedra.
Authors: Tobias Wolflehner, Matthias Weil
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $500
OpenAlex ID: W4414974590
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