An unprecedented structural phase transition in struvite-type compounds: dimorphism of KMgAsO4(H2O)6
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Matthias Weil
Abstract
The crystal structure of struvite-type KMgAsO4(H2O)6 has been redetermined from single crystal X-ray diffraction data at room temperature. The previous structure model based on powder X-ray diffraction data was confirmed with higher precision and accuracy and with all hydrogen atoms located. KMgAsO4(H2O)6 undergoes a reversible phase transition of the continuous type at 263(2) K, changing the symmetry from orthorhombic to monoclinic. The corresponding Pnm21→P1121 symmetry reduction is of a translationengleiche type with index 2 and was monitored by temperature-dependent powder X-ray diffraction measurements. Such a phase transition is unprecedented for struvite-type compounds. The crystal structure of the monoclinic polymorph was determined from a two-domain crystal at 100 K. Except for the motion of one of the water molecules towards stronger hydrogen-bonding interactions, structural changes between the two polymorphs are small.
Dedicated to: Professor Wolfgang Bensch on the occasion of his 65th birthday.
Acknowledgment
The X-ray Centre of TU Wien is acknowledged for providing access to the X-ray diffractometers.
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©2019 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- In this Issue
- Preface
- Congratulations to Professor Wolfgang Bensch on the occasion of his 65th birthday
- Orthorhombic sulfur from Cap Garonne, Mine du Pradet
- An unprecedented structural phase transition in struvite-type compounds: dimorphism of KMgAsO4(H2O)6
- ZrNiAl-type gallides with pronounced metal-metal bonding, and the dimorphism of ScPdGa
- Tripodal methanetrisulfonate ligands in the trinuclear complex {Ni3[CH(SO3)3]2(NMP)8}
- Crystal structure of the high-temperature form of the trisulfide Cs2S3 and the (3+1)D modulated structure of the telluride K37Te28
- Synthesis, crystal structure and properties of Cd(NCS)2 coordination compounds with two different Cd coordination modes
- Crystalline orthorhombic Ln[CO3][OH] (Ln=La, Pr, Nd, Sm, Eu, Gd) compounds hydrothermally synthesised with CO2 from air as carbonate source
- The role of synthesis conditions for structural defects and lattice strain in β-TaON and their effect on photo- and photoelectrocatalysis
- Determination of the charge of Al13 Keggin oligocations intercalated into synthetic hectorite
- Electronic and magnetic properties of the 2H-NbS2 intercalated by 3d transition metal atoms
- CsTb3STe4 und CsTb5S2Te6: Zwei pseudo-ternäre Caesium-Terbium-Chalkogenide mit geordneten S2−- und Te2−-Anionen
- Synthesis, molecular, and crystal structures of 3d transition metal cyanocyclopentadienides [M(MeOH)n(H2O)4–n{C5(CN)4X}2] (M=Mn, Fe, Co, Ni, Cu, Zn; X=H, CN, NH2, NO2)
- Crystal structures and FT-IR spectra of three N,N-dicyclohexylmethylammonium halides C13H26N+X− (X = Cl, Br, I)
- Crystal structure and magnetic properties of the ternary rare earth metal-rich transition metallides RE14T3Al3 (RE = Y, Gd–Tm, Lu; T = Co, Ni)
- Modulated vacancy ordering in SrGe6−x (x≈0.45)
- Monitoring the solvation process and stability of Eu2+ in an ionic liquid by in situ luminescence analysis
Artikel in diesem Heft
- Frontmatter
- In this Issue
- Preface
- Congratulations to Professor Wolfgang Bensch on the occasion of his 65th birthday
- Orthorhombic sulfur from Cap Garonne, Mine du Pradet
- An unprecedented structural phase transition in struvite-type compounds: dimorphism of KMgAsO4(H2O)6
- ZrNiAl-type gallides with pronounced metal-metal bonding, and the dimorphism of ScPdGa
- Tripodal methanetrisulfonate ligands in the trinuclear complex {Ni3[CH(SO3)3]2(NMP)8}
- Crystal structure of the high-temperature form of the trisulfide Cs2S3 and the (3+1)D modulated structure of the telluride K37Te28
- Synthesis, crystal structure and properties of Cd(NCS)2 coordination compounds with two different Cd coordination modes
- Crystalline orthorhombic Ln[CO3][OH] (Ln=La, Pr, Nd, Sm, Eu, Gd) compounds hydrothermally synthesised with CO2 from air as carbonate source
- The role of synthesis conditions for structural defects and lattice strain in β-TaON and their effect on photo- and photoelectrocatalysis
- Determination of the charge of Al13 Keggin oligocations intercalated into synthetic hectorite
- Electronic and magnetic properties of the 2H-NbS2 intercalated by 3d transition metal atoms
- CsTb3STe4 und CsTb5S2Te6: Zwei pseudo-ternäre Caesium-Terbium-Chalkogenide mit geordneten S2−- und Te2−-Anionen
- Synthesis, molecular, and crystal structures of 3d transition metal cyanocyclopentadienides [M(MeOH)n(H2O)4–n{C5(CN)4X}2] (M=Mn, Fe, Co, Ni, Cu, Zn; X=H, CN, NH2, NO2)
- Crystal structures and FT-IR spectra of three N,N-dicyclohexylmethylammonium halides C13H26N+X− (X = Cl, Br, I)
- Crystal structure and magnetic properties of the ternary rare earth metal-rich transition metallides RE14T3Al3 (RE = Y, Gd–Tm, Lu; T = Co, Ni)
- Modulated vacancy ordering in SrGe6−x (x≈0.45)
- Monitoring the solvation process and stability of Eu2+ in an ionic liquid by in situ luminescence analysis
