Barium aluminate hydrates. I. A barium analogue of hydrogarnet

Ahmed, A. H. M.; Glasser, Leslie

doi:10.1107/s0567740869005358

Cited by 7 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only a few publications state precise values for the O–H valence vibration frequencies of katoite type hydrogarnets; data of fully OH‐substituted hydrogarnets of transition metals were not reported. Katoite itself shows a sharp ν̃ O–H ‐band at 3658 cm –1 indicating a similar O–H bond strength as in our hydrogarnets …”

Section: Resultssupporting

confidence: 68%

Syntheses, Crystal Structures and Physical Properties of Chromium and Rhodium Hydrogarnets Ca₃[Cr(OH)₆]₂, Sr₃[Cr(OH)₆]₂ and Sr₃[Rh(OH)₆]₂

et al. 2019

View full text Add to dashboard Cite

The hydrogarnets Ca3[Cr(OH)6]2, Sr3[Cr(OH)6]2 and Sr3[Rh(OH)6]2 were synthesized under hydroflux condition at about 200 °C. The starting materials Ca(NO3)2·6H2O, Sr(NO3)2, Cr(NO3)3·9H2O and RhI3 were reacted in mixtures of water and potassium hydroxide with molar ratios between 1.2:1 and 3:1. The structures and thermal properties of these hydrogarnets were studied by X‐ray diffraction, thermal analysis, electron microscopy as well as infrared and UV/Vis spectroscopy. Low temperature single‐crystal diffraction measurements revealed katoite‐like structures, in which the tetrahedrally coordinated metal positions of the garnet are unoccupied and hydroxide ions replace the oxide anions for charge compensation. IR spectroscopy confirmed the presence of hydroxide groups, which form weak hydrogen bonds. The thermal decomposition of Ca3[CrIII(OH)6]2 first yields CaCrVIO4 and CaO at 314 °C, which then react to Ca3(CrVO4)2 at 823 °C. The decomposition of Sr3[Cr(OH)6]2 proceeds similarly in the first step but results in the mixed valent compound Sr2.67(CrVO4)1.33(CrVIO4)0.67 at 730 °C. The decomposition of Sr3[Rh(OH)6]2 under the same conditions results in Sr10.5RhIII3RhIV4.5O24.

show abstract

Section: Resultssupporting

confidence: 68%

Syntheses, Crystal Structures and Physical Properties of Chromium and Rhodium Hydrogarnets Ca₃[Cr(OH)₆]₂, Sr₃[Cr(OH)₆]₂ and Sr₃[Rh(OH)₆]₂

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In the group of barium hydrogarnets, Ba 3 [Al(OH) 6 ] 2 , Ba 3 [In(OH) 6 ] 2 and Ba 3 [Sc(OH) 6 ] 2 are the only known representatives [5,6]. These compounds were synthesized by using the hydrothermal method yielding fine powders.…”

Section: Introductionmentioning

confidence: 99%

Hydroflux syntheses and crystal structures of hydrogarnets Ba₃[RE(OH)₆]₂ (RE = Sc, Y, Ho–Lu)

Albrecht

Grassme

Doert

et al. 2020

Zeitschrift Für Naturforschung B

View full text Add to dashboard Cite

Colorless crystals of the barium rare earth hydrogarnets Ba3[RE(OH)6]2 (RE = Sc, Y, Ho–Lu) were synthesized under hydroflux conditions with KOH at about T = 200 °C starting from the respective RE2O3 and Ba (NO3)2. Single-crystal X-ray diffraction analysis on these distorted rhombic dodecahedra revealed the cubic space group Ia$‾{3}$d (no. 230). The crystal structures of the hydrogarnets Ba3[RE(OH)6]2 are discussed and compared with those of other hydrogarnets. The occurrence of additional reflections, which do not fulfill the reflection conditions of Ia$‾{3}$d, is analyzed and described by Renninger or λ/2 effects. A correlation is established between the space group adopted by a hydrogarnet and characteristic interatomic distances. In addition, single-crystal structure data of the strontium indium hydrogarnet Sr3[In(OH)6]2 are provided.

show abstract

Berechnung der Protonenschwingung in Wasserstoffbrüicken

Zigan

1974

Ber Bunsenges Phys Chem

View full text Add to dashboard Cite

In einer Wasserstoffbrücke AH —B wirkt auf das Proton das Potential W= UA + UB. Vorausgesetzt wird UA = FA(RA) · GA(ΦA). RA, ΦA sind Polarkoordinaten in einem mit A fest verbundenen System, dessen Pol MA auf einer Symmetrieachse durch A, doch i. allg. nicht in A liegt. FA ist die ‐ an |MAA| ≠ 0 angepaßte – Potentialfunktion von Lippincott und Schroeder. GA hat die Form GA(ΦA) = 1 ‐ aA sin2bAΦA. Analog sind UB, RB, ΦB definiert. Die Symmetrieachsen von UA, UB liegen in der x,y‐Ebene. Berechnet werden für verschiedene geometrische Konfigurationen Gleichgewichtslage und Schwingungseigenschaften des Protons, letztere mit Hilfe des Tensors der zweiten Ableitung von W nach x, y, z.Die Schwingungseigenschaften sind u. a. abhängig von |MAA|, |MBB|. In der linearen Brücke schwingt das Proton rotationssymmetrisch um AH. Der Übergang zur geknickten Brücke verursacht u. a. folgende Effekte: Die Gleichgewichtslage des Protons verschiebt sich. Die beiden Knickfrequenzen spalten auf, wobei diejenige der x, y‐Schwingung deutlich abnimmt. Die Hauptschwingungsachsen führen gegenüber AH eine Drehung aus, die in den meisten Fällen der von HB entgegengerichtet ist.

show abstract

Barium aluminate hydrates. I. A barium analogue of hydrogarnet

Cited by 7 publications

References 2 publications

Syntheses, Crystal Structures and Physical Properties of Chromium and Rhodium Hydrogarnets Ca₃[Cr(OH)₆]₂, Sr₃[Cr(OH)₆]₂ and Sr₃[Rh(OH)₆]₂

Syntheses, Crystal Structures and Physical Properties of Chromium and Rhodium Hydrogarnets Ca₃[Cr(OH)₆]₂, Sr₃[Cr(OH)₆]₂ and Sr₃[Rh(OH)₆]₂

Hydroflux syntheses and crystal structures of hydrogarnets Ba₃[RE(OH)₆]₂ (RE = Sc, Y, Ho–Lu)

Berechnung der Protonenschwingung in Wasserstoffbrüicken

Contact Info

Product

Resources

About

Barium aluminate hydrates. I. A barium analogue of hydrogarnet

Cited by 7 publications

References 2 publications

Syntheses, Crystal Structures and Physical Properties of Chromium and Rhodium Hydrogarnets Ca3[Cr(OH)6]2, Sr3[Cr(OH)6]2 and Sr3[Rh(OH)6]2

Syntheses, Crystal Structures and Physical Properties of Chromium and Rhodium Hydrogarnets Ca3[Cr(OH)6]2, Sr3[Cr(OH)6]2 and Sr3[Rh(OH)6]2

Hydroflux syntheses and crystal structures of hydrogarnets Ba3[RE(OH)6]2 (RE = Sc, Y, Ho–Lu)

Berechnung der Protonenschwingung in Wasserstoffbrüicken

Contact Info

Product

Resources

About

Syntheses, Crystal Structures and Physical Properties of Chromium and Rhodium Hydrogarnets Ca₃[Cr(OH)₆]₂, Sr₃[Cr(OH)₆]₂ and Sr₃[Rh(OH)₆]₂

Syntheses, Crystal Structures and Physical Properties of Chromium and Rhodium Hydrogarnets Ca₃[Cr(OH)₆]₂, Sr₃[Cr(OH)₆]₂ and Sr₃[Rh(OH)₆]₂

Hydroflux syntheses and crystal structures of hydrogarnets Ba₃[RE(OH)₆]₂ (RE = Sc, Y, Ho–Lu)