Preparation and structure of HGdP2O7·3H2O

Chehimi-Moumen, Fathia; Hassen‐Chehimi, D. Ben; Férid, Mokhtar; Trabelsi‐Ayadi, Malika

doi:10.1016/s0025-5408(01)00514-1

Cited by 19 publications

(10 citation statements)

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“…The X-ray diffraction data for (1), (2) and (3) were collected on an Oxford Diffraction four-circles X-ray diffractometer XCALIBUR using graphite monochromatized MoKa radiation (k = 0.7173 Å ) and a SAPHIRE CCD detector. The intensity data were corrected for Lorentz and polarization effects.…”

Section: X-ray Single Crystal Studymentioning

confidence: 99%

“…According to literature, based mainly on X-ray powder diffraction and thermal analysis data, two main groups of Ln-diphosphates can be identified: orthorhombic diphsophates MHP 2 O 7 Á3.5 H 2 O with M = La-Sm [23] (type I) and triclinic ones with M = Sm-Lu (Type II). The chemical preparation and crystal structure of the triclinic lanthanide diphosphate acid GdHP 2 O 7 Á3H 2 O was published in [2]. The authors described the diphosphate's framework as pairs of (HP 2 O 7 ) 3-anions interconnected by a strong hydrogen bonds network.…”

Section: Introductionmentioning

confidence: 99%

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AErP2O7 (A = Rb, Cs) and HEuP2O7·3H2O: Crystal Structures, Vibrational Studies and Thermal Behaviours

et al. 2012

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New diphosphates AErP 2 O 7 , A = Rb (1), Cs (2), and HEuP 2 O 7 Á3H 2 O (3) have been prepared via soft chemistry route from evaporation of aqueous solution. Their crystal structures have been solved by single crystal diffraction data. The compounds (1) and (2) crystallize in the monoclinic space group P2 1 /c with the following unit cell dimensions: (1) a = 7.7248(4) Å , b = 10.9342(6) Å , c = 8.6716(3) Å , b = 105.434(4)°and Z = 4; (2) a = 7.9192(4) Å , b = 10.8606(4) Å , c = 8.7684(5) Å , b = 104.317(5)°and Z = 4. Compound (3) crystallises in the triclinic space group P -1, with the unit cell parameters: a = 6.4036(5) Å , b = 6.8753(6) Å , c = 9.7964(8) Å , a = 81.706(7)°, b = 80.218(7)°, c = 88.381(7)°. Crystal structure of (1) and (2) consists of 3D open framework built from [ErO 6 ] octahedra sharing corners with [P 2 O 7 ] units, leading to the formation of channels running along c direction in which A ? [A = Rb(1), Cs(2)] ions are located. The compound (3), on the other hand, exhibits a lamellar structure, in which edge-sharing polyhedra of eightfold coordinated europium form chains along [010]. These chains are joined in turn to each others using diphosphates bridges. A network of O-HÁÁÁO hydrogen bonds reinforces the cohesion of the structure of (3). The diphosphate groups in (1), (2) and (3) adopts an eclipsed configuration. IR and Raman spectra of the three new phosphates show usual signals related to the P 2 O 7 diphosphate group and the water molecule. TG and DTA studies were carried out on crystals of (3). The data are correlated to the crystal structures ones.

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Section: X-ray Single Crystal Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

AErP2O7 (A = Rb, Cs) and HEuP2O7·3H2O: Crystal Structures, Vibrational Studies and Thermal Behaviours

et al. 2012

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“…Les synthèses effectuées à une concentration en Gd 3+ de l'ordre 5.10 -2 M [3], conduisent à des agglomérats de monocristaux (Fig 4.i) qui coexistent avec des monocristaux solitaires de longueur 150-200 µm.…”

Section: Effet De La Concentration Initiale De Gd 3+unclassified

“…Les tentatives de préparation de monocristaux de ces produits ont conduit soit à une poudre microcristalline soit à des cristaux maclés et de très faible dimension [1,2,3]. La synthèse de ces cristaux a été entreprise dans notre laboratoire, depuis 2000, en vue d'obtenir des monocristaux de taille acceptable pour une étude structurale et pour en mesurer ultérieurement les propriétés physiques.…”

Section: Introductionunclassified

“…La synthèse de ces cristaux a été entreprise dans notre laboratoire, depuis 2000, en vue d'obtenir des monocristaux de taille acceptable pour une étude structurale et pour en mesurer ultérieurement les propriétés physiques. Les concentrations en réactifs utilisées dans les synthèses précédentes [1,2,3], sont de l'ordre de 10 -1 M pour le sel de lanthane et 5.10 -2 M pour celui du gadolinium. Dans ce travail, nous nous proposons d'examiner l'effet de différents paramètres opératoires sur la cristallisation de HLaP 2 O 7 ·3H 2 O et de HGdP 2 O 7 ·3H 2 O. Les synthèses ont été réalisées dans des cristallisoirs plongés dans un bain thermostaté.…”

Section: Introductionunclassified

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Étude qualitative de la croissance cristalline de HLnP₂O₇·3H₂O ; (Ln = La, Gd)

et al. 2004

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Abstract. The effect of reagents concentration, pH, and temperature on the crystallization of HLnP 2 O 7 ·3H 2 O (Ln=La, Gd) has been determined separately. The results show that the crystallization is enhanced at ambient temperature, by reducing reagents concentrations and using an optimal value of pH. Monocrystals of HLaP 2 O 7 ·3H 2 O and HGdP 2 O 7 ·3H 2 O have been obtained respectively with a length of 150 µm and 700 µm. The observation of HGdP 2 O 7 ·3H 2 O crystal state at different times of synthesis using optical microcopy indicates that the growth follows a bi-dimensional nucleation mechanism.Résumé. L'influence de la concentration des réactifs, du pH et de la température, ont été étudiées séparément pour déterminer les conditions d'obtention des cristaux HLnP 2 O 7 ·3H 2 O (Ln = La, Gd). Les résultats ont montré que la cristallisation est favorisée, à température ambiante, pour des concentrations de réactifs relativement basses et dans un mélange dont le pH est optimum. Des monocristaux de HLaP 2 O 7 ·3H 2 O et HGdP 2 O 7 ·3H 2 O ont été obtenus de longueur respectives 150 µm et 700 µm. L'observation de l'évolution de la croissance de l'hydrate au gadolinium, par microscopie optique, a permis de conclure qu'elle se fait selon le mécanisme de nucléation bidimensionnelle.

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Crystal structure, vibrational spectra and thermal decomposition study of a new, dicationic, acidic pyrophosphate: KHMgP2O7⋅2H2O

et al. 2005

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Preparation and structure of HGdP2O7·3H2O

Cited by 19 publications

References 4 publications

AErP2O7 (A = Rb, Cs) and HEuP2O7·3H2O: Crystal Structures, Vibrational Studies and Thermal Behaviours

AErP2O7 (A = Rb, Cs) and HEuP2O7·3H2O: Crystal Structures, Vibrational Studies and Thermal Behaviours

Étude qualitative de la croissance cristalline de HLnP₂O₇·3H₂O ; (Ln = La, Gd)

Crystal structure, vibrational spectra and thermal decomposition study of a new, dicationic, acidic pyrophosphate: KHMgP2O7⋅2H2O

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Preparation and structure of HGdP2O7·3H2O

Cited by 19 publications

References 4 publications

AErP2O7 (A = Rb, Cs) and HEuP2O7·3H2O: Crystal Structures, Vibrational Studies and Thermal Behaviours

AErP2O7 (A = Rb, Cs) and HEuP2O7·3H2O: Crystal Structures, Vibrational Studies and Thermal Behaviours

Étude qualitative de la croissance cristalline de HLnP2O7·3H2O ; (Ln = La, Gd)

Crystal structure, vibrational spectra and thermal decomposition study of a new, dicationic, acidic pyrophosphate: KHMgP2O7⋅2H2O

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Étude qualitative de la croissance cristalline de HLnP₂O₇·3H₂O ; (Ln = La, Gd)