Crystal structures of new pyrovanadates A2MnV2O 7 (A = Rb, K)

Hamdi Yahia, Etienne Gaudin, Jacques Darriet

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The new compounds A2MnV2O7 (A - K, Rb) with structures related to the melilite-type have been synthesized by a solid state reaction route. The crystal structures of K2MnV 2O7, Rb2MnV2O7 and KRbMnV2O7 have been determined using X-ray single crystal diffraction data. The compound K2MnV2O7 crystallizes with a melilite-type structure with tetragonal unit cell parameters a = 8.609(3), c = 5.538(4) Åand space group P4̄21m. The structures of Rb2MnV2O7 and KRbMnV 2O7 are derived from the mehlite-type structure with space group P42mnm and unit cell parameters a = 8.577(6), c=11.809(6) Å, and a = 8.530(6), c = 11.466(5) Å, respectively. The three structures consist of [MnV2O7]2- layers perpendicular to the c axis separated by A+ layers. The [MnV 2O7]2- layers feature corner-sharing MnO 4 tetrahedra and V2O7 pyrovanadate units, the linkage leading to rings of five tetrahedra. The doubling of the c parameter for Rb2MnV2O7 or Rb2MnV 2O7 is explained by the existence of a mirror plane perpendicular to the [001] direction between two [MnV2O 7]2- layers. The A+ alkali cations occupy distorted square antiprisms of oxygen atoms in K2MnV 2O7 and distorted square prisms of oxygen atoms in Rb 2MnV2O7 and Rb2MnV2O 7.

Original languageEnglish
Pages (from-to)873-880
Number of pages8
JournalZeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Volume62
Issue number7
Publication statusPublished - Jul 2007
Externally publishedYes

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Crystal structure
Oxygen
Atoms
Alkalies
Prisms
Solid state reactions
Cations
Mirrors
Diffraction
Single crystals
X rays
Direction compound

Keywords

  • Crystal chemistry
  • Melilite
  • Oxides
  • Single crystal X-Ray diffraction
  • Vanadate

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Organic Chemistry

Cite this

Crystal structures of new pyrovanadates A2MnV2O 7 (A = Rb, K). / Yahia, Hamdi; Gaudin, Etienne; Darriet, Jacques.

In: Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences, Vol. 62, No. 7, 07.2007, p. 873-880.

Research output: Contribution to journalArticle

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abstract = "The new compounds A2MnV2O7 (A - K, Rb) with structures related to the melilite-type have been synthesized by a solid state reaction route. The crystal structures of K2MnV 2O7, Rb2MnV2O7 and KRbMnV2O7 have been determined using X-ray single crystal diffraction data. The compound K2MnV2O7 crystallizes with a melilite-type structure with tetragonal unit cell parameters a = 8.609(3), c = 5.538(4) {\AA}and space group P4̄21m. The structures of Rb2MnV2O7 and KRbMnV 2O7 are derived from the mehlite-type structure with space group P42mnm and unit cell parameters a = 8.577(6), c=11.809(6) {\AA}, and a = 8.530(6), c = 11.466(5) {\AA}, respectively. The three structures consist of [MnV2O7]2- layers perpendicular to the c axis separated by A+ layers. The [MnV 2O7]2- layers feature corner-sharing MnO 4 tetrahedra and V2O7 pyrovanadate units, the linkage leading to rings of five tetrahedra. The doubling of the c parameter for Rb2MnV2O7 or Rb2MnV 2O7 is explained by the existence of a mirror plane perpendicular to the [001] direction between two [MnV2O 7]2- layers. The A+ alkali cations occupy distorted square antiprisms of oxygen atoms in K2MnV 2O7 and distorted square prisms of oxygen atoms in Rb 2MnV2O7 and Rb2MnV2O 7.",
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N2 - The new compounds A2MnV2O7 (A - K, Rb) with structures related to the melilite-type have been synthesized by a solid state reaction route. The crystal structures of K2MnV 2O7, Rb2MnV2O7 and KRbMnV2O7 have been determined using X-ray single crystal diffraction data. The compound K2MnV2O7 crystallizes with a melilite-type structure with tetragonal unit cell parameters a = 8.609(3), c = 5.538(4) Åand space group P4̄21m. The structures of Rb2MnV2O7 and KRbMnV 2O7 are derived from the mehlite-type structure with space group P42mnm and unit cell parameters a = 8.577(6), c=11.809(6) Å, and a = 8.530(6), c = 11.466(5) Å, respectively. The three structures consist of [MnV2O7]2- layers perpendicular to the c axis separated by A+ layers. The [MnV 2O7]2- layers feature corner-sharing MnO 4 tetrahedra and V2O7 pyrovanadate units, the linkage leading to rings of five tetrahedra. The doubling of the c parameter for Rb2MnV2O7 or Rb2MnV 2O7 is explained by the existence of a mirror plane perpendicular to the [001] direction between two [MnV2O 7]2- layers. The A+ alkali cations occupy distorted square antiprisms of oxygen atoms in K2MnV 2O7 and distorted square prisms of oxygen atoms in Rb 2MnV2O7 and Rb2MnV2O 7.

AB - The new compounds A2MnV2O7 (A - K, Rb) with structures related to the melilite-type have been synthesized by a solid state reaction route. The crystal structures of K2MnV 2O7, Rb2MnV2O7 and KRbMnV2O7 have been determined using X-ray single crystal diffraction data. The compound K2MnV2O7 crystallizes with a melilite-type structure with tetragonal unit cell parameters a = 8.609(3), c = 5.538(4) Åand space group P4̄21m. The structures of Rb2MnV2O7 and KRbMnV 2O7 are derived from the mehlite-type structure with space group P42mnm and unit cell parameters a = 8.577(6), c=11.809(6) Å, and a = 8.530(6), c = 11.466(5) Å, respectively. The three structures consist of [MnV2O7]2- layers perpendicular to the c axis separated by A+ layers. The [MnV 2O7]2- layers feature corner-sharing MnO 4 tetrahedra and V2O7 pyrovanadate units, the linkage leading to rings of five tetrahedra. The doubling of the c parameter for Rb2MnV2O7 or Rb2MnV 2O7 is explained by the existence of a mirror plane perpendicular to the [001] direction between two [MnV2O 7]2- layers. The A+ alkali cations occupy distorted square antiprisms of oxygen atoms in K2MnV 2O7 and distorted square prisms of oxygen atoms in Rb 2MnV2O7 and Rb2MnV2O 7.

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