Hydrothermal and ionothermal synthesis of mineral-related arsenates in the system CdO-MO-As2O5 (M2+ = Mg, Co, Ni, Cu, Zn) and their crystal structures

Autor(en)

Tamara Đorđević, Sabrina Stefanie Gerger, Ljiljana Karanovic

Abstrakt

During systematic research on the mineral-related arsenates in the system CdO-MO-As

₂O

₅-H

₂O (M

²⁺ = Mg, Co, Ni, Cu, Zn), three new Cd-containing arsenates Cd

_4.65Ni

_0.35 (AsO

₄)2(HAsO

₄)

₂4H

₂O (1), Cd

_0.75Co

_2.75 (H

_0.5AsO

₄)2(HAsO

₄) (2) and Cd

_1.25Zn

_0.75 (HAsO

₄)

₂2H

₂O (3) have been synthesized under hydrothermal conditions, while the Zn-arsenate Zn

₉ (AsO

₄)

₆4H

₂O (4) and again 2 have been prepared under ionothermal conditions using the ionic liquid 1-ethyl-3-methylimidazolium bromide, (C6H11N2)Br, as the solvent. Their crystal structures were determined using single-crystal X-ray diffraction data and refined to the reasonably low R-values: 1 - R

₁ = 0.030; 2 - R

₁ = 0.047; 3 - R

₁ = 0.029; 6 - R

₁ = 0.029. The compounds 1, 2 and 3 are structural analogues of three different arsenate mineral phases. Compound 4 was for the first time synthesized using ionic liquid as the solvent and the hydrogen atoms were found and refined. Infrared and Raman spectra were measured and evaluated in order to obtain further information on the anion groups and especially on the short hydrogen bonds. The OH stretching frequency is in good agreement with the observed O:::O distances. The different approaches in the synthesis of mineral-related arsenates, the temperature treatment as well as the role of added water in ionothermal synthesis are also discussed.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

University of Belgrade

Journal

European Journal of Mineralogy: an international journal of mineralogy, geochemistry and related sciences

Band

29

Seiten

73-89

Anzahl der Seiten

17

ISSN

0935-1221

DOI

https://doi.org/10.1127/ejm/2017/0029-2585

Publikationsdatum

10-2016

Peer-reviewed

Ja

ÖFOS 2012

104026 Spektroskopie, 104017 Physikalische Chemie, 105113 Kristallographie

Schlagwörter

ASJC Scopus Sachgebiete

Geochemistry and Petrology

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/0708c128-9f8a-44f9-a3fe-833a1adc5462