| Title: |
Anhydrous alkali copper sulfates-a promising playground for new Cu 2+ oxide complexes: new Rb-analogues of fumarolic minerals related compounds |
| Authors: |
Siidra, Oleg, I; Nekrasova, Diana, O; Charkin, Dmitry, O; Zaitsev, Anatoly, N; Borisov, Artem, S; Colmont, Marie; Mentré, Olivier; Spiridonova, Darya, V |
| Contributors: |
Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS); Université d'Artois (UA)-Centrale Lille-Institut de Chimie - CNRS Chimie (INC-CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS) |
| Source: |
ISSN: 0026-461X. |
| Publisher Information: |
CCSD; Mineralogical Society |
| Publication Year: |
2021 |
| Collection: |
LillOA (HAL Lille Open Archive, Université de Lille) |
| Subject Terms: |
crystal structures; fumaroles; gas transport reactions; solid state reactions; fumarolic minerals; sulfates; rubidium; [CHIM]Chemical Sciences |
| Description: |
International audience ; Abstract We report the crystal structures of eight new synthetic multinary Rb–Cu sulfates representing four new structure types: δ-Rb 2 Cu(SO 4 ) 2 , γ-RbNaCu(SO 4 ) 2 , γ-RbKCu(SO 4 ) 2 , Rb 2 Cu 2 (SO 4 ) 3 , Rb 2 Cu 2 (SO 4 ) 3 (H 2 O), β-Rb 2 Cu(SO 4 )Cl 2 , β-Rb 4 Cu 4 O 2 (SO 4 ) 4 ⋅(Cu 0.83 Rb 0.17 Cl) and Rb 2 Cu 5 O(SO 4 ) 5 . The determination of their crystal structures significantly expands the family of anhydrous copper sulfates. Some of the anhydrous rubidium copper sulfates obtained turned out to be isostructural to known compounds and minerals. Rb 2 Cu 5 O(SO 4 ) 5 is isostructural to cesiodymite, CsKCu 5 O(SO 4 ) 5 and cryptochalcite, K 2 Cu 5 O(SO 4 ) 5 . Rb 2 Cu 2 (SO 4 ) 3 also shows an example of crystallisation in the already known structure type first observed for synthetic K 2 Cu 2 (SO 4 ) 3 . ‘Hydrolangbeinite’, Rb 2 Cu 2 (SO 4 ) 3 (H 2 O), was formed as a result of a minor hydration of the initial mixture of reagents. The minerals and synthetic framework compounds of the A 2 Cu(SO 4 ) 2 series demonstrate a vivid example of morphotropism with the formation of structural types depending on the size of the cations residing in the cavities of the [Cu(SO 4 ) 2 ] 2– open framework. To date, five types (α, β, γ, δ and ε) can be distinguished. We propose to call this series of compounds ‘saranchinaite-type’, as the stoichiometry A 2 Cu(SO 4 ) 2 was first encountered during the discovery and description of saranchinaite, Na 2 Cu(SO 4 ) 2 . The discovery of β-Rb 2 Cu(SO 4 )Cl 2 , a new monoclinic polymorph of chlorothionite, seems to be of particular interest considering the recently discovered interesting magnetic properties of synthetic K 2 Cu(SO 4 ) X 2 ( X = Cl and Br) and Na 2 Cu(SO 4 )Cl 2 . In these new structural architectures, a number of features have been revealed that were seldom observed previously. The first is the bidentate coordination of the sulfate tetrahedron via edge-sharing with the Cu 2+ -centred coordination polyhedron. Until recently, such ... |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1180/mgm.2021.73 |
| Availability: |
https://hal.science/hal-03438932; https://hal.science/hal-03438932v1/document; https://hal.science/hal-03438932v1/file/Rb_sulfates.pdf; https://doi.org/10.1180/mgm.2021.73 |
| Rights: |
https://about.hal.science/hal-authorisation-v1/ ; info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.3635086 |
| Database: |
BASE |