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Pascoite Minerals and Potential Application of NMR Spectroscopy. MINERALS 2022. [DOI: 10.3390/min12080980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
The 20 minerals encompassing the pascoite family of decavanadate isopolyanion-containing [V10O28]6− minerals include a few minerals, such as rakovanite, that have been described as containing a protonated decavanadate anion. Rakovanite was originally assigned the formula Na3[H3V10O28]•15H2O and now is redefined with an ideal formula (NH4)3Na3[V10O28]•12H2O. Nuclear magnetic resonance (NMR) and particularly 51V NMR spectroscopy is an informative method used to describe the protonation state and speciation in both solid and solution states of materials in the chemical and life sciences. However, 51V NMR spectroscopy has not yet been used experimentally to distinguish the protonation state of the decavanadate ion of leaching solutions and thus contributing to the discussion regarding the controversial protonation states of decavanadate ions in gunterite, rakovanite, and nashite. In contrast, the morphology and crystal structure for apatites, vanadinite, pyromorphite, and mimetite was related to 207Pb NMR chemical shifts, assisting in describing the local environments of these minerals. NMR spectroscopy could be a useful method if used in the future for decavanadate-containing minerals. Currently, partial reduction of two Pascoite minerals (caseyite and nashite) is proposed and accordingly could now effectively be investigated using a different magnetic resonance technique, EPR spectroscopy.
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Krivovichev SV. Polyoxometalate clusters in minerals: review and complexity analysis. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2020; 76:618-629. [PMID: 32831280 DOI: 10.1107/s2052520620007131] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 05/27/2020] [Indexed: 06/11/2023]
Abstract
Most research on polyoxometalates (POMs) has been devoted to synthetic compounds. However, recent mineralogical discoveries of POMs in mineral structures demonstrate their importance in geochemical systems. In total, 15 different types of POM nanoscale-size clusters in minerals are described herein, which occur in 42 different mineral species. The topological diversity of POM clusters in minerals is rather restricted compared to the multitude of moieties reported for synthetic compounds, but the lists of synthetic and natural POMs do not overlap completely. The metal-oxo clusters in the crystal structures of the vanarsite-group minerals ([As3+V4+2V5+10As5+6O51]7-), bouazzerite and whitecapsite ([M3+3Fe7(AsO4)9O8-;n(OH)n]), putnisite ([Cr3+8(OH)16(CO3)8]8-), and ewingite ([(UO2)24(CO3)30O4(OH)12(H2O)8]32-) contain metal-oxo clusters that have no close chemical or topological analogues in synthetic chemistry. The interesting feature of the POM cluster topologies in minerals is the presence of unusual coordination of metal atoms enforced by the topological restraints imposed upon the cluster geometry (the cubic coordination of Fe3+ and Ti4+ ions in arsmirandite and lehmannite, respectively, and the trigonal prismatic coordination of Fe3+ in bouazzerite and whitecapsite). Complexity analysis indicates that ewingite and morrisonite are the first and the second most structurally complex minerals known so far. The formation of nanoscale clusters can be viewed as one of the leading mechanisms of generating structural complexity in both minerals and synthetic inorganic crystalline compounds. The discovery of POM minerals is one of the specific landmarks of descriptive mineralogy and mineralogical crystallography of our time.
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Affiliation(s)
- Sergey V Krivovichev
- Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, University Emb. 7/9, St. Petersburg, 199034, Russian Federation
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Britvin SN, Pekov IV, Yapaskurt VO, Koshlyakova NN, Göttlicher J, Krivovichev SV, Turchkova AG, Sidorov EG. Polyoxometalate chemistry at volcanoes: discovery of a novel class of polyoxocuprate nanoclusters in fumarolic minerals. Sci Rep 2020; 10:6345. [PMID: 32286401 PMCID: PMC7156706 DOI: 10.1038/s41598-020-63109-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 03/24/2020] [Indexed: 11/16/2022] Open
Abstract
Polyoxometalate (POM) chemistry is an important avenue of comprehensive chemical research, due to the broad chemical, topological and structural variations of multinuclear polyoxoanions that result in advanced functionality of their derivatives. The majority of compounds in the polyoxometalate kingdom are synthesized under laboratory conditions. However, Nature has its own labs with the conditions often unconceivable to the mankind. The striking example of such a unique environment is volcanic fumaroles – the natural factories of gas-transport synthesis. We herein report on the discovery of a novel class of complex polyoxocuprates grown in the hot active fumaroles of the Tolbachik volcano at the Kamchatka Peninsula, Russia. The cuboctahedral nanoclusters {[MCu12O8](AsO4)8} are stabilized by the core Fe(III) or Ti(IV) cations residing in the unique cubic coordination. The nanoclusters are uniformly dispersed over the anion- and cation-deficient NaCl matrix. Our discovery might have promising implications for synthetic chemistry, indicating the possibility of preparation of complex polyoxocuprates by chemical vapor transport (CVT) techniques that emulate formation of minerals in high-temperature volcanic fumaroles.
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Affiliation(s)
- S N Britvin
- Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, University Embankment 7/9, 199034, St Petersburg, Russia.,Kola Science Center of Russian Academy of Sciences, Fersman Str. 14, 184200, Apatity, Russia
| | - I V Pekov
- Faculty of Geology, Moscow State University, Vorobievy Gory, 119991, Moscow, Russia
| | - V O Yapaskurt
- Faculty of Geology, Moscow State University, Vorobievy Gory, 119991, Moscow, Russia
| | - N N Koshlyakova
- Faculty of Geology, Moscow State University, Vorobievy Gory, 119991, Moscow, Russia
| | - J Göttlicher
- Karlsruhe Institute of Technology, Institute for Synchrotron Radiation, Hermann-von-Helmholtz-Platz 1, D-, 76344, Eggenstein-Leopoldshafen, Germany
| | - S V Krivovichev
- Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, University Embankment 7/9, 199034, St Petersburg, Russia. .,Kola Science Center of Russian Academy of Sciences, Fersman Str. 14, 184200, Apatity, Russia.
| | - A G Turchkova
- Faculty of Geology, Moscow State University, Vorobievy Gory, 119991, Moscow, Russia
| | - E G Sidorov
- Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Piip Boulevard 9, 683006, Petropavlovsk-Kamchatsky, Russia
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Cooper MA, Hawthorne FC, Kampf AR, Hughes JM. Identifying Protonated Decavanadate Polyanions. ACTA ACUST UNITED AC 2019. [DOI: 10.3749/canmin.1800069] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Mark A. Cooper
- Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
| | - Frank C. Hawthorne
- Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
| | - Anthony R. Kampf
- Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA
| | - John M. Hughes
- Department of Geology, University of Vermont, Burlington, Vermont 05405, USA
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