Incorporation of Sulfate or Selenate Groups into Oxotellurates(IV): I. Calcium,Cadmium, and Strontium Compounds |
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| Authors: | Matthias Weil Mahdi Shirkhanlou |
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| Institution: | Institute for Chemical Technologies and Analytics, Division Structural Chemistry, TU Wien, Vienna, Austria |
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| Abstract: | Seven new mixed oxochalcogenate compounds in the systems MII/XVI/TeIV/O/(H), (MII = Ca, Cd, Sr; XVI = S, Se) were obtained under hydrothermal conditions (210 °C, one week). Crystal structure determinations based on single‐crystal X‐ray diffraction data revealed the compositions Ca3(SeO4)(TeO3)2, Ca3(SeO4)(Te3O8), Cd3(SeO4)(Te3O8), Cd3(H2O)(SO4)(Te3O8), Cd4(SO4)(TeO3)3, Cd5(SO4)2(TeO3)2(OH)2, and Sr3(H2O)2(SeO4)(TeO3)2 for these phases. Peculiar features of the crystal structures of Ca3(SeO4)(TeO3)2, Ca3(SeO4)(Te3O8), Cd3(SeO4)(Te3O8), Cd3(H2O)(SO4)(Te3O8), and Sr3(H2O)2(SeO4)(TeO3)2 are metal‐oxotellurate(IV) layers connected by bridging XO4 tetrahedra and/or by hydrogen‐bonding interactions involving hydroxyl or water groups, whereas Cd4(SO4)(TeO3)3 and Cd5(SO4)2(TeO3)2(OH)2 crystallize as framework structures. Common to all crystal structures is the stereoactivity of the TeIV electron lone pair for each oxotellurate(IV) unit, pointing either into the inter‐layer space, or into channels and cavities in the crystal structures. |
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| Keywords: | Crystal engineering Hydrothermal synthesis Oxotellurates(IV) Mixed oxochalcogenates Crystal structure |
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