Das erste Vanadium(III)‐Borophosphat: Darstellung und Kristallstruktur von CsV3(H2O)2[B2P4O16(OH)4] |
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| Authors: | Holger Engelhardt,Horst Borrmann,Walter Schnelle,Rü diger Kniep |
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| Abstract: | The First Vanadium(III) Borophosphate: Synthesis and Crystal Structure of CsV3(H2O)2[B2P4O16(OH)4] CsV3(H2O)2[B2P4O16(OH)4] was prepared under mild hydrothermal conditions (T = 165 °C) from mixtures of CsOH(aq), VCl3, H3BO3, and H3PO4 (molar ratio 1 : 1 : 1 : 2). The crystal structure was determined by X‐ray single crystal methods (monoclinic; space group C2/m, No. 12): a = 958.82(15) pm, b = 1840.8(4) pm, c = 503.49(3) pm; β = 110.675(4)°; Z = 2. The anionic partial structure contains oligomeric units [BP2O8(OH)2]5–, which are built up by a central BO2(OH)2 tetrahedron and two PO4 tetrahedra sharing common corners. VIII is octahedrally coordinated by oxygen of adjacent phosphate tetrahedra and OH groups of borate tetrahedra as well as oxygen of phosphate tetrahedra and H2O molecules, respectively (coordination octahedra VO4(OH)2 and VO4(H2O)2). The oxidation state +3 for vanadium was confirmed by measurements of the magnetic susceptibility. The trimeric borophosphate groups are connected via vanadium centres to form layers with octahedra‐tetrahedra ring systems, which are likewise linked via VIII‐coordination octahedra. Overall, a three‐dimensional framework constructed from VO4(OH)2 and VO4(H2O)2 octahedra as well as BO2(OH)2 and PO4 tetrahedra results. The structure contains channels running along [001], which are occupied by Cs+ in a distorted octahedral coordination (CsO4(H2O)2). |
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| Keywords: | Borophosphate Crystal structure Oligomeric units Phosphate Vanadium |
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