{"title":"三种具有多重质子化 As/PO4 基团的新型酸性 M+ 砷酸盐和磷酸盐。","authors":"Karolina Schwendtner, Uwe Kolitsch","doi":"10.1107/S2053229619008489","DOIUrl":null,"url":null,"abstract":"<p><p>The crystal structures of caesium dihydrogen arsenate(V) bis[trihydrogen arsenate(V)], Cs(H<sub>2</sub>AsO<sub>4</sub>)(H<sub>3</sub>AsO<sub>4</sub>)<sub>2</sub>, ammonium dihydrogen arsenate(V) trihydrogen arsenate(V), NH<sub>4</sub>(H<sub>2</sub>AsO<sub>4</sub>)(H<sub>3</sub>AsO<sub>4</sub>), and dilithium bis(dihydrogen phosphate), Li<sub>2</sub>(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub>, were solved from single-crystal X-ray diffraction data. NH<sub>4</sub>(H<sub>2</sub>AsO<sub>4</sub>)(H<sub>3</sub>AsO<sub>4</sub>), which was hydrothermally synthesized (T = 493 K), is homeotypic with Rb(H<sub>2</sub>AsO<sub>4</sub>)(H<sub>3</sub>AsO<sub>4</sub>), while Cs(H<sub>2</sub>AsO<sub>4</sub>)(H<sub>3</sub>AsO<sub>4</sub>)<sub>2</sub> crystallizes in a novel structure type and Li<sub>2</sub>(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub> represents a new polymorph of this composition. The Cs and Li compounds grew at room temperature from highly acidic aqueous solutions. Li<sub>2</sub>(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub> forms a three-dimensional (3D) framework of PO<sub>4</sub> tetrahedra sharing corners with Li<sub>2</sub>O<sub>6</sub> dimers built of edge-sharing LiO<sub>4</sub> groups, which is reinforced by hydrogen bonds. The two arsenate compounds are characterized by a 3D network of AsO<sub>4</sub> groups that are connected solely via multiple strong hydrogen bonds. A statistical evaluation of the As-O bond lengths in singly, doubly and triply protonated AsO<sub>4</sub> groups gave average values of 1.70 (2) Å for 199 As-OH bonds, 1.728 (19) Å for As-OH bonds in HAsO<sub>4</sub> groups, 1.714 (12) Å for As-OH bonds in H<sub>2</sub>AsO<sub>4</sub> groups and 1.694 (16) Å for As-OH bonds in H<sub>3</sub>AsO<sub>4</sub> groups, and a grand mean value of 1.667 (18) Å for As-O bonds to nonprotonated O atoms.</p>","PeriodicalId":88116,"journal":{"name":"Revue internationale de la Croix-rouge","volume":"73 1","pages":"1134-1141"},"PeriodicalIF":0.0000,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6681722/pdf/","citationCount":"0","resultStr":"{\"title\":\"Three new acid M<sup>+</sup> arsenates and phosphates with multiply protonated As/PO<sub>4</sub> groups.\",\"authors\":\"Karolina Schwendtner, Uwe Kolitsch\",\"doi\":\"10.1107/S2053229619008489\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>The crystal structures of caesium dihydrogen arsenate(V) bis[trihydrogen arsenate(V)], Cs(H<sub>2</sub>AsO<sub>4</sub>)(H<sub>3</sub>AsO<sub>4</sub>)<sub>2</sub>, ammonium dihydrogen arsenate(V) trihydrogen arsenate(V), NH<sub>4</sub>(H<sub>2</sub>AsO<sub>4</sub>)(H<sub>3</sub>AsO<sub>4</sub>), and dilithium bis(dihydrogen phosphate), Li<sub>2</sub>(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub>, were solved from single-crystal X-ray diffraction data. NH<sub>4</sub>(H<sub>2</sub>AsO<sub>4</sub>)(H<sub>3</sub>AsO<sub>4</sub>), which was hydrothermally synthesized (T = 493 K), is homeotypic with Rb(H<sub>2</sub>AsO<sub>4</sub>)(H<sub>3</sub>AsO<sub>4</sub>), while Cs(H<sub>2</sub>AsO<sub>4</sub>)(H<sub>3</sub>AsO<sub>4</sub>)<sub>2</sub> crystallizes in a novel structure type and Li<sub>2</sub>(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub> represents a new polymorph of this composition. The Cs and Li compounds grew at room temperature from highly acidic aqueous solutions. Li<sub>2</sub>(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub> forms a three-dimensional (3D) framework of PO<sub>4</sub> tetrahedra sharing corners with Li<sub>2</sub>O<sub>6</sub> dimers built of edge-sharing LiO<sub>4</sub> groups, which is reinforced by hydrogen bonds. The two arsenate compounds are characterized by a 3D network of AsO<sub>4</sub> groups that are connected solely via multiple strong hydrogen bonds. A statistical evaluation of the As-O bond lengths in singly, doubly and triply protonated AsO<sub>4</sub> groups gave average values of 1.70 (2) Å for 199 As-OH bonds, 1.728 (19) Å for As-OH bonds in HAsO<sub>4</sub> groups, 1.714 (12) Å for As-OH bonds in H<sub>2</sub>AsO<sub>4</sub> groups and 1.694 (16) Å for As-OH bonds in H<sub>3</sub>AsO<sub>4</sub> groups, and a grand mean value of 1.667 (18) Å for As-O bonds to nonprotonated O atoms.</p>\",\"PeriodicalId\":88116,\"journal\":{\"name\":\"Revue internationale de la Croix-rouge\",\"volume\":\"73 1\",\"pages\":\"1134-1141\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2019-08-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6681722/pdf/\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Revue internationale de la Croix-rouge\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1107/S2053229619008489\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2019/7/25 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Revue internationale de la Croix-rouge","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1107/S2053229619008489","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2019/7/25 0:00:00","PubModel":"Epub","JCR":"","JCRName":"","Score":null,"Total":0}
Three new acid M+ arsenates and phosphates with multiply protonated As/PO4 groups.
The crystal structures of caesium dihydrogen arsenate(V) bis[trihydrogen arsenate(V)], Cs(H2AsO4)(H3AsO4)2, ammonium dihydrogen arsenate(V) trihydrogen arsenate(V), NH4(H2AsO4)(H3AsO4), and dilithium bis(dihydrogen phosphate), Li2(H2PO4)2, were solved from single-crystal X-ray diffraction data. NH4(H2AsO4)(H3AsO4), which was hydrothermally synthesized (T = 493 K), is homeotypic with Rb(H2AsO4)(H3AsO4), while Cs(H2AsO4)(H3AsO4)2 crystallizes in a novel structure type and Li2(H2PO4)2 represents a new polymorph of this composition. The Cs and Li compounds grew at room temperature from highly acidic aqueous solutions. Li2(H2PO4)2 forms a three-dimensional (3D) framework of PO4 tetrahedra sharing corners with Li2O6 dimers built of edge-sharing LiO4 groups, which is reinforced by hydrogen bonds. The two arsenate compounds are characterized by a 3D network of AsO4 groups that are connected solely via multiple strong hydrogen bonds. A statistical evaluation of the As-O bond lengths in singly, doubly and triply protonated AsO4 groups gave average values of 1.70 (2) Å for 199 As-OH bonds, 1.728 (19) Å for As-OH bonds in HAsO4 groups, 1.714 (12) Å for As-OH bonds in H2AsO4 groups and 1.694 (16) Å for As-OH bonds in H3AsO4 groups, and a grand mean value of 1.667 (18) Å for As-O bonds to nonprotonated O atoms.
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