Maximilian Kai Reimann, Jutta Kösters, Rainer Pöttgen
{"title":"Ba3Mg4Au4 - 由 BaAu2-和 BaMg2Au 相关板块组成的三元榴辉体","authors":"Maximilian Kai Reimann, Jutta Kösters, Rainer Pöttgen","doi":"10.1515/znb-2023-0033","DOIUrl":null,"url":null,"abstract":"The ternary auride Ba<jats:sub>3</jats:sub>Mg<jats:sub>4</jats:sub>Au<jats:sub>4</jats:sub> was synthesized from the elements in a sealed tantalum ampoule. The Ba<jats:sub>3</jats:sub>Mg<jats:sub>4</jats:sub>Au<jats:sub>4</jats:sub> structure was refined from single-crystal X-ray diffractometer data: Gd<jats:sub>3</jats:sub>Cu<jats:sub>4</jats:sub>Ge<jats:sub>4</jats:sub> type, space group <jats:italic>Immm</jats:italic>, <jats:italic>a</jats:italic> = 447.95(10), <jats:italic>b</jats:italic> = 843.07(18), <jats:italic>c</jats:italic> = 1564.2(5) pm, <jats:italic>wR</jats:italic>2 = 0.0935, 680 <jats:italic>F</jats:italic> <jats:sup>2</jats:sup> values, 23 variables. Ba<jats:sub>3</jats:sub>Mg<jats:sub>4</jats:sub>Au<jats:sub>4</jats:sub> is a 1:2 intergrowth structure of BaAu<jats:sub>2</jats:sub>-(AlB<jats:sub>2</jats:sub> type) and BaMg<jats:sub>2</jats:sub>Au-(MgCuAl<jats:sub>2</jats:sub> type) related slabs. The two crystallographically independent gold atoms both have tricapped trigonal prismatic coordination, i.e. Au1@Mg<jats:sub>6</jats:sub>Ba<jats:sub>3</jats:sub> and Au2@Mg<jats:sub>2</jats:sub>Ba<jats:sub>6</jats:sub>Au. The Au–Mg (284–303 pm) and Ba–Au (331–349 pm) distances cover small ranges that are close to the sums of the covalent radii. The magnesium atoms in the MgCuAl<jats:sub>2</jats:sub>-related slab show Mg–Mg distances of 320–332 pm. The different coloring variants of the Gd<jats:sub>3</jats:sub>Cu<jats:sub>4</jats:sub>Ge<jats:sub>4</jats:sub> type are briefly discussed.","PeriodicalId":23831,"journal":{"name":"Zeitschrift für Naturforschung B","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Ba3Mg4Au4 – a ternary auride composed of BaAu2- and BaMg2Au-related slabs\",\"authors\":\"Maximilian Kai Reimann, Jutta Kösters, Rainer Pöttgen\",\"doi\":\"10.1515/znb-2023-0033\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The ternary auride Ba<jats:sub>3</jats:sub>Mg<jats:sub>4</jats:sub>Au<jats:sub>4</jats:sub> was synthesized from the elements in a sealed tantalum ampoule. The Ba<jats:sub>3</jats:sub>Mg<jats:sub>4</jats:sub>Au<jats:sub>4</jats:sub> structure was refined from single-crystal X-ray diffractometer data: Gd<jats:sub>3</jats:sub>Cu<jats:sub>4</jats:sub>Ge<jats:sub>4</jats:sub> type, space group <jats:italic>Immm</jats:italic>, <jats:italic>a</jats:italic> = 447.95(10), <jats:italic>b</jats:italic> = 843.07(18), <jats:italic>c</jats:italic> = 1564.2(5) pm, <jats:italic>wR</jats:italic>2 = 0.0935, 680 <jats:italic>F</jats:italic> <jats:sup>2</jats:sup> values, 23 variables. Ba<jats:sub>3</jats:sub>Mg<jats:sub>4</jats:sub>Au<jats:sub>4</jats:sub> is a 1:2 intergrowth structure of BaAu<jats:sub>2</jats:sub>-(AlB<jats:sub>2</jats:sub> type) and BaMg<jats:sub>2</jats:sub>Au-(MgCuAl<jats:sub>2</jats:sub> type) related slabs. The two crystallographically independent gold atoms both have tricapped trigonal prismatic coordination, i.e. Au1@Mg<jats:sub>6</jats:sub>Ba<jats:sub>3</jats:sub> and Au2@Mg<jats:sub>2</jats:sub>Ba<jats:sub>6</jats:sub>Au. The Au–Mg (284–303 pm) and Ba–Au (331–349 pm) distances cover small ranges that are close to the sums of the covalent radii. The magnesium atoms in the MgCuAl<jats:sub>2</jats:sub>-related slab show Mg–Mg distances of 320–332 pm. The different coloring variants of the Gd<jats:sub>3</jats:sub>Cu<jats:sub>4</jats:sub>Ge<jats:sub>4</jats:sub> type are briefly discussed.\",\"PeriodicalId\":23831,\"journal\":{\"name\":\"Zeitschrift für Naturforschung B\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-04-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Zeitschrift für Naturforschung B\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1515/znb-2023-0033\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Zeitschrift für Naturforschung B","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1515/znb-2023-0033","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Ba3Mg4Au4 – a ternary auride composed of BaAu2- and BaMg2Au-related slabs
The ternary auride Ba3Mg4Au4 was synthesized from the elements in a sealed tantalum ampoule. The Ba3Mg4Au4 structure was refined from single-crystal X-ray diffractometer data: Gd3Cu4Ge4 type, space group Immm, a = 447.95(10), b = 843.07(18), c = 1564.2(5) pm, wR2 = 0.0935, 680 F2 values, 23 variables. Ba3Mg4Au4 is a 1:2 intergrowth structure of BaAu2-(AlB2 type) and BaMg2Au-(MgCuAl2 type) related slabs. The two crystallographically independent gold atoms both have tricapped trigonal prismatic coordination, i.e. Au1@Mg6Ba3 and Au2@Mg2Ba6Au. The Au–Mg (284–303 pm) and Ba–Au (331–349 pm) distances cover small ranges that are close to the sums of the covalent radii. The magnesium atoms in the MgCuAl2-related slab show Mg–Mg distances of 320–332 pm. The different coloring variants of the Gd3Cu4Ge4 type are briefly discussed.
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