Na5[MB24O34(OH)12]·nH2O (M = Cr3+, Al3+): Unprecedented Spherelike Polyborate Clusters from Boric Acid Flux Synthesis
| العنوان: | Na5[MB24O34(OH)12]·nH2O (M = Cr3+, Al3+): Unprecedented Spherelike Polyborate Clusters from Boric Acid Flux Synthesis |
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| المؤلفون: | Xiaodong Zou, Tao Yang, Jianhua Lin, Lars Eriksson, Guobao Li, Fuhui Liao, Junliang Sun |
| المصدر: | Inorganic Chemistry. 47:3228-3233 |
| بيانات النشر: | American Chemical Society (ACS), 2008. |
| سنة النشر: | 2008 |
| مصطلحات موضوعية: | Inorganic Chemistry, Boric acid, chemistry.chemical_compound, chemistry, Inorganic chemistry, Physical and Theoretical Chemistry, Flux synthesis |
| الوصف: | Two novel isotypic polyborate cluster compounds Na 5[MB 24O 34(OH) 12]. nH 2O (M = Cr (3+), Al (3+)) have been synthesized in a boric acid flux closed system at 220 degrees C by using gel as precursors. The structure of the Cr compound was determined by low-temperature single-crystal X-ray diffraction, and the Al compound was confirmed to be isostructural by powder X-ray diffraction and similar FT-IR spectra and thermal behavior. Na 5[CrB 24O 34(OH) 12]. nH 2O crystallizes in the monoclinic space group P2 1/ c with the cell parameters a = 17.4549(3) A, b = 11.1976(2) A, c = 21.2403(3) A, beta = 94.644(2) degrees , V = 4137.85(12) A (3), and Z = 4. The predominant feature of the structure are the spherelike polyborate clusters [MB 24O 34(OH) 12] (5-). The M (3+) cation is located at the center of the cluster, around which four hexaborate units ([B 6O 10(OH) 3] (5-)) are tetrahedrally assembled in almost a perfect T d symmetry. To the best of our knowledge, [MB 24O 34(OH) 12] (5-) is the first example of a polyborate cluster that contains 24 boron atoms. Upon heating, the compounds show two steps of weight loss, including the loss of the disengaged water and dehydration of the hydroxy groups. The first step is reversible, retaining the structure framework. The second weight loss is continuous and irreversible. |
| تدمد: | 1520-510X 0020-1669 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dbe187225cc2a5db602eaaa42d1d3d45 https://doi.org/10.1021/ic702244w |
| رقم الأكسشن: | edsair.doi.dedup.....dbe187225cc2a5db602eaaa42d1d3d45 |
| قاعدة البيانات: | OpenAIRE |
Find this issue from the American Chemical Society | تدمد: | 1520510X 00201669 |
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