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碱式乙酸铍

碱式乙酸铍
Beacetate.png
系统名
Hexakis(μ-acetato)-μ(sup 4)-oxotetraberyllium
别名 碱式乙酸铍
Beryllium oxyacetate
Beryllium oxide acetate
识别
CAS号 19049-40-2  checkY
PubChem 3035396
ChemSpider 2299653
EINECS 242-785-4
性质
化学式 C
12
H
18
Be
4
O
13
摩尔质量 406.3122 g·mol⁻¹
外观 无色
熔点 285 °C(558 K)
沸点 330 °C(603 K)
溶解性(氯仿)
危险性
PEL TWA(时量平均浓度) 0.002 mg/m3
C 0.005 mg/m3(30分钟),最高浓度为0.025 mg/m3(和Be一样)[1]
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

碱式乙酸铍(Basic beryllium acetate)是化学式为Be4O(O2CCH3)6化合物。目前没有应用会用到碱式乙酸铍,相关研究不同,其结构很特殊。碱式乙酸铍是无色固体,可溶于有机溶剂中。

制备

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碱式乙酸铍可以用碱式碳酸铍和热乙酸反应制备。

2 Be
2
CO
3
(OH)
2
+ 6 AcOH → Be4O(AcO)6 + 5 H
2
O
+ 2 CO
2

碱式乙酸铍不溶于水,但可溶于非极性的氯仿。碱式乙酸铍在真空中会融化及升华,不会分解[2]

结构

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碱式乙酸盐的中心会有几个金属离子及一个氧离子,外围会有数个乙酸根配体。碱式乙酸铍的中心是四面体的Be4O6+,外围是乙酸根配体,每个配体都跨越一对Be2+离子[3][4]。碱式乙酸铍为钻石型网状结构英语diamondoid,包括互锁的六元素环Be2O3C,其结构相当稳定(此化合物可于330 °C蒸馏)。

Schematic structure of basic beryllium acetate

相关条目

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参考资料

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  1. ^ NIOSH Pocket Guide to Chemical Hazards. #0054. NIOSH. 
  2. ^ Moeller, T. Basic Beryllium Derivatives of Organic Acids. Audrieth, L. F. (编). Inorganic Syntheses, Volume 3. John Wiley & Sons. 1950: 4. ISBN 978-0-470-13234-0. doi:10.1002/9780470132340.ch2. 
  3. ^ William Henry Bragg, W. H. Crystal Structure of Basic Beryllium Acetate. Nature. 1923, 111 (2790): 532. Bibcode:1923Natur.111..532B. doi:10.1038/111532a0. 
  4. ^ Pauling, L.; Sherman, J. The Structure of the Carboxyl Group. II. The Crystal Structure of Basic Beryllium Acetate. Proceedings of the National Academy of Sciences. 1934, 20 (6): 340. Bibcode:1934PNAS...20..340P. doi:10.1073/pnas.20.6.340. 
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碱式乙酸铍
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