在多变体金属有机框架中对金属进行测序
Zhe Ji1,2,3,4, Tong Li5, Omar M Yaghi6,2,3,4,7
1Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA.
概括
研究人员在金属-有机框架-74晶体中绘制了金属序列. 不同的合成条件产生了多样化的金属离子排列,显示MOF
科学领域:
- 材料科学
- 化学学
- 纳米技术
背景情况:
- 金属有机框架 (MOF) 是具有调节性质的多功能多孔材料.
- 含有多种金属离子的多变量MOF提供了增强的功能.
- 了解MOF中的金属离子分布对于设计先进材料至关重要.
研究的目的:
- 研究多变金属有机框架-74 (MOF-74) 晶体中的不同金属离子的空间排列.
- 将合成条件 (温度,金属类型) 与观察到的金属序列模式相关联.
- 在混合金属MOF-74中描述金属序列的异质性.
主要方法:
- 多变量MOF-74晶体与 (Co), (Cd), (Pb) 和 (Mn) 的组合的合成.
- 原子探头断层扫描 (APT) 用于空间绘制MOF晶体内的金属离子分布.
- 基于不同合成温度和金属组成的金属序列分析.
主要成果:
- 确定了四种不同的金属序列类型:随机 (Co,Cd,120°C),短重复 (Co,Cd,85°C),长重复 (Co,Pb,85°C) 和插入 (Co,Mn,85°C).
- 在不改变序列类型的样本中,的摩尔分数从0.4到0.9不等.
- MOF-74对不同大小的金属离子具有很高的耐受性,使其能够形成多样化的序列.
结论:
- 合成条件显著影响多变量MOF-74中的金属离子的空间排列.
- 原子探针断层扫描有效地阐明了MOF结构中的复杂金属离子排序.
- MOF-74的结构灵活性允许形成各种异质金属序列,为量身定制的材料设计打开了道路.
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