Sequencing of metals in multivariate metal-organic frameworks

doi:10.1126/science.aaz4304

GSTDTAP > 气候变化

DOI	10.1126/science.aaz4304
	Sequencing of metals in multivariate metal-organic frameworks
	Zhe Ji; Tong Li; Omar M. Yaghi
	2020-08-07
发表期刊	Science
出版年	2020
英文摘要	Most metal-organic frameworks (MOFs) contain just one type of metal in the nodes connecting the organic linkers. Multivariate MOFs containing multiple metals can offer greater selectivity in sorption and catalytic properties, but determining the arrangement of metals in these materials is challenging. Ji et al. found that atom-probe tomography can reveal sequences of metals for MOF-74 single crystals containing combinations of cobalt, cadmium, lead, and manganese ions. In this MOF, the metals form oxide rods that are connected by the organic linker into a honeycomb lattice. The obtained sequences, which were tuned by varying the proportion of metals and synthesis temperature, could be random, short and long duplicates, and single metal insertions. Science , this issue p. [674][1] We mapped the metal sequences within crystals of metal-oxide rods in multivariate metal-organic framework–74 containing mixed combinations of cobalt (Co), cadmium (Cd), lead (Pb), and manganese (Mn). Atom probe tomography of these crystals revealed the presence of heterogeneous spatial sequences of metal ions that we describe, depending on the metal and synthesis temperature used, as random (Co, Cd, 120°C), short duplicates (Co, Cd, 85°C), long duplicates (Co, Pb, 85°C), and insertions (Co, Mn, 85°C). Three crystals were examined for each sequence type, and the molar fraction of Co among all 12 samples was observed to vary from 0.4 to 0.9, without changing the sequence type. Compared with metal oxides, metal-organic frameworks have high tolerance for coexistence of different metal sizes in their rods and therefore assume various metal sequences. [1]: /lookup/doi/10.1126/science.aaz4304
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/288007
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Zhe Ji,Tong Li,Omar M. Yaghi. Sequencing of metals in multivariate metal-organic frameworks[J]. Science,2020.
APA	Zhe Ji,Tong Li,&Omar M. Yaghi.(2020).Sequencing of metals in multivariate metal-organic frameworks.Science.
MLA	Zhe Ji,et al."Sequencing of metals in multivariate metal-organic frameworks".Science (2020).