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Title: Synthetic Control of Thorium Polyoxo-Clusters in Metal–Organic Frameworks toward New Thorium-Based Materials

Journal Article · · ACS Applied Nano Materials

Control over the assembly of thorium-based polyoxo-clusters remains a great challenge because of their quick olation and oxolation reactions. Here, we report the synthesis and isolation of two pure phase thorium polyoxocluster-based metal-organic frameworks (Th-MOFs), ThNU-1008 and Th-NU-1011. Crystal structures of these ThMOFs reveal two distinct 8-connected polyoxo-clusters: a hexanuclear cluster [Th63-O)4(OH)4(H2O)6(HCOO)4] was observed in Th-NU-1008 and a tetranuclear cluster [Th43-)2(OH)4(DMF)2(H2O)4] in Th-NU-1011 which has never been reported before among thorium species. In both Th-NU-1008 and Th-NU-1011, the tetratopic linker, 1,4-dibromo-2,3,5,6-tetrakis(4-carboxyphenyl) benzene, joins the clusters together, forming two three-periodic networks, each with csq topology. The Brunauer-Emmett-Teller (BET) surface areas calculated from the Ar isotherms are approximately 800 and 700 m2 g-1 for Th-NU-1008 and Th-NU-1011, respectively. Because the linkers are oriented orthogonal to each other in the two respective MOFs, a 32 Å hexagonal channel is observed in Th-NU-1008 while a 15 Å channel is observed in Th-NU-1011. This work opens a new avenue to construct unexplored Th-MOF materials with targeted polyoxo-cluster structures.

Research Organization:
University of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003763
OSTI ID:
1502932
Journal Information:
ACS Applied Nano Materials, Vol. 2, Issue 4; ISSN 2574-0970
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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