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Title: X-ray Crystal Structure of Thorium Tetrahydroborate, Th(BH4)4, and Computational Studies of An(BH4)4 (An = Th, U)

Journal Article · · Inorganic Chemistry
 [1];  [2];  [3]; ORCiD logo [2]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); University of Illinois at Urbana-Champaign
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)
  3. Univ. of Minnesota, Minneapolis, MN (United States)

Here the crystal structure of Th(BH4)4 is described. Two of the four BH4 ions are terminal and tridentate (κ3), whereas the other two bridge between neighboring ThIV centers in a κ22 (i.e., bis-bidentate) fashion. Thus, each thorium center is bound to six BH4 groups by 14 Th–H bonds. The six boron atoms describe a distorted octahedron in which the κ3-BH4 ions are mutually cis; the 14 ligating hydrogen atoms define a highly distorted bicapped hexagonal antiprism. The thorium centers are linked into a polymer consisting of interconnected helical chains wound about 4-fold screw axes. The structures of An(BH4)4 (An = Th, U) were also investigated by DFT. The geometries of [An(BH4)6]2–, [An3(BH4)16]4–, and [An5(BH4)26]6– fragments of the polymeric structures were optimized at the B3LYP and/or PBE levels. Most calculated geometries are 14-coordinate and agree with the experimental structures, but isolated [Th(BH4)6]2– units are predicted to feature 16-coordinate ThIV centers.

Research Organization:
University of Illinois at Urbana-Champaign, Urbana, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
SC0019021; SC0019426
OSTI ID:
1903739
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 16 Vol. 60; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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