4.7 Article

Halogen bonding in uranyl and neptunyl trichloroacetates with alkali metals and improved crystal chemical formulae for coordination compounds

Journal

DALTON TRANSACTIONS
Volume 50, Issue 12, Pages 4210-4218

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d0dt04083e

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Funding

  1. Russian Science Foundation [20-73-10250]
  2. Russian Science Foundation [20-73-10250] Funding Source: Russian Science Foundation

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The single crystal structures of compounds I to IV were established using X-ray diffraction analysis. Compounds II to IV exhibit a framework structure, while compound I has a layered structure with perfect cleavage along the (001) plane. The halogen bonds in all title compounds were characterized using the method of molecular Voronoi-Dirichlet polyhedra.
The structures of the single crystals of compounds K2UO2(tca)(4)(tcaH)(2) (I), K4NpO2(tca)(6)(tcaH)(H2O)(3) (II), Rb4UO2(tca)(6)(tcaH)(H2O)(3) (III), and Cs3UO2(tca)(5)(tcaH)(2)center dot H2O (IV), where tca is the trichloroacetate ion, were established by X-ray diffraction analysis. The crystals of II-IV have a framework structure, whereas in the layered crystals of I, neighboring layers are connected to each other via halogen bonds. In this regard, the crystals of I possess perfect cleavage along the (001) plane: the crystals are easily cut into stacks of very thin layers. Halogen bonds in the structures of all title compounds were characterized using the method of molecular Voronoi-Dirichlet polyhedra. The donor-acceptor halogen bond synthon, where the same halogen atom is both the donor towards one halogen atom and the acceptor from the second halogen atom, is recognized for its usefulness in the crystal design. The description of the ligand coordination modes and crystal chemical formulae of complexes is adapted for cases when ligands have chemically non-equivalent and unobvious donor atoms (for example, oxygen and halogen atoms in halogen-substituted carboxylate anions).

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