Crystal Chemistry of Uranyl Halides Containing Mixed (UO2)(XmOn)5 Bipyramids (X = Cl, Br): Synthesis and Crystal Structure of Cs2(UO2)(NO3)Cl3
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چکیده
Single crystals of Cs2(UO2)(NO3)Cl3 were prepared by a hydrothermal method at 205 ◦C. The crystal structure has been solved by Direct Methods: monoclinic, P21/n, a = 10.3748(13), b = 9.4683(13), c = 12.5535(16) Å, β = 110.280(2)◦ , V = 1156.7(3) Å3, R1 = 0.029. In the structure, strongly bonded linear uranyl cations UO2 are equatorially coordinated by two O and three Cl atoms to form (UO2)Cl3O2 pentagonal bipyramids. Each bipyramid shares its O–O edge with an adjacent (NO3)− anion to form finite clusters with the chemical composition [(UO2)(NO3)Cl3]2−. The Cs+ cations provide three-dimensional connectivity of the structure by forming Cs–O and Cs–Cl contacts to the uranyl nitrate chloride complexes. Related structures of mixed-ligand uranyl halides are compared.
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