The first anion-exchangeable framework hydroxide, Yb(3)O(OH)(6)Cl·2H(2)O, has been synthesized hydrothermally. This material has a three-dimensional cationic ytterbium oxyhydroxide framework with one-dimensional channels running through the structure in which the chloride anions and water molecules are located. The framework is thermally stable below 200 °C and can be reversibly dehydrated and rehydrated with no loss of crystallinity. Additionally, it is able to undergo anion-exchange reactions with small ions such as carbonate, oxalate, and succinate with retention of the framework structure.
Layers. -The new compounds (III), (VI), and (VIII) are hydrothermally prepared (35-60% yield) and characterized by single crystal XRD. (IIIa) crystallizes in the monoclinic space group C2/c with Z = 8 and (IIIb) and (VIb) in the monoclinic space group P21/c with Z = 2. For (VIa) two polymorphs are obtained which crystallize in the monoclinic space group C2/c with Z = 8 and in the triclinic space group P1 with Z = 1, respectively. (VIII) has a triclinic structure (P1, Z = 2). The compounds contain positively charged two-dimensional inorganic mixed-metal oxide layers which are charge-balanced by pillaring organic dianions. The triclinic polymorph of (VIa) contains a unique dimeric W2 anion which comprises two square-based pyramidal tungsten centers opposed to each other.
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