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This paper describes the syntheses and crystal structures of a set of novel 2:2-type Zr IV /Hf IV -containing Keggin complexes with edge-sharing and face-sharing linkages prepared under different pH conditions, each consisting of di-Zr IV /Hf IV cluster cations sandwiched between two mono-lacunary α-Keggin polyoxometalates (POMs) with an Si heteroatom, i.e., (Et ...
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