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Three zinc(II) phosphonate cluster compounds have been hydrothermally synthesized and structurally characterized. Compound 1 consists of a centered {Zn 6 (Zn)L 6 } 4− core and two {Zn(Phen) 2 (H 2 O) 2 } 2+ countercations (L = N -(phosphonomethyl)pipecolinic acid, O 3 PCH 2 −NC 5 H 9 −CO 2 ). The {Zn 6 (Zn)L 6 } 4− core in compound 2 or 3 is covalently bonded to two Zn(H 2 O) 4 2+ or {Zn(2,2′-bipy)(H 2 O) 3 } 2+ cations through the coordination of two additional carboxylate oxygen atoms to form a nonanuclear cluster.
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Guo et al. (2008) studied this question.
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