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Psuedosymmetry and pseudomerodry or nonmerohedral twinning for the known structure of di aqua bis(quinolin-8-olato-κ N,O)zinc(II)

Acta Crystallographica Section C: Crystal Structure Communications, ISSN: 0108-2701, Vol: 69, Issue: 8, Page: 868-871
2013
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The structure of the title centrosymmetric compound, [Zn(C9H6NO)2(H2O)2], has already been solved three times [Merritt, Cady & Mundy (1954). Acta Cryst. 7, 473-476; Palenik (1964). Acta Cryst. 17, 696-700; Chen, Zhang, Shi, Huang, Liang & Zhou (2003). Acta Cryst. E59, m814-m815]. The authors of the two most recent papers state that they attained lower R1 values than that obtained in the 1954 paper, but they do not mention that Merritt et al. had derived the structural model from a twinned crystal. Also, from a structural point of view, there are strong indications that the most recent report is in fact the isostructural Cu complex already reported by Okabe & Saishu [Acta Cryst. (2001), E57, m251-m252] and not the Zn complex. The structure of the title compound is reported here based on data obtained from a twinned crystal. © 2013 International Union of Crystallography.

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