Chelating ligands xanthate structures

There are two polymorphic forms of Zn(S2CO— -Pr)2(phen) (164), both monoclinic with space group P2 ln, and the molecular structures for these are shown in Figs. 88 and 89, respectively. In polymorphic form I, Fig. 88, one of the xanthate ligands is clearly chelating forming Zn—SI and Zn S2 bond... 

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