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Left: Modelled coordination of Zr4+ by DFO (11);20 Centre: Schematic structure of ZrL4 (HL = N-methylacetohydroxamic acid) (12), serving as a template for the design of new octadentate chelators for Zr+ (note that disorder in the C and N orientations of the hydroxamate rings precludes determination of their preferred relative orientation and suggests that any such preferences are weak);22 Right: Schematic structure of Zr4+ complex 13 of an octadentate DFO homologue.23
