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Iron aggregates are arranged into a close-packed structure through coordination bonds to give a material that displays a structural and magnetic hierarchy. The tripodal proligand nitrilotripropionic acid (H3ntp=N(CH2CH2COOH)3) successfully traps {Fe13} aggregates, thus producing a lattice that displays three levels of organization (see picture of its 3D packing arrangement; Fe green; O red; N blue; C black; H white).
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Murugesu et al. (2005) studied this question.
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