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The proligand citric acid has been used to assemble two new anionic NiII clusters, [Ni7(cit)6(H2O)2]10− and [Ni21(cit)12(OH)10(H2O)10]16− (see picture; Ni=black spheres), from basic aqueous solution. The former possesses a high-spin S=7 ground state, while the latter shows predominantly antiferromagnetic exchange.
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Murrie et al. (2001) studied this question.
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