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Selective crystallisation of the polymorphs can be achieved by controlling the reaction conditions as well as the crystallisation processes. The reaction of cobalt(II) acetate tetrahydrate with 2\u2010nitrobenzoic acid followed by treatment with excesspyridine leads to a mononuclear complex with the composition [Co(H<jats:sub>2<\/jats:sub>O)<jats:sub>2<\/jats:sub>(C<jats:sub>5<\/jats:sub>H<jats:sub>5<\/jats:sub>N)<jats:sub>2<\/jats:sub>(O<jats:sub>2<\/jats:sub>CC<jats:sub>6<\/jats:sub>H<jats:sub>4<\/jats:sub>\u20102\u2010NO<jats:sub>2<\/jats:sub>)<jats:sub>2<\/jats:sub>]. (\u00a9 Wiley\u2010VCH Verlag GmbH &amp; Co. 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