Reaction of a molecular Co(ii) maleate, [Co(Hmal)2(H 2O)4], with pyridine yields a Co(ii) fumarate, [Co(fum)(H2O)4], with a chain structure and a chiral pyridylsuccinic acid zwitter ion, -OOC-CH(N+C 5H5)-CH2-COOH, in almost quantitative yields, while the reaction of 4,4′-bipyridine (bipy) with the Co(ii) maleate, on the other hand, almost quantitatively generates a polylmeric Co(ii) maleate, [Co(mal)(bipy)]n•(n/2)H2O along with the adduct of fumaric acid with bipyridine. © The Royal Society of Chemistry.
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Prof. M. Padmanabhan, J.C. Joseph, A. Thirumurugan, and C.N.R. Rao, “Maleate-fumarate conversion and other novel aspects of the reaction of a Co(ii) maleate with pyridine and bipyridine”, Dalton Transactions, pp. 2809-2811, 2008.