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Nanostructures of three new cobalt(II) complexes, (CoL1)·0.5DMF·1.5MeOH (1), [H2L1=5-(4-Carboxy phenyl azo) anthranilic acid], (Co(L2)2)·1.5MeOH (2), [HL2=5-(4-Carboxy phenyl azo) salicylaldehyde] and (Co(L3)2)·0.5DMF·0.5MeOH (3), [HL3=1-(4-Carboxy phenyl azo) 2-naphtol], have been synthesized by the reaction of H2L1, HL2 and HL3 with Co(OAc)2·4H2O through sonochemical process. Calcination of the...