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The hydro(solvo)thermal reactions of cobalt powder or its chloride with 2,5-pyridine dicarboxylic acid (H2PYDC) yielded two new complexes: [Co(Ⅱ)2(PYDC)2(H2O)2-(H2O)4]n 1 and { Co(Ⅱ)[NH2(CH3)2]2(PYDC)2 }n 2. It is observed that the reactive solvents resul