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The reactions of 4-pyrimidin-5-ylbenzoic acid (HL) with Co(NO3)2·6H2O and Ni(NO3)2·6H2O gave rise to two isomorphous mononuclear coordination complexes, namely, [CoL2(H2O)4] (1) and [NiL2(H2O)4] (2). Both compounds were characterized by IR spect