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Two new metal-organic frameworks, [Co3L2(NO2)2 (H2O)2]n (1) and{[Ni(L)(H2O)5 ]·(H2O)2 ·DMF}n(2, H2 L = 5-(4-pyridyl)-methoxyl isophthalic acid), have been synthesized by the hydrothermal method and characterized by elemental analysis, infrared s