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A tetranuclear erbium complex with pyridine-2,4,6-tricarboxylic acid(H3ptc), [Er4(ptc)4(H2O)18]·6H2O(1), has been synthesized by hydrothermal method. The complex crystallizes in triclinic system, space group P1, with a = 7.620(2), b = 10.459(3), c =