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One new mixed-valence heptanuclear manganese complex,[Mn11Mn1116O2L6-(NaCH3COO)2(CH3COO)4](1)(L = 3-ethoxy-6-(((2-hydroxyethyl)imino)methyl)phenol,was synthesized by treating the Schiff-base ligand with Mn(acac)3·4H20 and characterized by ele-mental analysis,IR spectra,thermogravimetric analyses and X-ray single-crystal diffraction.1 has a similar new mixed-valence heptanuclear structure.The magnetic measurements indicate that 1 exhibits the antiferromagnetic interactions.