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A novel pyrazine-2,3-dicarboxylic acid bridged Co(Ⅱ) phen complex 2∞ [Co-(phen)(μ-L)3/3]·H2O (H2L = pyrazine-2,3-dicarboxylic acid) has been hydrothermally synthesized,and X-ray single-crystal diffraction analysis shows that it crystallizes in the mo