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Co(NO3) 2, N-carbazolyacetic acid and 4, 4'-bipyridyl can give rise to a novel coordination polymer[Co2(Cabo)2(NO3)2(4, 4'-bipy)2] n using a fritted U-tube. Single crystal X-ray diffraction displays in the complex, each Co (Ⅱ) is six-coordinated by two N atoms from different 4, 4'-bipyridyl ligands, two O atoms of the bridge from two N-carbazolyacetic acid and two O atoms of one nitrate anion to form a distorted octahedral. Two O atoms of the carboxyl group act as bridge to link two Co (Ⅱ) atoms. The resulting structure is a ladder polymer.