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Series of coordination polymers,{[Ln(H4aobtc)(H2O)4·bipy]·H2O}n(H4aobtc =azoxybenzene-2,2,3,3-tetracarboxylic acid,bipy = 4,4-bipyridine,and Ln = Pr(1),Eu(2),Gd(3),Tb(4),Dy(5),Er(6)have been afforded and characterized systematically.