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One-pot solvothermal treatments of Er(NO3)3·6H2O,HL(4-[3-methyl-5-(pyridin-4-yl)-1,2,4-triazol-4-yl]benzoic acid)and H2tpa(terephthalic acid)in H2O/CH3CN(V/V=1:1)yielded a 2D network,[Er(L)(tpa)(H2O)2]n·2n H2O(1).