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The crystal structure of erbium (Ⅲ) complex of 1,3,5-benzenetricar-boxylic acid is reported. The title compound crystallizes in triclinic space group of P1 and cell parameters a = 7. 649(3) ,b= 9. 859(2) ,c= 11. 171 (3) A ;α= 106. 90(2),β= 104. 40(3),γ=107. 20(3)°;Z = 2;V = 716. 5A3.The final R and Rw are 0. 0328 and 0. 0338 respectively. The rare earth ion is nine-coordinated by four oxygen atoms from two carboxylato groups in two 1, 3, 5- benzenetricarboxylato groups and five aqua molecules, forming a distorted monocapped square antiprism. The Er-O distances fall in the range of 2. 327-2. 627A.
The title structure crystallizes in a triclinic space group of P1 and cell parameters a = 7. 649 (3), b = 9. 859 (2), c = 11. 171 (3) A; α = 106. 90 (2), β = 104.40 (3), γ = 107.20 (3) °; Z = 2; V = 716. 5A3. The final R and Rw are 0. 0328 and 0. 0338 respectively. The rare earth ion is nine-coordinated by four oxygen atoms from two carboxylato groups in two 1, 3, 5-benzenetricarboxylato groups and five aqua molecules, forming a distorted monocapped square antiprism. The Er-O distances fall in the range of 2. 327-2. 627A.