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Two new lanthanide coordination polymers [Ln(C 5 H 2 N 2 O 4)(H 2 O) 2 (C 2 O 4) 0.5 ] n nH 2 O (Ln=Ce III (1) or Pr III (2);C 5 H 2 N 2 O 4=imidazole-4,5-dicarboxylate anion;C 2 O 4=oxalate anion) have been synthesized and structurally characterized by single-crystal X-ray diffraction,elemental analyses and IR spectrum.Both compounds crystallize in monoclinic,space group P2 1 /c with a=7.5225(3),b=17.2416(6),c=8.6089(3),β=110.9610(10)°,V=1042.68(7)3,Z=4,C 6 H 8 N 2 O 9 Ce,M r=392.26,D c=2.499 g/cm 3,μ(MoKα)=4.414 mm 1,F(000)=752,the final R=0.0167 and wR=0.0412 for 1;a=7.4973(3),b=17.2113(8),c=8.5729(4),β=110.9440(10)°,V=1033.14(8)3,Z=4,C 6 H 8 N 2 O 9 Pr,M r=393.05,D c=2.527 g/cm 3,μ(MoKα)=4.764 mm 1,F(000)=756,the final R=0.0192 and wR=0.0455 for 2.X-ray diffraction analyses reveal that the lanthanide cations in compound 1 or 2 are linked by imidazole-4,5-dicarboxylate and in situ generated oxalate anions via Ln-O and Ln-N covalent bonds to form two-dimensional layered networks.The successful synthesis of compound 1 or 2 also indicates a crystallographic confirmation for the decomposition of curcumin to form oxalate anion under solvothermal conditions.
Two new lanthanide coordination polymers [Ln (C 5 H 2 N 2 O 4) (H 2 O) 2 (C 2 O 4) 0.5] n nH 2 O (Ln = Ce III (1) or Pr III C 5 H 2 N 2 O 4 = imidazole-4,5-dicarboxylate anion; C 2 O 4 = oxalate anion) have been synthesized and structurally characterized by single-crystal X-ray diffraction, elemental analyzes and IR spectrum. Both compounds crystallize in monoclinic space group P2 1 / c with a = 7.5225 (3), b = 17.2416 (6), c = 8.6089 (3) β, β = 110.9610 (10) °, V = 1042.68 = 4, C6H8N2O9Ce, M r = 392.26, D c = 2.499 g / cm 3, μ (MoKα) = 4.414 mm 1, F (000) = 752, the final R = 0.0167 and wR = 0.0412 for 1; a = 7.4973 (3), b = 17.2113 (8), c = 8.5729 (4) β, β = 110.9440 (10) °, V = 1033.14 H 8 N 2 O 9 Pr, M r = 393.05, D c = 2.527 g / cm 3, μ (MoKα) = 4.764 mm 1, F (000) = 756, the final R = 0.0192 and wR = 0.0455 for 2. X-ray diffraction analyzes that reveal the lanthanide cations in compound 1 or 2 are linked by imidazole-4,5-dicarboxylate and in situ generated oxalate anions via Ln-O and Ln-N covalent bonds to form two-dimensional l aired networks. The successful synthesis of compound 1 or 2 also indicates a crystallographic confirmation for the decomposition of curcumin to form oxalate anion under solvothermal conditions.