Three new Cu(Ⅱ)-Ln(Ⅲ) heterometallic coordination polymers constructed from quinolinic acid and nico

• 出 处: Science China(Chemistry)
• 发表日期: 2012年06期
• 关键词: nicotinic Ln Synthesis Three new Cu structures ferromagnetic symbol heterocyclic

Three new Cu(Ⅱ)-Ln(Ⅲ) heterometallic coordination polymers based on two N-heterocyclic carboxylic ligands, {[LnCu(L1)2(L2)(H2O)2]·mH2O}n (Ln = La(1), Nd(2), Gd(3), m = 2 (for 1), 1 (for 2, 3), H2L1 = quinolinic acid, HL2 = nicotinic acid), have been synthesized and characterized. 1 has a two-dimensional (2D) layer structure with a Schlfli symbol of (44.62), while complexes 2 and 3 are isostructural and have three-dimensional (3D) structures with a Schlfli symbol of (3.4.5)2(32.42.52.614.74.83.9)(32.63.7) of 3-nodal net. Magnetic investigations suggest that antiferromagnetic coupling exists between NdIII and CuII in 2, while weak ferromagnetic coupling between GdIII and CuII in 3. The difference of magnetic properties between 2 and 3 has been discussed.

Three new Cu (Ⅱ) -Ln (Ⅲ) heterometallic coordination polymers based on two N-heterocyclic carboxylic ligands, {[LnCu (L1) 2 (L2) (H2O) 2] · mH2O} n (Ln = La Has a two-dimensional (Nd (2), Gd (3), m = 2 for 1, for 2, 3, H2L1 = quinolinic acid, 2D) layer structure with a Schlfli symbol of (44.62), while complexes 2 and 3 are isostructural and have three-dimensional (3D) structures with a Schlfli symbol of (3.4.5) 2 (32.42.52.614.74.83 .9) (32.63.7) of 3-nodal net. Magnetic guidance suggests that antiferromagnetic coupling exists between NdIII and CuII in 2 while weak ferromagnetic coupling between GdIII and CuII in 3. The difference of magnetic properties between 2 and 3 has been discussed.