Abstract
Three new Cu(Ⅱ)-Ln(Ⅲ) heterometallic coordination polymers based on two N -heterocyclic carboxylic ligands, {[LnCu(L 1 ) 2 (L 2 )(H 2 O) 2 ]·mH 2 O} n (Ln = La( 1 ), Nd( 2 ), Gd( 3 ), m = 2 (for 1), 1 (for 2, 3), H 2 L 1 = quinolinic acid, HL 2 = nicotinic acid), have been synthesized and characterized. 1 has a two-dimensional (2D) layer structure with a Schlafli symbol of (4 4 .6 2 ), while complexes 2 and 3 are isostructural and have three-dimensional (3D) structures with a Schl?fli symbol of (3.4.5) 2 (3 2 .4 2 .5 2 .6 14 .7 4 .8 3 .9)(3 2 .6 3 .7) of 3-nodal net. Magnetic investigations suggest that antiferromagnetic coupling exists between Nd Ⅲ and Cu Ⅱ in 2 , while weak ferromagnetic coupling between Gd Ⅲ and Cu Ⅱ in 3 . The difference of magnetic properties between 2 and 3 has been discussed.
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