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Extended Structures and Magnetic Properties of Lanthanide–Copper Complexes with Picolinic Acids as Bridging Ligands
Author(s) -
Wu AQing,
Guo GuangHua,
Yang Chun,
Zheng FaKun,
Liu Xi,
Guo GuoCong,
Huang JinShun,
Dong ZhenChao,
Takano Yoshihiko
Publication year - 2005
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200400679
Subject(s) - chemistry , crystallography , lanthanide , picolinic acid , copper , zigzag , paramagnetism , ion , stereochemistry , geometry , physics , mathematics , organic chemistry , quantum mechanics
The first examples of 3d–4f heterometallic complexes containing picolinic acid ligands were synthesized and characterized. Three series of complexes were obtained by the reaction of presynthesized “metallo ligands” Cu(pic) 2 and Ln(ClO 4 ) 3 in 2:1, 3:1, and 4:1 mole ratios. Complexes 1 – 3 ( denoted as the first series ) , [LnCu 2 (pic) 4 (H 2 O) 6 ](ClO 4 ) 3 · H 2 O (Ln = Sm, Nd, and Pr), are isomorphous and exhibit infinite 1D zigzag chain structures with rare earth ions in tricapped trigonal prismatic coordination. Complexes 4 – 10 (denoted as the second series), [Ln 2 Cu 5 (pic) 10 (H 2 O) 8 ](ClO 4 ) 6 · 2H 2 O (Ln = Gd, Nd, Sm , Dy, Eu, Pr, and Yb), are isomorphous too, and exhibit extended 2D layered structures constituted by Cu(pic) 2 moieties bridging the zigzag chains. Complex 11 ( denoted as the third‐type complex ) , {NdCu(pic) 2 [CO(NH 2 ) 2 ] 4 (H 2 O) 3 }(ClO 4 ) 3 · [Cu(pic) 2 ] 2 , exhibits another type of nearly linear chain structure with additional Cu(pic) 2 moieties trapped in the lattice by hydrogen bonds. Temperature‐dependent magnetizations of complexes 2 – 4 , 6 , and 11 indicate that these complexes follow the Curie–Weiss paramagnetic behavior down to 5 K. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)