TY - JOUR
T1 - Structures and magnetism of cyano-bridged grid-like two-dimensional 4f-3d arrays
AU - Zhang, Yuan Zhu
AU - Duan, Gong Ping
AU - Sato, Osamu
AU - Gao, Song
PY - 2006
Y1 - 2006
N2 - With the introduction of 4,4′-bipyridine N,N′-dioxide (bpdo) ligands, six novel cyano/bpdo mixed-bridged heterometallic 4f-3d compounds {{Ln(iii)(bpdo)(H2O)2M(iii)(CN)6} ·2H2O}n (Ln = Nd(1), Sm(2), Gd(3), Tb(4) with M = Fe; Ln = Nd(5), Sm(6) with M = Co) have been prepared. X-Ray crystallography revealed that they have the same two-dimensional molecular structures, where each [M(CN)6]3- unit uses four co-planar cyanide groups to connect with four square anti-prism Ln3+ ions and, accordingly, each Ln3+ ion links four [M(CN)6]3- units, giving a corrugated grid-like layer and, simultaneously, the next nearest Ln 3+ ions are bridged by bpdo in the diagonal direction. Magnetic studies showed that the Ln3+-Fe3+ interaction is ferromagnetic for NdFe (1), antiferromagnetic for SmFe (2) and GdFe (3), while negligible for TbFe (4). Especially, 2 and 3 exhibited ferrimagnetic orderings below 2.9 and 1.9 K, respectively, with a coercive field of 40 Oe at 1.8 K for 2. Additionally, 5 showed an unusual field-induced magnetization relaxation.
AB - With the introduction of 4,4′-bipyridine N,N′-dioxide (bpdo) ligands, six novel cyano/bpdo mixed-bridged heterometallic 4f-3d compounds {{Ln(iii)(bpdo)(H2O)2M(iii)(CN)6} ·2H2O}n (Ln = Nd(1), Sm(2), Gd(3), Tb(4) with M = Fe; Ln = Nd(5), Sm(6) with M = Co) have been prepared. X-Ray crystallography revealed that they have the same two-dimensional molecular structures, where each [M(CN)6]3- unit uses four co-planar cyanide groups to connect with four square anti-prism Ln3+ ions and, accordingly, each Ln3+ ion links four [M(CN)6]3- units, giving a corrugated grid-like layer and, simultaneously, the next nearest Ln 3+ ions are bridged by bpdo in the diagonal direction. Magnetic studies showed that the Ln3+-Fe3+ interaction is ferromagnetic for NdFe (1), antiferromagnetic for SmFe (2) and GdFe (3), while negligible for TbFe (4). Especially, 2 and 3 exhibited ferrimagnetic orderings below 2.9 and 1.9 K, respectively, with a coercive field of 40 Oe at 1.8 K for 2. Additionally, 5 showed an unusual field-induced magnetization relaxation.
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U2 - 10.1039/b603050e
DO - 10.1039/b603050e
M3 - Article
AN - SCOPUS:33745641526
VL - 16
SP - 2625
EP - 2634
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
SN - 0959-9428
IS - 26
ER -