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Cobalt–Lanthanide Coordination Polymers Constructed with Metalloligands: A Ferromagnetic Coupled Quasi‐1D Dy 3+ Chain Showing Slow Relaxation
Author(s) -
Huang YouGui,
Wang XiuTeng,
Jiang FeiLong,
Gao Song,
Wu MingYan,
Gao Qiang,
Wei Wei,
Hong MaoChun
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200800344
Subject(s) - carboxylate , crystallography , lanthanide , coordination polymer , chemistry , ferromagnetism , cobalt , ligand (biochemistry) , pyridine , magnetic susceptibility , chain (unit) , stereochemistry , materials science , crystal structure , inorganic chemistry , ion , medicinal chemistry , physics , organic chemistry , biochemistry , receptor , astronomy , quantum mechanics
Four types of cobalt–lanthanide heterometallic compounds based on metalloligand Co(2,5‐pydc) 3 3− (2,5‐H 2 pydc=pyridine‐2,5‐dicarboxylate acid), [Ln 2 Co 2 (2,5‐pydc) 6 (H 2 O) 4 ] n ⋅ 2 n H 2 O ( 1 ) (Ln=Tb, Dy for 1 a , 1 b respectively), [Tb 2 Co 2 (2,5‐pydc) 6 (H 2 O) 4 ] n ⋅ 3 n H 2 O ( 2 ), [Tb 2 Co 2 (2,5‐pydc) 6 (H 2 O) 9 ] n ⋅ 4 n H 2 O ( 3 ), and [LaCo(2,5‐pydc) 3 (H 2 O) 2 ] n ⋅ 2 n H 2 O ( 4 ) have been synthesized. Compound 1 has a layer structure with well‐isolated carboxylate‐bridged Ln 3+ chains, compound 2 is a three‐dimensional (3D) porous network with Tb 3+ chains that are also well isolated and carboxylate bridged, 3 is a layer structure based on dinuclear units, and 4 is a 3D network with boron nitride (BN) topology. DC magnetic studies reveal ferromagnetic coupling in all the carboxylate‐bridged Ln 3+ chains in 1 a , 1 b , and 2 . Compared to the silence of the out‐of‐phase ac susceptibility of 2 , above 1.9 K the magnetic relaxation behavior of both 1 a and 1 b is slow like that of a single‐chain magnet.