Cobalt–Lanthanide Coordination Polymers Constructed with Metalloligands: A Ferromagnetic Coupled Quasi-1D Dy3+ Chain Showing Slow Relaxation
✍ Scribed by You-Gui Huang; Xiu-Teng Wang; Fei-Long Jiang; Song Gao; Ming-Yan Wu; Qiang Gao; Wei Wei; Mao-Chun Hong
- Book ID
- 102793998
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 916 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0947-6539
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✦ Synopsis
Abstract
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.