Salen‐Type Triple‐Decker Trinuclear Dy3 Complexes Showing Slow Magnetic Relaxation Behavior
Salen‐Type Triple‐Decker Trinuclear Dy3 Complexes Showing Slow Magnetic Relaxation Behavior
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DOI：
10.1002/ejic.201200357
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发表时间：
2012-09
影响因子：
2.3
通讯作者：
Fan Yang;Pengfei Yan;Quan Li;Peng Chen;Guangming Li
中科院分区：
文献类型：
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作者：
Fan Yang;Pengfei Yan;Quan Li;Peng Chen;Guangming Li
用四齿Salen型配体(H_2La)与Dy(NO)_3·6H_2O和六齿Salen型配体(H_2Lb)与Dy(NO)_3·6H_2O反应，合成了两个新的Dy3夹心配合物[Dy3La(CH_3OH)_2(NO)_3]·CH_2Cl2·CH_3OH·2H_2O[1，H_2La=N，N‘-双(水杨醛)-1，2-苯二胺]和[Dy3Lb(OAc)_3]·3CH3OH·H_2O[2，H_2Lb=N，N′-bis(3-methoxysalicylidene)-1，2-phenylenediamine]，]。X-射线晶体分析表明，1和2都具有类似的新的三层三核夹心结构。磁性研究表明，1在Dy3+离子之间表现出反铁磁相互作用，而2在自旋载流子之间表现出铁磁相互作用。虽然1和2都表现出缓慢的磁弛豫行为，但在2中观察到了两个弛豫过程，这是对最近报道的纯4f型单分子磁体(SMM)的扩展。
Two new Dy3 sandwich complexes, namely, [Dy3La3(CH3OH)2(NO3)3]·CH2Cl2·CH3OH·2H2O [1, H2La = N,N′-bis(salicylidene)-1,2-phenylenediamine] and [Dy3Lb3(OAc)3]·3CH3OH·H2O [2, H2Lb = N,N′-bis(3-methoxysalicylidene)-1,2-phenylenediamine], have been synthesized from the reactions of a tetradentate salen-type ligand (H2La) with Dy(NO)3·6H2O and a hexadentate salen-type ligand (H2Lb) with Dy(OAc)3·6H2O. X-ray crystallographic analysis reveals that both 1 and 2 have a similar new triple-decker trinuclear sandwich structure. Magnetic studies indicate that 1 exhibits an antiferromagnetic interaction between the Dy3+ ions, whereas 2 exhibits a ferromagnetic interaction between spin carriers. Although both 1 and 2 display slow magnetic relaxation behavior, two relaxation processes were observed in 2, which expand on the recent reports of pure 4f-type single molecule magnets (SMMs).