Field-Induced Ferromagnetism and Multiferroic Behavior in End-on Pseudohalide-Bridged Dinuclear Copper(II) Complexes with Tridentate Schiff Base Blocking Ligands
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- 作者：Subrata Jana ; Bikash Kumar Shaw ; Prasanta Bhowmik ; Klaus Harms ; Michael G. B. Drew ; Shouvik Chattopadhyay ; Shyamal Kumar Saha
- 刊名：Inorganic Chemistry
- 出版年：2014
- 出版时间：August 18, 2014
- 年：2014
- 卷：53
- 期：16
- 页码：8723-8734
- 全文大小：656K
- ISSN：1520-510X
文摘
Four new end-on pseudohalide-bridged dinuclear copper(II) complexes, [Cu2(L1)2(N3)2]路DMF (1), [Cu2(L2)2(N3)2] (2), [Cu2(L3)2(NCS)2] (3), and [Cu2(L4)2(N3)2] (4) {where HL1, HL2, HL3, and HL4 are tridentate N2O donor Schiff bases}, are synthesized and characterized. Complexes 1, 2, and 3 possess 蟺路路路蟺 stacking interactions, while in addition hydrogen-bonding interactions are present in 1 and 3. However, by contrast, complex 4 contains neither type of interaction. Field-induced long-range ferromagnetic ordering beyond 0.9 T is observed in complexes 1 and 2 due to 蟺路路路蟺 stacking interactions, while ferroelectric ordering is observed in complexes 1 and 3 due to hydrogen-bonding interactions. Most interestingly, complex 1, which contains both 蟺路路路蟺 stacking and hydrogen-bonding interactions, shows multiferroic behavior as a result of coupling between the dielectric and magnetic fields with 8% change in the magneto鈥揹ielectric effect at room temperature. We believe that from this study will emerge a new class of multiferroic materials.