Pressure Response of Three-Dimensional Cyanide-Bridged Bimetallic Magnets
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- 作者：Masaaki Ohba ; Wakako Kaneko ; Susumu Kitagawa ; Takuho Maeda ; Masaki Mito
- 刊名：Journal of the American Chemical Society
- 出版年：2008
- 出版时间：April 2, 2008
- 年：2008
- 卷：130
- 期：13
- 页码：4475 - 4484
- 全文大小：725K
- 年卷期：v.130,no.13(April 2, 2008)
- ISSN：1520-5126
文摘
Effects of pressure on the structures and magnetic properties of three types of 3-D cyanide-bridged bimetallic coordination polymer magnets, MnIICrIII ferrimagnet [Mn(en)]3[Cr(CN)6]2·4H2O (1; en =ethylenediamine), NiIICrIII ferromagnet [Ni(dipn)]3[Cr(CN)6]2·3H2O (2; dipn = N,N-di(3-aminopropyl)amine),and NiIIFeIII ferromagnet [Ni(dipn)]2[Ni(dipn)(H2O)][Fe(CN)6]2·11H2O (3), were systematically examined underhydrostatic pressure up to 19.8 GPa using a piston-cylinder-type pressure cell and a diamond anvil cell.The ferrimagnet 1 showed the reversible crystalline-to-amorphous-like phase change, and the magneticphase transition temperature (TC) was reversibly changed from 69 K at 0 GPa to 126 K at 4.7 GPa. Athigher pressure, the net magnetization was suppressed with increasing pressure, and the magnetic stateat 19.8 GPa was assumed to be paramagnetic. The initial ferrimagnetic phase of 1 was not recoveredafter releasing the pressure from 19.8 GPa. The magnetic phase of 2 was reversibly converted betweenferromagnetic and paramagnetic-like phase in the range 0 
P 4.7 GPa while maintaining its crystallinity.The porous ferromagnet 3 was easily amorphized and irreversibly lost the ferromagnetic phase under lowpressure (P 1.0 GPa). The flexible cyanide-bridged magnetic frameworks demonstrate well the pressureresponse as a reflection of differences in the magnetic structure and the framework strength in the GParange.
P 4.7 GPa while maintaining its crystallinity.The porous ferromagnet 3 was easily amorphized and irreversibly lost the ferromagnetic phase under lowpressure (P 1.0 GPa). The flexible cyanide-bridged magnetic frameworks demonstrate well the pressureresponse as a reflection of differences in the magnetic structure and the framework strength in the GParange.