Document Detail

Pressure response of three-dimensional cyanide-bridged bimetallic magnets.
MedLine Citation:
PMID:  18331039     Owner:  NLM     Status:  MEDLINE    
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 under hydrostatic 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 magnetic phase transition temperature (TC) was reversibly changed from 69 K at 0 GPa to 126 K at 4.7 GPa. At higher pressure, the net magnetization was suppressed with increasing pressure, and the magnetic state at 19.8 GPa was assumed to be paramagnetic. The initial ferrimagnetic phase of 1 was not recovered after releasing the pressure from 19.8 GPa. The magnetic phase of 2 was reversibly converted between ferromagnetic 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 low pressure (P </= 1.0 GPa). The flexible cyanide-bridged magnetic frameworks demonstrate well the pressure response as a reflection of differences in the magnetic structure and the framework strength in the GPa range.
Masaaki Ohba; Wakako Kaneko; Susumu Kitagawa; Takuho Maeda; Masaki Mito
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-03-11
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  130     ISSN:  1520-5126     ISO Abbreviation:  J. Am. Chem. Soc.     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-03-26     Completed Date:  2008-04-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4475-84     Citation Subset:  IM    
Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
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MeSH Terms
Chromium / chemistry*
Cyanides / chemistry*
Metals, Heavy / chemistry*
Models, Molecular
Organometallic Compounds / chemistry*
Powder Diffraction
Propylamines / chemistry
Reg. No./Substance:
0/Cyanides; 0/Ligands; 0/Metals, Heavy; 0/N,N-di(3-aminopropyl)amine; 0/Organometallic Compounds; 0/Propylamines; 7440-47-3/Chromium

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