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Interpenetrated Three‐Dimensional Mn II M III Ferrimagnets, [Mn(4dmap) 4 ] 3 [M(CN) 6 ] 2 ⋅10 H 2 O (M=Cr, Mn): Structures, Magnetic Properties, and Pressure‐Responsive Magnetic Modulation
Author(s) -
Kaneko Wakako,
Mito Masaki,
Kitagawa Susumu,
Ohba Masaaki
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200701364
Subject(s) - ferrimagnetism , crystallography , chemistry , cyanide , antimonide , manganese , space group , denticity , molecule , x ray crystallography , crystal structure , diffraction , inorganic chemistry , magnetization , physics , organic chemistry , quantum mechanics , magnetic field , optics
Two novel cyanide‐bridged ferrimagnets, [Mn(4dmap) 4 ] 3 [M(CN) 6 ] 2 ‐ ⋅10 H 2 O (4dmap=4‐dimethylaminopyridine, M=Cr ( 1 ) and Mn ( 2 )), have been prepared from the reaction of MnCl 2 ⋅4 H 2 O, a monodentate coligand (4dmap), with K 3 [M(CN) 6 ]. X‐ray crystallographic results show that these are isomorphous, and form a unique twofold interpenetrated three‐dimensional framework with a triconnected 6.10 2 net. The framework contains two types of one‐dimensional channel: hexagonal channels based on a cyanide‐bridged Mn 6 M 6 hexagon, and triangle channels segmented by CN‐Mn‐NC linkages, which are filled with lattice water molecules. The dimethylamino groups of the 4dmap coligands are located around a pore and form the basic inner space. Variable‐temperature X‐ray powder diffraction and thermogravimetric analysis results show that the frameworks of both compounds are susceptible to dehydration through the loss of strongly hydrogen‐bonded lattice water molecules. Magnetic measurements on both compounds show a ferrimagnetic ordering occurs at low temperature, T C =17 K for 1 and 6 K for 2 . Application of hydrostatic pressure showed a positive effect on the magnetic ordering. Both values of T C increased linearly, to 25 K for 1 and 15 K for 2 at 1.0 GPa. The magnetic properties of both compounds were reversibly modulated by the external stress.