V-E-2 High-Spin Polynitroxide Radicals as Versatile Bridging Ligands for Transition Metal Complexes with High Ferri/Ferromagnetic T_C

Hiizu IWAMURA (Kyushu Univ.), Katsuya INOUE and Takashi HAYAMIZU (Kyushu Univ.)

[Pure Appl. Chem. 68, 243 (1996)]

(pi)-Conjugated di- and trinitroxide radicals with triplet and qualtet groung states, respectively, were react with manganese(II) bis(hexafluoroacetylacetonate) to give polymer complexes having well-defined structures. While a 1:1 1-D complex from m-phenylenebis (nitroxide) was found to be a metamagnet (T_C = 5.5 K), 2:3 2-D and 3-D complexes from the trinitroxides become ferri/ferro-magnets with T_C in the range 3.4 - 46 K. Design of these self-assembled heterospin systems with tailored dimensions and the sign and magnitude of the exchange coupling will serve as a useful strategy for exploring higher T_C molecule based magnets.

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