Title of Paper:Controlling assembly and single-molecule magnet behavior of Fe-Ni clusters utilizing steric effect

Hits:

Date of Publication:2018-07-01

Journal:INORGANIC CHEMISTRY COMMUNICATIONS

Included Journals:SCIE

Volume:93

Page Number:87-91

ISSN No.:1387-7003

Key Words:Cyanide bridge; Tunable assembly; Ferromagnetic interactions; Single-molecule magnets; Steric effect

Abstract:Utilizing the building block [(Tp(R))Fe-III(CN)(3)](-) featuring different steric hindrance, a trinuclear [Ni-II (4-Clbpy)(2)] [(pzTp)Fe-III(CN)(3)](2)center dot 4H(2)O (1) (pzTp = tetrakis(pyrazolyl)borate; 4-Clbpy = 4-chlorine-2,2'-dibipyridine) and a tetranuclear {[Ni-II(4-ClbPy)(2)] [(TP*)Fe-III in (CN)(3)]}2 center dot 4CH(3)OH center dot 2H(2)O (2) (Tp* = hydrotris(3,5-dimethylpyrazolyl)borate) were successfully synthesized. Magnetic studies revealed that both compound 1 and 2 exhibited intramolecular ferromagnetic interaction. Dynamic susceptibility study indicated that compound 2 exhibited slow magnetic relaxation. The relaxation energy barrier was Delta/k(B) = 62.31 K with the pre-exponential factor of tau(0) = 2.87 x 10(-10) s. In addition, compound 2 can exhibit hysteresis at 1.8 K.