A MnIII2FeII chain with a [-Mn III-(OPh)2-MnIII-ON-Fe II-NO-] repeat unit was synthesized via the assembling reaction of MnIII salen-type dimers and FeII pyridyloximate complexes, where the -(OPh)- and -ON- bridges represent a biphenolate bridge and an oximate bridge, respectively. The bulky counter anions, BPh 4-, which surround the chain to form a zeolite-like brick wall, successfully isolate the chains from a magnetic point of view. This compound is isostructural with Mn2Ni-BPh4, which is an SCM with ST = 3 (H. Miyasaka, A. Saitoh, M. Yamashita and R. Clérac, Dalton Trans., 2008, 2422). Because the FeII unit is diamagnetic, the MnIII dimer, which has the potential to be a single-molecule magnet (SMM), is nearly magnetically isolated, although a weak antiferromagnetic interaction with J/kB ≈ -0.1 K is perturbed between the MnIII dimers with ST = 4 via the Fe II unit. Ac susceptibility data shows that two types of relaxation of the magnetization are present, which are attributed to SMM and chain relaxations.
ASJC Scopus subject areas
- Inorganic Chemistry