A single-chain magnet (SCM) of [Mn(TBPP)(TCNE)] ·4m-PhCl 2 (1), where TBPP 2- = meso-tetra(4-biphenyl)porphyrinate; TCNE ·- = tetracyanoethenide radical anion; m-PhCl 2 = meta-dichlorobenzene, was prepared via suppression of interchain interactions. 1 has a one-dimensional alternating Mn III(porphrin)-TCNE ·-chain structure similar to those of a family of complexes reported by Miller and co-workers. From a comparison of the static magnetic properties of 1 with other Mn III(porphyrin)-TCNE ·- chains, a magneto-structural correlation between the intrachain magnetic exchange and both the dihedral angle between the mean plane on [Mn(TBPP)(TCNE)] and Mn-N≡C was observed. The ac magnetic susceptibility data of 1 could be fit with the Arrhenius law, indicating that slow magnetic relaxation and ruling out three-dimensional long-range ordering and spin-glass-like behavior. The Cole-Cole plot for 1 was semicircular, verifying that it is an SCM. Therefore, 1 is an ideal single-chain magnet with significantly strong intrachain magnetic exchange interactions beyond the Ising limit.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry