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- W2927783463 abstract "Syntheses of a novel pseudotetrahedral four-coordinate mononuclear Co(II) complex that has two halved phthalocyanine moieties as the ligands, [Co(half-Pc)2] (1), and its magnetic properties as a single molecule magnet (SMM) are reported. A one pot reaction of phthalonitrile and lithium methoxide followed by the coordination to a Co(II) ion gave 1 as an orange solid in a moderate yield. X-ray crystallography on 1 reveals tetragonally distorted coordination geometry around the Co(II) ion. The M–HT–1 plots suggest that 1 has large axial magnetic anisotropy. The ac magnetic susceptibility data of the magnetically diluted 1 (dil.1) clearly show that the complex acts as an SMM even in the absence of the external static magnetic field (Hdc). The influence of intermolecular and intramolecular interactions for the magnetic relaxation behaviors has been discussed by comparison of the magnetic data of 1 and dil.1. The Orbach process is suggested as the predominant mechanism of magnetic relaxations in the high-temperature range, and the Arrhenius plots provide the effective relaxation energy barrier and pre-exponential factor of Ueff = 54.0 cm–1 and τ0 = 3.17 × 10–10 s, respectively. The direct estimation of the axial anisotropic parameter of 1 was successfully performed by high-field, multifrequency ESR measurements up to 55 T and 2.5 THz. The evaluated axial zero-field splitting (ZFS) energy of 57.0 cm–1 is comparable to the Ueff energy, confirming that the magnetic relaxations are initiated by the thermal excitation from the ground |MS⟩ = |±3/2⟩ states to the |±1/2⟩ states in the high-temperature range. The results of the ab initio calculations based on the CAS(7,5) SCF wave functions indicate that the ground states of 1 consist mainly of |MS⟩ = |±3/2⟩ states, while the first excited states are the mixture of |MS⟩ = |+1/2⟩ and |−1/2⟩." @default.
- W2927783463 created "2019-04-11" @default.
- W2927783463 creator A5001345070 @default.
- W2927783463 creator A5034057772 @default.
- W2927783463 creator A5034328269 @default.
- W2927783463 creator A5038827924 @default.
- W2927783463 creator A5040598452 @default.
- W2927783463 creator A5084922929 @default.
- W2927783463 date "2019-04-01" @default.
- W2927783463 modified "2023-10-03" @default.
- W2927783463 title "Synthesis of a Neutral Mononuclear Four-Coordinate Co(II) Complex Having Two Halved Phthalocyanine Ligands That Shows Slow Magnetic Relaxations under Zero Static Magnetic Field" @default.
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- W2927783463 doi "https://doi.org/10.1021/acs.inorgchem.9b00286" @default.