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论文类型：期刊论文

发表时间：2013-11-21

发表刊物：DALTON TRANSACTIONS

收录刊物：SCIE、EI、Scopus

卷号：42

期号：43

页面范围：15326-15331

ISSN号：1477-9226

摘要：The mononuclear Co(II) complex dmphCoBr (dmph = 2,9-dimethyl-1,10-phenanthroline) was obtained and X-ray structurally characterized as a distorted tetrahedron environment that is responsible for the moderately strong positive anisotropy of high spin Co(II). In combination with variable-field magnetic susceptibility data at low temperature, high-field electron paramagnetic resonance (HF-EPR) spectroscopy reveals the presence of easy-plane anisotropy (D > 0) in complex dmphCoBr. Slow magnetic relaxation effects were observed for dmphCoBr in the presence of a dc magnetic field. At very low temperatures, ac magnetic susceptibility data show the magnetic relaxation time, tau, to be temperature-independent, while above 2.4 K thermally activated Arrhenius behavior is dominated with U-eff = 22.8(8) cm(-1) and tau(0) = 3.7(5) x 10(-10) s. Upon dilution of the complex within a matrix of the isomorphous compound dmphZnBr, ac susceptibility data reveal the individual molecular nature of the slow magnetic relaxation and indicate that the quantum tunneling pathway observed at low temperatures is likely mediated by intermolecular dipolar interactions.