Magnetic and Mössbauer studies of FeIII-LnIII coordination clusters constructed from polyethylene glycol ligands

Auteurs

• Peng Guo

Paramètres

• Manuels
• Manuels universitaires

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The discovery of SMMs presents unique opportunities for observing quantum effects and developing novel molecular devices for information storage and quantum computing. However, the low energy barrier for reorienting magnetization in current SMMs limits their practical applications, necessitating further exploration for new SMMs to study magnetic relaxation phenomena. The properties of SMMs are influenced by the total spin ground state (S) and magnetic anisotropy (D). A promising synthetic pathway involves combining high spin ions like FeIII with highly anisotropic ions such as LnIII. Both ions are classified as hard acids and are oxophilic, while polyethylene glycol and carboxylic acid ligands provide oxygen donors. This approach has led to the assembly of fifty-three FeIII-LnIII coordination clusters. Although incorporating LnIII generally enhances SMM properties, their contributions remain complex. Magneto-structural relationships were established through single crystal XRD, magnetic susceptibility, micro-SQUID measurements, and Mössbauer spectroscopy. Certain compounds exhibited slow magnetization relaxation, indicating potential SMM behavior, with compound 3 confirmed as an SMM. Notably, compound 38 showed the highest energy barrier of 78 K for FeIII-LnIII systems. Mössbauer measurements revealed that static magnetic fields can affect the slow relaxation caused by DyIII ions. Additionally, compounds 42 and 44 demonstrated

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• Année de publication: 2013