Core electrons magnetic properties

Stable Mn(HI) compounds, Mn(R2r fc)3, have been known for a long time (42, 46). The structure of Mn(Et2C tc)3 is elucidated (47). The inner geometry of the Mn(CS2)3 core does not conform to the usual D3 point symmetry of transition metal complexes of this type, but shows a strong distortion attributed to the Jahn-Teller effect. The electronic spectrum (48, 49) and the magnetic properties of this type of complexes are well studied (50). 

In the above sections, our attention was primarily focused on the structural and optical properties of lanthanide doped in nanoparticles such as spherical QDs. Lanthanides doped in some other novel low-dimensional nanostructures including core-shell, one-dimensional (ID) nanowires and nanotubes, two-dimensional (2D) nanofilms, hollow nanospheres, 2D nanosheets and nanodisks have also attracted extensive attention. It is expected that their unique structures could result in unusual mechanical, electronic, optical and magnetic properties. So far few papers have been reported for lanthanide ions other than Eu3+ in these materials. Much attention is focused on the optical properties of Eu3+ ions in view of their very good spectroscopic properties. 

As the series La-Lu is traversed, there is a decrease in both the atomic radii and in the radii of theLn + ions, more markedly at the start of the series. The 4f electrons are inside the 5s and 5p electrons and are core-like in their behaviour, being shielded from the ligands, thus taking no part in bonding, and having spectroscopic and magnetic properties largely independent of environment. The 5s and 5p orbitals penetrate the 4f subshell and are not shielded from... 

Atomic-like f electron states in condensed matter were first studied in rare-earth and actinide metallic or non metallic compounds. There the multiplicity of the f states and related properties like magnetic moment, Curie-Weiss susceptibilities and spectra (where the crystal field splitting is measured) indicate that for most of the rare-earth series (RE) it is a good approximation indeed to consider those f electrons as atomic-like states. Then for the calculation of properties we can treat the f electrons in those compounds within the same approximations as for the core electrons and assume that the interaction between f electrons in different sites is carried through the conduction or the valence electrons. 

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