4f-Orbital Mixing Increases the Magnetic Susceptibility of Cp′3Eu
Abstract
Traditional models of lanthanide electronic structure suggest that bonding is predominantly ionic, and that covalent orbital mixing is not an important factor in determining magnetic properties. Here, 4f orbital mixing and its impact on the magnetic susceptibility of Cp′3Eu (Cp′ = C5H4SiMe3) was analyzed experimentally using magnetometry and X-ray absorption spectroscopy (XAS) methods at the carbon K-edge and at the Eu M5,4-edge and L3-edge. Pre-edge features in the experimental and TDDFT-calculated C K-edge XAS spectra provided unequivocal evidence of C 2p and Eu 4f orbital mixing in the π-antibonding orbital of a′ symmetry. The charge-transfer configurations resulting from 4f orbital mixing were identified spectroscopically by using Eu M5,4-edge and L3-edge XAS. Modeling of variable-temperature magnetic susceptibility data showed excellent agreement with the XAS results and indicated that charge-transfer significantly increased the magnetic susceptibility of Cp′3Eu.
- This article is part of the themed collection: 2024 Chemical Science HOT Article Collection