Probing the Inverse Trans Influence in Americium and Lanthanide Tribromide Tris(tricyclohexylphosphine oxide)

21 October 2019, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

The synthesis, characterization, and theoretical analysis of meridional americium tribromide tris(tricyclohexylphosphine oxide), mer-AmBr3(OPcy3)3 has been achieved and is compared with its early lanthanide (La to Nd) analogs. The data show that homo trans ligands show significantly shorter bonds than the cis or hetero trans ligands. This is particularly pronounced in the americium compound. DFT along with multiconfigurational CASSCF calculations show that the contraction of the bonds relates qualitatively with overall covalency, i.e. americium shows the most covalent interactions compared to lanthanides. . However, the involvement of the 5p and 6p shells in bonding follows a different order, namely cerium > neodymium ~ americium. This study provides further insight into the mechanisms by which ITI operates in low-valent f-block complexes.

Keywords

actinide 5 f orbitals
lanthanide 4 f orbitals
phosphine oxide ligand
bromide ligand
octahedral

Supplementary materials

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Title
AmBrOPcy ESI ChemArxiv
Description
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