cis- and trans-Ligand Effects on the Inverse trans-Influence in [UVI(O)(L)Cl4]0/- (L = Unidentate Ligand) Complexes

Athanassios C Tsipis

doi:10.1021/acs.inorgchem.0c00778

cis- and trans-Ligand Effects on the Inverse trans-Influence in [U^VI(O)(L)Cl₄]^0/- (L = Unidentate Ligand) Complexes

Inorg Chem. 2020 Jul 6;59(13):8946-8959. doi: 10.1021/acs.inorgchem.0c00778. Epub 2020 Jun 17.

Author

Athanassios C Tsipis¹

Affiliation

¹ Laboratory of Inorganic Chemistry, Department of Chemistry, University of Ioannina, Ioannina 45110, Greece.

PMID: 32623891
DOI: 10.1021/acs.inorgchem.0c00778

Abstract

A comprehensive exploration of the inverse trans-influence (ITI) phenomenon in a series of cis-[U^VI(O)(L)Cl₄]^0/- and trans-[U^VI(O)(L)Cl₄]^0/- complexes involving a wide variety of neutral and anionic unidentate ligands L, using relativistic density functional theory, threw light on the still-intriguing physics of ITI, elucidated its origin, and deployed the ligands L in cis- and trans-ITI sequences (ladders). ITI is produced for the complete set of L in both series of [U(O)(L)Cl₄]^0/- complexes, but this is not reflected in the thermodynamic stability of the [U(O)(L)Cl₄]^0/- isomers. In effect the hard and strong σ-donor anionic ligands stabilize the trans isomers, but the opposite is true for the soft σ-donor/π-donor neutral and anionic ligands that stabilize the cis isomers. According to the ITI%(U-L) metrics the hard strong σ-donor anionic ligands exert stronger ITI than the soft σ-donor/π-donor neutral ones, while according to the ITI%(U-O) metrics ITI is produced only for the more stable trans-[U(O)(L)Cl₄]^0/- isomers involving the anionic ligands. In contrast the neutral ligands in the more stable cis-[U(O)(L)Cl₄]^0/- isomers produce the normal cis influence (CI). Furthermore, the more electronegative ligands produce stronger ITI. ITI%(U-O) cis- and trans-philicity ladders are also built for both series of complexes employing the isotropic σ^iso(SO) ¹⁷O NMR shielding constants as a sensitive metric of the ITI phenomenon. The NMR ITI%(U-O) metrics are consistent with the ITI%(U-O) ones illustrating that the isotropic ¹⁷O NMR shifts are sensitive metrics of the covalency of the multiple U-O bonding mode and, hence, of the ITI phenomenon. Interestingly the 2σ BD(U-O) natural bond orbitals play a key role in tuning the bond length and covalency of the U-O bond through the 2σ(U≡O) → 2σ*(U≡O) hyperconjugative interactions. The assessment of the magnitude of the ITI in the [U^VI(O)(L)Cl₄]^0/- complexes and the recognition of the factors affecting ITI dispose a guide to experimentalists working in the area of uranium chemistry to develop strategies for stabilizing uranium-ligand linkages.