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The interplay of d and f orbitals in the chemistry of the early actinides: High spin versus low spin.
- Source :
-
Inorganica Chimica Acta . Aug2023, Vol. 553, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Interplay between d- and f-block coordination schemes is depicted for the borderline element, thorium. [Display omitted] • Early actinides role of d- and f-block orbitals. • Different coordination schemes for the borderline element, thorium. • Quantification of d- and f-block orbital contribution. • Rationalization of low and high spin electronic states based on ligand field. Early actinides lie at the borderline between d- and f-block elements. Here we describe the coordination capabilities of thorium featuring characteristics from both blocks. Thus analysis of the recently synthesized monoanion [Cp 3 Th]− indicates a diamagnetic singlet d2f0 ground state for the central thorium(II) atom. In this species the trigonal (Cp 3)3− ligand system provides a strong ligand field for the thorium d-orbitals accounting for the low spin of this system. This differs from the high spin unambiguous f-element analogue, [Cp 3 U]−. For the d0f0 thorium(IV) complex (η8-C 8 H 8) 2 Th both π→d and π→f forward bonding is observed, where a comparison with (η8-C 8 H 8) 2 U is given. This indicates that a borderline element such as thorium can exhibit either d- or f-block character according to the surrounding ligand field. [ABSTRACT FROM AUTHOR]
- Subjects :
- *THORIUM
*LIGAND field theory
*ACTINIDE elements
*COORDINATE covalent bond
Subjects
Details
- Language :
- English
- ISSN :
- 00201693
- Volume :
- 553
- Database :
- Academic Search Index
- Journal :
- Inorganica Chimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 163549043
- Full Text :
- https://doi.org/10.1016/j.ica.2023.121527