Covalency in Actinide 5f Compounds: The ESCA Spectra of Diphthalocyaninato-Uranium (IV) and -Thorium(IV).
TEXAS A AND M UNIV COLLEGE STATION DEPT OF CHEMISTRY
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The nature of the bonding in both UPc2 and ThPc2 Pc phthalocyaninato ion has been studied by x-ray photoelectron spectroscopy. While the ESCA spectrum of each of the U4f levels reveals two electron shake-up satellites characteristic of 5f-orbital participation in bonding, i.e. covalency, the corresponding Th4f levels do not. The two shake-up satellite photopeaks observed in the U4f spectra probably arise from electron charge-transfer from molecular orbitals of both metal and ligand character to the corresponding antibonding molecular orbitals. Author
- Atomic and Molecular Physics and Spectroscopy