Ultrafast spectroscopy of the uranium(IV) and thorium(IV) bis(ketimide) complexes (C5Me5)2An[-N=C(Ph)(CH2Ph)]2 (An = Th, U).
Ultrafast pump-probe spectroscopic studies have been performed on (C 5Me 5) 2U[- N=C(Ph)(CH 2Ph)] 2 and (C 5Me 5) 2Th[- N=C(Ph)(CH 2Ph)] 2 including, for the uranium complex, the first direct measurement of dynamics of electronic deactivation within a 5f-electron manifold. Evidence has been found for strong coupling between the electronic ground state and the f-electron manifold which dominates the dynamics of the excited states of the bis(ketimide) uranium complex. These also demonstrate strong singlet-f manifold coupling, which assists in the deactivation of the photoexcited state of the uranium complex, and provide information on intersystem crossing and internal conversion processes in both complexes.
Hilton
David J
DJ
MPA-CINT, MS K771, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. dhilton@uab.edu
Prasankumar
Rohit P
RP
Schelter
Eric J
EJ
Thorsmølle
Verner K
VK
Trugman
Stuart A
SA
Shreve
Andrew P
AP
Kiplinger
Jaqueline L
JL
Morris
David E
DE
Taylor
Antoinette J
AJ