Low temperature absorption spectra and ground state electronic structure of tetrakis(2,6-di-tert-butylphenoxide)uranium(IV)

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We present low temperature visible and near-IR intra-5f 2 electronic absorption spectra of U( O-2,6- t-Bu 2C 6H 3) 4, a compound of near-T d point group symmetry about the uranium. The ground state is tentatively assigned as having E symmetry in T d, because the number of symmetry-allowed transitions is close to the number which we observed. Transitions out of an excited state 90 cm −1 above the ground state were also observed. This state is assigned to A 1 symmetry, again based on counting transitions. These assignments are consistent with magnetic susceptibility measurements.