Electronic structure and spectra of (Cu2O)n–H2O complexes
Literature Information
Jerry Whitten
Density functional theory calculations have been employed to determine optimized geometries for different (Cu2O)n clusters for n = 1 to 6, 12 and 18. The results show the formation of (Cu2O)n rings for n ≥ 2, while (Cu2O)n nanobarrels have been determined for n = 12 and for n = 18. Adsorption of H2O on the (Cu2O)n clusters occurs preferentially by interaction of the water O with outer Cu atoms. Absorption spectra calculated by time dependent density functional theory show that in all cases charge-transfer excitations from occupied orbitals of the (Cu2O)n cluster to a Rydberg orbital of H2O contribute to the character of the singlet excited states calculated at energies starting at about 2.6 eV, with increasing contribution found at higher excitation energies. Configuration interaction calculations on selected (Cu2O)n–H2O complexes determine charge-transfer excitations to contribute significantly to excited states lying at 4.6–6.2 eV above the ground state.
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