The electronic absorption spectra in solution of four square-planar nickel(II) complexes show weak and extremely broad bands in the near i.r. region, which are assigned to singlet–triplet transitions; this is consistent with an energy-transfer mechanism for efficient quenching of singlet oxygen by these complexes.
D. F. Evans, J. Chem. Soc., Chem. Commun., 1980, 1134 DOI: 10.1039/C39800001134
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