Abstract
Electrochemical and optical properties of cyclometallated Rh(III) and Pd(II) complexes based on phenyl-substituted pyrazole, pyridine, and pyrimidine with ethylenediamine, 2,2′-bipyridine, and 1,10-phenanthroline chelating ligands were investigated. One-electron reduction waves of the complexes were assigned to ligand-centered processes of electron transfer on π* orbitals of heterocyclic chelating and cyclometallated ligands, whereas irreversible oxidation waves, to the processes involving a mixed phenyl-metal π/d orbital. The long-wave absorption band results from by the spin-allowed optical transition between π/d-HOMO and a π* orbital of a cyclometallated ligand. The character of the optical transition responsible for low-temperature (77 K) phosphorescence of the complexes is defined by the ratio of the energy gap between π* orbitals of chelating and cyclometallated ligands and by the energy of the singlet-triplet splitting of electron-excited states.
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Original Russian Text © K.P. Balashev, M.V. Puzyk, E.V. Ivanova, 2011, published in Zhurnal Obshchei Khimii, 2011, Vol. 81, No. 7, pp. 1199–1207.
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Balashev, K.P., Puzyk, M.V. & Ivanova, E.V. Optical and electrochemical properties of cyclometallated Rh(III) and Pd(II) complexes based on phenyl-substituted pyrazole, pyridine, and pyrimidine with ethylenediamine, 2,2′-bipyridine, and 1,10-phenanthroline. Russ J Gen Chem 81, 1547–1554 (2011). https://doi.org/10.1134/S1070363211070231
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DOI: https://doi.org/10.1134/S1070363211070231