Abstract
Abstract Absorption spectra, emission spectra, emission lifetime and electrochemical behavior of the complexes c-Pt(Hdpbhq)2, t-Pt(dpbhq)S(Et)2, t-Pt(dpbhq)py, and t-Pt(dpbhq)pyr (where dpbhq2− is the C− deprotonated form of 5,6-dihydro-2,4-diphenylbenzo(h)quinoline (H2dpbhq) and py and pyr are pyridine and pyrazine) have been studied. The structured luminescence spectra observed at 77 K have been assigned to transitions having: (i) metal-to-ligand charge transfer (MLCT) character in the case of Pt(H-dpbhq)2 and mainly MLCT character with some ligand-centered (LC) contribution for the three terdentate trans Pt(II) complexes. The luminescence emission in all cases involves the dpbhq ligand even though the electrochemical results suggest a lowest unoccupied molecular orbital (LUMO) centered on the pyrazine ligand in the Pt(dpbhq)pyr complex.
Published Version
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