Papers by Stéphane Bellemin-laponnaz
A novel class of Pd(II) and Pt(II) complexes bearing tridentate bis-aryloxyde triazole ligands wa... more A novel class of Pd(II) and Pt(II) complexes bearing tridentate bis-aryloxyde triazole ligands was prepared by using straightforward and high yielding synthetic routes. The complexes were fully characterized and for four derivatives, their molecular structure were unambigously determined by single-crystal X-ray diffractometric analyses. For the most promising luminescent Pt(II) derivatives, further experimental investigations were carried out to characterize their photophysical features and to ascertain the nature of the emitting excited state by means of electronic absorption, steady-state and time-resolved emission techniques in different conditions. In degassed fluid solution the complexes displayed broad and featureless photoluminescence with λem = 522–585 nm, excited state lifetime up to few microseconds and quantum yield (PLQY) up to 17%, depending on the nature of both ancillary and subsitutent onto the tridentate ligand. Computational investigation at density functional theory and time-dependent DFT were performed to gain insights onto the electronic processes responsible of optical transitions and structure–photoluminescence relationship. Jointly, experimental and theoretical characterization allowed to ascribe the radiative transition as arising from an excited state with admixed triplet-manifold metal-to-ligand charge transfer and ligand-centered (3 MLCT/ 3 LC) character and to elucidate the modulation of the photophysical properties upon variation of substituents for such new family of complexes.
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Papers by Stéphane Bellemin-laponnaz