Co-Ligand Involvement in Ground and Excited States of Electron-Rich (Polypyridyl)Pt" Complexes

0181640 - UFCH-W 20030061 RIV DE eng J - Journal Article
Klein, A. - Slageren van, J. - Záliš, Stanislav
Co-Ligand Involvement in Ground and Excited States of Electron-Rich (Polypyridyl)Pt" Complexes.
European Journal of Inorganic Chemistry. - (2003), s. 1917-1928. ISSN 1434-1948. E-ISSN 1099-0682
R&D Projects: GA MŠMT OC D14.20; GA MŠMT OC D15.10
Institutional research plan: CEZ:AV0Z4040901
Keywords : Emission * Platinum * N ligands
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.482, year: 2003

The electronic absorption and luminescence properties of electron-rich organometallic platinum(II) complexes with aromatic .alpha.-diimine ligands [(.alpha.-diimine)PtR2] (R = alkyl, alkynyl, Ph or Mes, Mes = 2,4,6-trimethylphenyl) were examined. The crystal and molecular structures of [(bpy)PtMe2], [(tap)PtPh2] and [(tmphen)PtMes2] were determined from single-crystal XRD and discussed in view of intermolecular interactions that influence the emission behaviour. The combination of theoretical calculations (DFT) and spectroscopic techniques (absorption and emission) revealed the character of electronic transitions and excited states. In particular they showed that the co-ligand involvement in the frontier orbitals is small for R = Me, but large in case of R = alkynyl, Ph or Mes. Depending on the chelate ligand and its substitution pattern, the emission efficiencies of the complexes cover a wide range from strong emission in fluid solution at ambient temperature.
Permanent Link: http://hdl.handle.net/11104/0078175