Journal of Organometallic Chemistry
Journal of Organometallic Chemistry
5 years ago

Synthesis and photophysical characterization of phosphorescent platinum(II) bis-(trimethylsilyl)ethynyl-phenanthroline organometallic complexes with bis-arylethynyl derivatives

Synthesis and photophysical characterization of phosphorescent platinum(II) bis-(trimethylsilyl)ethynyl-phenanthroline organometallic complexes with bis-arylethynyl derivatives
Phosphorescent platinum(II) phenanthroline organometallics, Pt(3,8-Phen≡TMS)(≡Ph-R)2, of respective arylethynyl ligands with different substituents (R = H (1), 4-Me (2), 4-t-Bu (3), 4-F (4), 3-F (5), 2-F (6), 3,5-di-t-Bu (7), 4-CF3 (8), 3,5-di-CF3 (9), 4-COOMe (10), 4-NO2 (11)) were synthesized by transmetalation with copper(I) ion. The visible luminescence of these organometallics in deoxygenated CH2Cl2 was assigned to the phosphorescence, and the DFT calculations of 11 organometallics clearly supported the assignment of phosphorescence from the mixed transition of 3MLCT/3LLCT (LLCT = ligand-to-ligand charge transfer). A good linear correlation between the observed emission energy values of phosphorescence and the calculation values of the difference between the lowest excited triplet state and the ground singlet state by DFT or TD-DFT was obtained, and this correlation reflected that the related MOs of these complexes are included in both MLCT and LLCT under the photo-excited triplet state.

Publisher URL: www.sciencedirect.com/science

DOI: S0022328X1730520X

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