Vapochromism and vapoluminescence of platinum(II) 3,8-bis-(3-hydroxy-3-methylbut-1-yn-1-yl)-phenanthroline organometallic complexes with bis-arylethynyl derivatives.
英文:
Vapochromism and vapoluminescence of platinum(II) 3,8-bis-(3-hydroxy-3-methylbut-1-yn-1-yl)-phenanthroline organometallic complexes with bis-arylethynyl derivatives.
A new series of platinum(II) organometallic complexes with 3,8-bis-(3-hydroxy-3-methylbut-1-yn-1-yl)-1,10-phenanthroline (3,8-Phen≡C(CH3)2OH) and nine resp. arylethynyl ligands with different substituents (Pt(3,8-Phen≡C(CH3)2OH)(≡Ph-R2)2: R2 = H (1OH), 2-F (2OH), 3-F (3OH), 4-F (4OH), 4-Me (5OH), 4-CF3 (6OH), 4-t-Bu (7OH), 3,5-di-CF3 (8OH), 3,5-di-t-Bu (9OH)) were synthesized and their luminescences in soln. and solid state were characterized by photoluminescence spectroscopy. The luminescence of each of the new complexes, 1OH - 9OH, in soln. was assigned to the phosphorescence from the mixed transition of 3MLCT/3LLCT (LLCT = ligand-to-ligand charge transfer), revealing that two series had very similar emission spectra: Pt(3,8-Phen≡TMS)(≡Ph-R)2 1TMS - 9TMS and Pt(3,8-Phen≡H)(≡Ph-R)2 1H - 9H in soln. In solid state, the emission spectra of three series of platinum organometallic complexes, 1OH - 9OH, 1H - 9H, and 1TMS - 9TMS, were obsd. over a wide range (500-1100 nm) because the phosphorescence of each of these complexes was assigned to the emission from the 3MLCT/3LLCT mixed transition and/or the transition of a metal-metal-to-ligand charge transfer, called 3MMLCT. Results of vapochromism and vapoluminescence expts. with 13 species of volatile org. compds. (VOCs) for three series of the 27 above-mentioned platinum complexes suggested that the vapochromism of the present complex systems was induced by sterically hindered substituents of the arylethynyl ligands as tert-Bu substituents, and that the expansion of the space among the mols. in solid state is important for selective and multicolor detection with vapochromism and vapoluminescence for VOCs. Esp., the vapoluminescence expt. with VOCs for 9TMS, which was composed of a combination of the bulkiest ligands, 3,8-bis-(trimethylsilyl)ethynyl-1,10-phenanthroline and 3,5-di-t-butyl-phenylethynyl ligands, among the present 27 complexes showed multicolor changes from yellow to dark brown, in contrast with resp. VOCs. [on SciFinder(R)]
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