Synthesis, structure and dual-stimulus-responsive luminescence switching of a new platinum(II) complex based on 3-trimethylsilylethynyl-1,10-phenanthroline

Publication date: Available online 4 July 2019Source: Journal of Organometallic ChemistryAuthor(s): Jiajia Kang, Jun Ni, Yanqin Li, Jianjun ZhangAbstractA new diimine-platinum(II) complex, Pt(PhenC≡CSiMe3)(C≡C-C6H4-3-F)2 (1) based on 3-trimethylsilylethynyl-1,10-phenanthroline (PhenC≡CSiMe3), were synthesized and characterized. Two solvated crystals, 1·1/2(ClCH2CH2Cl) and 1·CHCl3 exhibited dual-stimulus-responsive color and luminescence switching behaviors triggered by heating or mechanical grinding. Upon heating, the color and luminescence of both complexes were changed to red with luminescence red-shifting to 656 for 1·1/2(ClCH2CH2Cl) and 691 nm for 1·CHCl3, corresponding to the thermo-triggered luminescence red-shifts of 112–142 nm and 156–189 nm, respectively. The different heated samples confirm that the original stacking structure can accurately affect the luminescence switching properties of luminescent switching materials. Under the mechanical grinding, both complexes were converted to the same red amorphous product with red emission peaked at 702 nm. Interestingly, once exposure to ClCH2CH2Cl or CHCl3 vapor, the heated and ground samples could be thoroughly reverted to crystalline 1·1/2(ClCH2CH2Cl) and 1·CHCl3. Such reversible thermo- and mechanical-grinding-triggered luminescence switching properties of the complexes are attributed to the interconversions of the lowest energy excited states between metal-to-ligand charge transfer (MLCT) and m...

Source: Journal of Organometallic Chemistry - July 5, 2019 Category: Chemistry Source Type: research