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Photophysical properties of a series of cycloplatinated(II) complexes featuring allyldiphenylphosphane

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A series of cycloplatinated(II) complexes with a general formula of [Pt(C^N)(Me)(PPh2allyl)], 1–4, where C^N = deprotonated form of 2-phenylpyridine (ppy, 1), 2,2′-bipyridine (bpy, 2), 2,2′-bipyridine N-oxide (O-bpy, 3) and 7,8-benzo[h]quinoline (bzq, 4) ligands, has been synthesized. The new complexes were characterized spectroscopically and the structures of complexes 1 and 4 were confirmed by single crystal X-ray crystallography. With the exception of complex 3 (containing O-bpy), all of the complexes exhibited strong luminescence at 298 K (solid) and 77 K (solution and solid). Upon photoexcitation, these complexes revealed structured emission profiles which had mixed 3ILCT/3MLCT (L = cyclometalated moieties) character in the emissive states. Besides, they represent long luminescence lifetimes in the microsecond domain, displaying the phosphorescent nature of the emission. Complex 1, containing the ppy ligand, exhibits the brightest color and highest quantum yield value compared to the other complexes (2 and 4). Also, this complex is brighter than its other analogues ([Pt(ppy)(Me)(PPh2Me)], A, and [Pt(ppy)(Me)(PPh3)], B) and this arises from some particular intermolecular C(sp2)–H⋯π short contacts imposed by the allyl group. The aforementioned short contacts are not available in the structures of complexes A and B. The interactions perhaps enforce extra structural rigidity and resulted in a high quantum efficiency for complex 1. Finally, all of the photophysical results were supported by density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations.

Graphical abstract: Photophysical properties of a series of cycloplatinated(ii) complexes featuring allyldiphenylphosphane

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Publication details

The article was received on 05 Jan 2017, accepted on 20 Mar 2017 and first published on 21 Mar 2017

Article type: Paper
DOI: 10.1039/C7NJ00055C
Citation: New J. Chem., 2017, Advance Article
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    Photophysical properties of a series of cycloplatinated(II) complexes featuring allyldiphenylphosphane

    H. R. Shahsavari, R. Babadi Aghakhanpour, M. Babaghasabha, M. Golbon Haghighi, S. M. Nabavizadeh and B. Notash, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ00055C

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