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The phosphorescent properties of a series of diarylethene-containing platinum complexes: the effect of ligand photoisomerization

Abstract

A theoretical comparison about the photophysical and photochemical properties has be made among a series of diarylethene-containing Pt(II) complexes that have two kinds of isomers exihibiting different optical behavior. It is found that the extension of conjugated systems and electron-withdrawing substitute on host-ligand promote the rigidity of structures, which is beneficial to the electron transfer during excitation. Moreover, the phosphorescence emission and quenching of complexes can be controlled by utilizing the contrary optical performance of their two isomers. In closed-ring forms, the complexes suffer a phosphorescence quenching for the inefficient involvement of Pt in the excitation and the low energy gap between first triplet excited state and ground state. In open-ring forms, the shift of conjugated systems makes the excitation switch from diarylethene to Pt so that spin–orbit coupling effect can be achieved, which leads to an effective phosphorescence emission. In addition, calculation of radiative decay rate kr is proposed to give an evaluation of the radiative decay process of open-ring forms. And the analysis on the potential energy surface of triplet excited state presents an in-depth description about the role of isomerization in their nonradiative decay process. All results above manifest the tunability and applicability of diarylethene in organometallic materials. Based on it, new complexes have been designed as promising candidates with better photoresponsive and phosphorescent performance.

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Publication details

The article was received on 16 Jun 2017, accepted on 27 Jul 2017 and first published on 28 Jul 2017


Article type: Research Article
DOI: 10.1039/C7QO00476A
Citation: Org. Chem. Front., 2017, Accepted Manuscript
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    The phosphorescent properties of a series of diarylethene-containing platinum complexes: the effect of ligand photoisomerization

    Z. Zhang, W. Wei, F. Bai, B. Shamsa and H. Zhang, Org. Chem. Front., 2017, Accepted Manuscript , DOI: 10.1039/C7QO00476A

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