Univ Rennes, CNRS, ISCR - UMR6226 , F-35000 Rennes , France.
Dipartimento di Chimica , Università degli Studi di Milano and UdR INSTM di Milano , via Golgi 19 , Milano 20133 , Italy.
Inorg Chem. 2018 Jun 18;57(12):7051-7063. doi: 10.1021/acs.inorgchem.8b00733. Epub 2018 Jun 5.
We disclose a new family of photochromic cyclometalated platinum(II) complexes (PtDTE1 and PtDTE2), where a dithienylethene (DTE) unit is connected at the para-position of the central phenyl ring of (N^C^N) cyclometalated ligand, through two different linkages. Their syntheses are presented along with the X-ray characterizations of both the open and closed isomers of PtDTE1. The investigation of their photophysical properties is made, including absorption, photochromism, emission, and second-order nonlinear properties. We report a quantitative photoisomerization for both PtDTE1 and PtDTE2, irrespective of the nature of the connecting mode between the DTE unit and the platinum(II) moiety. The efficient photochromism allows a significant NLO photomodulation, both in solution and in thin films. In addition, we show that the photoluminescence of the PtDTE1 and PtDTE2 can be controlled by the open/closed isomerization of the DTE unit.
我们披露了一类新型光致变色的环金属化铂（II）配合物（PtDTE1 和 PtDTE2），其中二噻吩乙烯（DTE）单元通过两个不同的连接键连接在（N^C^N）环金属化配体的中心苯基环的对位上。我们介绍了它们的合成方法，并对 PtDTE1 的开环和闭环异构体进行了 X 射线结构表征。我们研究了它们的光物理性质，包括吸收、光致变色、发射和二阶非线性性质。我们报告了 PtDTE1 和 PtDTE2 的定量光异构化，无论 DTE 单元和铂（II）部分之间的连接模式如何。有效的光致变色允许在溶液和薄膜中进行显著的 NLO 光调制。此外，我们还表明，PtDTE1 和 PtDTE2 的光致发光可以通过 DTE 单元的开/闭环异构化来控制。
