Synthesis and photochromism of dithienylethene-based isocyanide and gold (I) complexes with various alkyl chains

摘要

The development of novel dithienylethene-based complexes is highly desirable for potential application in the photoresponsive optoelectronics. In this contribution, we designed and prepared four novel dithienylethenecontaining isocyanides 9a-9d and their binuclear gold (I) complexes 3a-3d with various alkyl chains. They were fully characterized and confirmed by H-1 NMR, C-13 NMR, F-19 NMR, and HRMS (ESI-TOF). Upon alternating irradiation with UV light at 302 nm and visible light at 530 nm, these isocyanides and corresponding gold (I) complexes displayed good photochromic behavior. And the slight effect of the length of alkyl chains on photochromic properties of these isocyanides and gold (I) complexes was observed. Moreover, compared to the precursors 9a-9d, their gold (I) complexes 3a-3d showed higher molar absorption coefficients for ring-open isomers, closing rate and cycloreversion quantum yields. In addition, gold (I) complexes displayed much more excellent fatigue resistance compared with that of isocyanides. Accordingly, these results further proved the formation of gold (I) complexes can promote photochromic behavior to some extent

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