Photochromic Benzo[b]phosphole Alkynylgold(I) Complexes with Mechano- chromic Property to Serve as Multistimuli-Responsive Materials

Abstract

A series of novel benzo[b]phosphole alkynylgold(I) complexes has been demonstrated to display photochromic and mechanochromic properties upon applying the respective stimuli of light and mechanical force.1 Promising multistimuli-responsive properties of this series of gold(I) complexes have been successfully achieved through judicious molecular design, which involves incorporation of the photochromic dithienylethenecontaining benzo[b]phosphole into the triphenylamine-containing arylethynyl ligand that is susceptible to mechanical force-induced color changes via gold(I) complexation.1 With excellent thermal irreversibility and robust fatigue resistance of this series of gold(I) complexes, multicolor states controlled by the photochromism and mechanochromism have been realized.1 Repeatable photochromic and mechanochromic cycles without apparent loss of reactivity have also been observed under ambient conditions.1 Reference: 1. Wu, N. M.-W.; Ng, M.; Yam, V. W.-W. Angew. Chem. Int. Ed. 2019, 58, 30273031.