Luminescent Mechanochromic 9‑Anthryl Gold(I) Isocyanide Complex with an Emission Maximum at 900 nm after Mechanical Stimulation

Upon mechanical stimulation, 9-anthryl gold­(I) isocyanide complex 3 exhibited a bathochromic shift of its emission color from the visible to the infrared (IR) region, which is unprecedented in its magnitude. Prior to exposure to the mechanical stimulus, the polymorphs 3α and 3β exhibit emission wavelength maxima (λem,max) at 448 and 710 nm, respectively. Upon grinding, the λem,max of 3αground and 3βground are bathochromically shifted to 900 nm, i.e., Δλem,max (3α) = 452 nm or 1.39 eV. Polymorphs 3α and 3β thus represent the first examples of mechanochromic luminescent materials with λem,max in the IR region.

受到机械刺激时，9-蒽基异氰金(I)配合物3（9-anthryl gold(I) isocyanide complex 3）的发射颜色发生红移，从可见光区跃迁至红外(IR)区，其红移幅度前所未有。在未施加机械刺激前，多晶型物3α与3β的发射波长最大值（λem,max）分别为448 nm和710 nm。经研磨处理后，3α研磨样品和3β研磨样品的λem,max均红移至900 nm，即Δλem,max(3α)=452 nm，对应能量变化为1.39 eV。由此，多晶型物3α和3β成为首批发射波长最大值位于红外区的力致变色发光材料（mechanochromic luminescent materials）。