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

摘要

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 (λ_(em,max)) at 448 and 710 nm, respectively. Upon grinding, the λ_(em,max) of 3α_(ground) and 3β_(ground) are bath-ochromically shifted to 900 nm, i.e., Δλ_(em,max) (3α) = 452 nm or 1.39 eV. Polymorphs 3α and 3β thus represent the first examples of mechanochromic luminescent materials with λ_(em,max) in the IR region.