Reversible stimuli-responsive luminescence of bimetallic cuprous complexes based on NH-deprotonated 3-(2′-pyridyl)pyrazole

Color regulation of solid-state luminescence is desirable and challenging. Herein, we report two new three- and four-coordinate bimetallic cuprous complexes 1 and 2 , which bear a NH-deprotonated 3-(2′-pyridyl)pyrazole adopting the monoanionic tridentate μ-η 1 (N)η 2 (N,N) bonding mode and exhibit reversible stimuli-responsive luminescence. It is revealed that the reversible stimuli-responsive luminescence for 1 and 2 is triggered by the destruction and restoration of orderly molecular stacking, along with the loss and recovery of the CH 2 Cl 2 solvent molecules for 1 . Virtually, this reversible stimuli-responsive luminescence originates from the breaking and rebuilding of various CH O hydrogen bonds around ClO 4 − , as supported by X-ray single-crystal analysis, the 1 H NMR spectra, and the PXRD and FT-IR spectra in various forms. In addition, the possible applications of this reversible stimuli-responsive luminescence have also been investigated. Reversible stimuli-responsive luminescence virtually stems from the breaking and rebuilding of various CH O hydrogen bonds around ClO 4 − , as supported by single-crystal analysis, the 1 H NMR spectra, and the PXRD and FT-IR spectra in various forms.