Multi-Mode Switchable Luminescence of Tetranuclear Cubic Copper(I) Iodide Complexes with Tertiary Arsine Ligands

Abstract Tetranuclear cubic copper(I) iodide (CuI) complexes were synthesized by utilizing tertiary arsine ligands such as triphenylarsine, tri(p-tolyl)arsine, 9-phenyl-9-arsafluorene, and 1-phenylarsolane; except for triphenylarsine, these ligands were prepared by the practical methods that we previously developed. The obtained complexes exhibited intense emission in the crystalline states even at room temperature. Their emission colors were drastically changed by mechanical stimulus, temperature, and excitation wavelength. These complexes are the first examples of cubic Cu4I4 complexes with arsenic ligands exhibiting stimuli-responsive and excitation wavelength-dependent luminescence.