Mononuclear copper(Ⅰ) complexes with mechanochromic thermally activated delayed fluorescence behaviour based on switchable hydrogen bonds

A series of viologen complexes containing thiophene and Br− dual fluorescent chromophores for continuous visual sensing of pH and Hg2+

“…The complexes all have two absorption peaks at 197 and 247 nm, which represent the conjugated π–π* transition of the aromatic ring and the n–π* transition of the viologen functional group, respectively. 32,33 Single emission peaks at 504, 544 and 532 nm are presented by complexes 1–3 , respectively, when excited at 325 nm (Fig. 2a).…”