Abstract
The [Cu2Br2(DIB)2(PPh2)2]n complex, obtained by the reaction between [Cu4Br4(PPh3)4] and 1,4-diisocyanobenzene (DIB), was found to have a bridged polymeric structure with a planar {Cu2Br2} core. The compound exhibited bluish-green (λmax = 498 nm) and green (λmax = 515 nm) luminescence at 295 and 77 K, respectively, corresponding to the emissions from XLCT (HE band) and (X + M)LCT (LE band), respectively. The dual emission, which is attributed to the luminescence from both bands, was observed at around 178 K. The complex also displayed a change in luminescence color from bluish-green to yellow (λmax = 529 nm) upon applying external mechanical stimuli. The film containing [Cu2Br2(DIB)2(PPh2)2]n was prepared by a cast method using polymethyl methacrylate as a binding agent. The rubbed part of the film turned yellow and the other parts maintained bluish-green luminescence. Restoration of the initial color was feasible by annealing, even in film state.
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