Add time:09/24/2019 Source:sciencedirect.com
Reaction of 2-(2-pyridyl)imidazo[4,5-f][1,10]-phenanthroline (pipH), [Cu(MeCN)4]ClO4 and diphosphine ligand bis[(2-diphenylphosphino)phenyl] ether (POP) or 9,9-dimethyl-4,5-bis(diphenylphosphino)-9H-xanthene (xantphos) in a 1:2:2 ratio generated four binuclear copper(I) complexes, [Cu2(pipH)(PP)2](ClO4)2 (PP = POP, 1a; xantphos, 2a) and [Cu2(pip)(PP)2]ClO4 (PP = POP, 1b; xantphos, 2b) in neutral and strong alkaline media, respectively. Complexes 1b and 2b containing deprotonated pipH show obvious blue shift and stronger emission compared to complexes 1a and 2a with neutral pipH due to the stronger binding ability, the higher rigidity and conjugate degree resulting from anionic pip ligand and less vibrational quenching due to the loss of NH bond.
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