Abstract
In this paper, a diamine ligand of dipyrido[3,2-a:2′,3′-c]phenazine (DPPZ) and its corresponding Cu(I) complex with triphenylphosphine (PPh3) as the phosphorous ligand are synthesized. Full characterization on [Cu(DPPZ)(PPh3)2]BF4, including NMR, elemental analysis and single crystal analysis, confirms its molecular identity. Upon photon excitation, the emission of [Cu(DPPZ)(PPh3)2]BF4 owns a long excited state lifetime of ∼6μs and shows a maximum intensity at 616nm, under pure N2 atmosphere. Theoretical calculation on [Cu(DPPZ)(PPh3)2]BF4 single crystal suggests that the excited state has a triplet metal-to-ligand-charge-transfer character. By embedding [Cu(DPPZ)(PPh3)2]BF4 into a polymer supporting matrix of polystyrene, the emission signal is found to be sensitive towards varying oxygen concentrations, with a maximum sensitivity of 3.78. We attribute this sensitivity to the large conjugation plane in DPPZ ligand which can increase the population of excited state electrons and favor the oxygen attack on [Cu(DPPZ)(PPh3)2]BF4 excited state. Due to the porous structure of nanofibrous polystyrene matrix, a short response time of ∼16s towards molecular oxygen is also observed with stable quenching signal.
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