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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Study on the synthesis, characterization, photophysical performance and oxygen-sensing behavior of a luminescent Cu(I) complex with large conjugation plane
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Study on the synthesis, characterization, photophysical performance and oxygen-sensing behavior of a luminescent Cu(I) complex with large conjugation plane

机译：大共轭平面发光Cu（I）配合物的合成，表征，光物理性能和氧传感行为的研究

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摘要

In this paper, a diamine ligand of dipyrido[3,2-a:2′,3′-c] phenazine (DPPZ) and its corresponding Cu(I) complex with triphenylphosphine (PPh_3) as the phosphorous ligand are synthesized. Full characterization on [Cu(DPPZ)(PPh_3)_2]BF_4, including NMR, elemental analysis and single crystal analysis, confirms its molecular identity. Upon photon excitation, the emission of [Cu(DPPZ)(PPh _3)_2]BF_4 owns a long excited state lifetime of ～6 μs and shows a maximum intensity at 616 nm, under pure N_2 atmosphere. Theoretical calculation on [Cu(DPPZ)(PPh_3) _2]BF_4 single crystal suggests that the excited state has a triplet metal-to-ligand-charge-transfer character. By embedding [Cu(DPPZ)(PPh_3)_2]BF_4 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)(PPh_3)_2]BF_4 excited state. Due to the porous structure of nanofibrous polystyrene matrix, a short response time of ～16 s towards molecular oxygen is also observed with stable quenching signal.
机译：本文合成了二吡啶并[3,2-a：2'，3'-c]吩嗪（DPPZ）的二胺配体及其相应的以三苯基膦（PPh_3）为磷配体的Cu（I）配合物。对[Cu（DPPZ）（PPh_3）_2] BF_4的完整表征，包括NMR，元素分析和单晶分析，证实了其分子身份。在光子激发下，[Cu（DPPZ）（PPh _3）_2] BF_4的发射具有约6μs的长激发态寿命，并且在纯N_2气氛下显示最大强度为616 nm。对[Cu（DPPZ）（PPh_3）_2] BF_4单晶的理论计算表明，激发态具有三重态金属到配体的电荷转移特性。通过将[Cu（DPPZ）（PPh_3）_2] BF_4嵌入聚苯乙烯的聚合物支撑基质中，发现发射信号对变化的氧浓度敏感，最大灵敏度为3.78。我们将此敏感性归因于DPPZ配体中的大共轭平面，它可以增加激发态电子的数量并有利于[Cu（DPPZ）（PPh_3）_2] BF_4激发态的氧攻击。由于纳米纤维聚苯乙烯基体的多孔结构，还观察到了对分子氧的约16 s的短响应时间，并具有稳定的猝灭信号。

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