A Series of Luminescent [(Xantphos)CuILN] Complexes and Their Luminescence Sensing Properties for VOCs Detection and TD-DFT Calculation

被引:0
作者
Jia, Yi-Fan [1 ,3 ]
Song, Li [2 ]
Chen, Jun-Er [1 ]
Jin, Hong-Xiao [1 ]
Jin, Ding-Feng [1 ]
Chen, Yu [1 ]
Shen, Hang-Yan [1 ]
Chai, Wen-Xiang [1 ,3 ]
机构
[1] China Jiliang Univ, Coll Mat & Chem, Hangzhou, Peoples R China
[2] Zhejiang Sci Tech Univ, Sch Chem & Chem Engn, Hangzhou, Peoples R China
[3] Huaqiao Univ, Engn Res Ctr Environm Friendly Funct Mat, Minist Educ, Xiamen, Peoples R China
关键词
CuI complex; solid-state luminescence; stimuli-response; TD-DFT calculation; VOCs sensing; CU(I) COMPLEXES; DIPHOSPHINE LIGANDS; HALIDE; ELECTROLUMINESCENCE; PHOTOLUMINESCENCE; EMISSION; SPECTRUM; CLUSTER;
D O I
10.1002/aoc.70161
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The design and research of luminescent and volatile organic compounds (VOCs) fluorescent sensing/stimuli-response materials are of great significance and challenge. We report herein a series of new [(Xantphos)CuILN] type complexes with tetrahedral CuIP2N coordination, showing luminescence from blue to red and luminescence sensing for VOCs detection (Xantphos is 4,5-bis (diphenylphosphino)-9,9-dimethylxanthene, L-N is N-containing ligand). Firstly, six new complexes 1-6 were designed and ball-milling synthesized by the ligand-addition reaction of a raw material [(Xantphos)CuI] with different N-containing ligands 2-aminopyridine (1), 3-cyanopyridine (2), 4-cyanopyridine (3), 2-(3 '-pyridyl)-benzoxazole (4), 3-I-4-aminopyridine (5), and imidazole (6). Time-dependent density functional theory (TD-DFT) calculations assign the low-energy band (absorption edge) of 1-6 in UV-Vis absorption as a mixed (XL + ML)CT transition, the corresponding (XL + ML)CT excited state is also thought to be the source of photoluminescence (PL). Material 4 has the highest PL efficiency (similar to 44%), which may benefit from its greatest structural rigidity. Material 5 exhibiting the worst PL efficiency should be related to the iodine atom in the L-N ligand (I dominate the highest unoccupied orbitals of the S-1 and T-1 states). Based on its very weak PL, the corresponding thin-film sensor (5) achieve significantly enhanced luminescence sensing (lighting-up mode) for pyridine and 4-methylpyridine vapor. The sensor also achieves the lowest detection limit (LOD = 2.51 ppm) and the fastest response speed (T-50 = 30 s) for pyridine. In addition, the series of materials also show interesting quenching and vapochromic luminescence sensing/stimuli-response for a variety of VOCs vapors.
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页数:17
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