Center for Functional Materials of Pingxiang

Pingxiang, China

Center for Functional Materials of Pingxiang

Pingxiang, China
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Xu X.-Y.,Hunan University | Xu X.-Y.,Center for Functional Materials of Pingxiang | Xiao H.-N.,Hunan University | Deng A.-P.,Center for Functional Materials of Pingxiang
Optical Materials | Year: 2014

A series of [Cu(N-N)(PPh3)2]BF4 complexes were synthesized and characterized in this paper, where N-N and PPh3 suggest a diamine ligand and triphenylphosphane, respectively. Their structures were revealed by single crystal analysis and density functional theory calculation. The photophysical feature comparison between those Cu(I) complexes revealed the correlation between emission performance and diamine ligand structure. In addition, it was found that the emissive states were vulnerable to O2 attack, making them potential oxygen sensing probes. They were thus doped into a silica molecular sieve SBA-15 to systematically explore their oxygen sensing performance. High sensitivity and good photostability were observed from the composite sensing systems. © 2014 Elsevier B.V. All rights reserved.


Xu X.-Y.,Hunan University | Xu X.-Y.,Center for Functional Materials of Pingxiang | Xiao H.-N.,Hunan University | Xu Y.-M.,Center for Functional Materials of Pingxiang | Zhang M.-J.,Center for Functional Materials of Pingxiang
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2012

In this paper, we synthesize a new ligand of 1-ethyl-2-(naphthalen-1-yl)- 1H-imidazo[4,5-f][1,10]phenanthroline (Phen-Np-Et) and its corresponding Cu(I) complex of [Cu(Phen-Np-Et)(POP)]BF 4, where POP is bis(2-(diphenylphosphanyl)phenyl) ether. The single-crystal structure, electronic nature and photophysical property of [Cu(Phen-Np-Et)(POP)]BF 4 are discussed in detail. It is found that the yellow emission from [Cu(Phen-Np-Et)(POP)]BF 4 owns a long excited state lifetime of 287 μs under pure N 2 atmosphere. Theoretical calculation on [Cu(Phen-Np-Et)(POP)] + suggests that the emission comes from a triplet metal-to-ligand-charge-transfer excited state. Then, [Cu(Phen-Np-Et)(POP)]BF 4 are doped into two matrixes of polystyrene and MCM-41 to investigate the oxygen-sensing performance. Finally, sensitivity maxima of 9.6 and 3.6 are achieved by the composite nanofibers of [Cu(Phen-Np-Et)(POP)]BF 4/polystyrene and the [Cu(Phen-Np-Et)(POP)] BF 4/MCM-41, respectively. Both samples are highly sensitive toward molecular oxygen, owing to the large surface-area-to-volume ratios of nanofibrous membranes and MCM-41 matrix. © 2012 Elsevier B.V. All rights reserved.


Xu X.-Y.,Center for Functional Materials of Pingxiang | Xu X.-Y.,Hunan University | Deng A.-P.,Center for Functional Materials of Pingxiang | Xiang Y.,Center for Functional Materials of Pingxiang
Journal of Luminescence | Year: 2015

In this paper, we reported a Re(I) complex Re(CO)3(IPD-Et)Br having an enlarged conjugation chain for oxygen sensing purpose, where IPD-Et=4-(1-ethyl-1 H-imidazo [4,5-f][1,10] phenanthrolin-2-yl)-N,N-diphenylaniline. Its conjugation chain was composed of triphenylamine group and imidazole group. In addition, an alkyl chain was connected with this N-N ligand to breach π-π attraction between ligand planes. It was assumed that above two factors could improve oxygen sensing sensitivity. Theoretical calculation and analysis firstly confirmed this hypothesis. Then photophysical measurement on Re(CO)3(IPD-Et)Br suggested that its emission was a lon-lived one peaking at 545 nm and thus vulnerable to molecular O2. Composite systems were constructed for oxygen sensing, using Re(CO)3(IPD-Et)Br as probe and mesoporous silicate MCM-41 as supporting matrix, respectively. Linear Stern-Volmer curves, short response time of ~13 s and high sensitivity of 3.99 were finally obtained. © 2014 Elsevier B.V.


Xu X.-Y.,Center for Functional Materials of Pingxiang | Xu X.-Y.,Hunan University | Xiao H.-N.,Hunan University
Journal of Luminescence | Year: 2012

In this paper, we synthesize a novel diamine ligand of 4,7-dinonadecyl-1, 10-phenanthroline (DN-Phen) with two long alkyl chain arms serving as a shield and its corresponding dinuclear Re(I) complex of Re 2(CO) 6(bpy)(DN-Phen) 2 (bpy=4,4′-bipyridine), aiming at an optical sensor immune to the surrounding interferences. Its geometric and electronic structures are investigated, which suggest that the introduced long alkyl chains act as a shield for the excited state of emissive center. The promising photophysical parameters of Re 2(CO) 6(bpy)(DN- Phen) 2, including the immunity of emission towards the surrounding interferences and long excited state lifetime, make itself a potential probe for oxygen detection. By doping Re 2(CO) 6(bpy)(DN-Phen) 2 into two silica matrixes of MCM-41 and SBA-15, oxygen sensing performances of the resulted composite materials are investigated. Finally, a high sensitivity of 20.1 is realized, with short response/recovery time of 8 s/42 s. Here, sensitivity is defined as the ratio of emission maximum under pure nitrogen to emission minimum under pure oxygen, response and recovery times are the times for a sample to lose (response time) or recover (recovery time) 95% of its emission maximum upon periodically changed atmosphere. © 2012 Elsevier B.V. All rights reserved.

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