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Journal of Coordination Chemistry Volume 71, 2018 - Issue 20
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Synthesis, crystal structure, fluorescence and electrochemical properties of two Ag(I) complexes based on 2-(4′-pyridyl)-benzoxazole/SPPh3 ligands

Shanshan MaoSchool of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. ChinaView further author information
,
Xintong HanSchool of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. ChinaView further author information
,
Chuang LiSchool of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. ChinaView further author information
,
Guozhen HuangSchool of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. ChinaView further author information
,
Kesheng ShenSchool of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. ChinaView further author information
,
Xinkui ShiSchool of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. ChinaView further author information
&
Huilu WuSchool of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. ChinaCorrespondence[email protected] [email protected]
View further author information
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Pages 3330-3341 | Received 20 Mar 2018, Accepted 13 Jul 2018, Published online: 10 Oct 2018
 
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Abstract

To explore the luminescence properties of silver complexes in the solid state, two Ag(I) complexes, [Ag(4-PBO)2(NO3)] {di[2-(4′-pyridyl)-benzoxazole]silver(I) nitrate} (1) and [Ag2(SPPh3)4](ClO4)2 {[tetra(triphenylphosphine sulfide)disilver(I)] diperchlorate} (2) (4-PBO =2-(4′-pyridyl)-benzoxazole, SPPh3 = triphenylphosphine sulfide), have been synthesized and characterized by elemental analysis, FT-IR and UV-Vis spectroscopy. Single-crystal X-ray diffraction revealed that 1 is three-coordinate by two nitrogen atoms from two 4-PBO ligands and an oxygen atom from the coordinated nitrate anion forming a triangular plane configuration. In 2, the SPPh3 ligands adopt a monodentate coordinated and monoatomic bridging mode to connect two Ag(I) ions, resulting in a three-coordinate symmetrical binuclear structure. In the solid state, the luminescence properties of the ligands 4-PBO, SPPh3 and their complexes were investigated. The results demonstrated that 1 results in the fluorescence quenching of aggregates due to the strong π–π stacking effect. The fluorescence enhancement of 2 may be attributed to the “aggregation-induced emission” (AIE) effect of restricted intramolecular rotations of the peripheral phenyl rings against the central core. In addition, cyclic voltammograms of 1 and 2 indicated an irreversible Ag+/Ag couple.

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Funding

The present research was supported by the Foundation of A Hundred Youth Talents Training Program of Lanzhou Jiaotong University [grant number 152022]; Natural Science Foundation of Gansu Province [grant number 17JR5RA090]; National Natural Science Foundation of China [grant number 21367017]; The Development of Instrument & Equipment Function and Technical Innovation Project of CAS [grant number 2018gl03].

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