Synthesis, crystal structure, fluorescence and electrochemical properties of two Ag(I) complexes based on 2-(4′-pyridyl)-benzoxazole/SPPh3 ligands. Issue 20 (18th October 2018)

• Record Type: Journal Article
• Authors: Mao, Shanshan; Han, Xintong; Li, Chuang; Huang, Guozhen; Shen, Kesheng; Shi, Xinkui; Wu, Huilu
• Is Part Of: Journal of coordination chemistry. Volume 71:Issue 20(2018)
• Page Start: 3330
• Page End: 3341
• Publication Date: 2018-10-18
• Subjects: silver(I) complex -- 2-(4′-pyridyl)-benzoxazole -- SPPh3 -- crystal structure -- fluorescence; Coordination compounds -- Periodicals; 541.2242
• DOI: 10.1080/00958972.2018.1514116
• Languages: English
• ISSNs: 0095-8972

Abstract

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 that1 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. In2, 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 that1 results in the fluorescence quenching of aggregates due to the strong π–π stacking effect. The fluorescence enhancement of2 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 of1 and2 indicated an irreversible Ag + /Ag couple. Graphical Abstract: