Pt2Ag acetylide-doped silica nanoparticles: enabling luminescence of Pt2Ag complexes in water and sensors for highly sensitive detection of cyanide anions.
Two novel luminescent hetero-trinuclear complexes [Pt2Ag(μ-dpppy)2(C≡CC6H4R-4)4](ClO4) (R = H, 1; R = CH3, 2; dpppy = 2,6-bis(diphenylphosphino)pyridine) were synthesized by the self-assembly reaction between [Pt(C[triple bond, length as m-dash]CC6H4R-4)4](2-) and [Ag2(μ-dpppy)3](2+) and characterized by elemental analyses, electrospray ionization mass spectrometry, and (1)H NMR and (31)P{(1)H} NMR spectroscopy and by X-ray crystallography for complex 2. Two Pt2Ag complexes show strong luminescence in the solid state, but exhibit weak emission in CH2Cl2 solution and in acetonitrile-water (1 : 1, v : v) solution at room temperature. To overcome the limitations of low water solubility and weak emission in solutions, a new kind of luminescent Pt2Ag@SiO2 nanoparticles was prepared by incorporating the new Pt2Ag acetylides into monodisperse silica nanoparticles. It is noted that Pt2Ag@SiO2 nanoparticles exhibit strong luminescence in aqueous solution, and cyanide anions tend to decrease their luminescence intensity in NaHCO3-NaOH buffer solution. Based on this, a novel nanosensor for highly sensitive detection of cyanide anions was developed in the range of 0.1-10.0 μM.
Ministry of Education Key Lab of Analysis and Detection for Food Safety, Fujian Provincial Key Lab of Analysis and Detection for Food Safety, and College of Chemistry, Fuzhou University, Fuzhou, 350108, China. qhw76@fzu.edu.cn gnchen@fzu.edu.cn.
Xiao-Xia
XX
Lin
Zhi-Hong
ZH
Li
Xiao-Yan
XY
Huang
Yi
Y
Jiang
Qiao-Hua
QH
Wei
Guo-Nan
GN
Chen