三（2-苯基吡啶）铱（III）在水、乙腈和三氟乙醇中的电致化学发光

Electrogenerated chemiluminescence of tris(2-phenylpyridine)iridium(III) in water, acetonitrile and trifluorethanol.

作者信息

Robinson Wesley D, Richter Mark M

机构信息

Department of Chemistry, Missouri State University, Springfield, MO, USA.

出版信息

Luminescence. 2015 Feb;30(1):67-71. doi: 10.1002/bio.2691. Epub 2014 May 30.

DOI:10.1002/bio.2691

PMID:24890934

Abstract

The spectroscopic, electrochemical and coreactant electrogenerated chemiluminescence (ECL) properties of Ir(ppy)3 (where ppy = 2-phenylpyridine) have been obtained in aqueous buffered (KH2PO4), 50 : 50 (v/v) acetonitrile-aqueous buffered (MeCN-KH2PO4) and 30% trifluoroethanol (TFE) solutions. Tri-n-propylamine was used as the oxidative-reductive ECL coreactant. The photoluminescence (PL) efficiency (ϕem) of Ir(ppy)3 in TFE (ϕem ≈ 0.029) was slightly higher than in 50 : 50 MeCN-KH2PO4 (ϕem ≈ 0.0021) and water (ϕem ≈ 0.00016) compared to a Ru(bpy)32+ standard solution in water (Φem ≈ 0.042). PL and ECL emission spectra were nearly identical in all three solvents, with dual emission maxima at 510 and 530 nm. The similarity between the ECL and PL spectra indicate that the same excited state is probably formed in both experiments. ECL efficiencies (ϕecl) in 30% TFE solution (ϕecl = 0.0098) were higher than aqueous solution (ϕecl = 0.00092) system yet lower than a 50% MeCN-KH2PO4 solution (ϕecl = 0.0091).

摘要

已在水性缓冲（KH₂PO₄）、50:50（v/v）乙腈 - 水性缓冲（MeCN - KH₂PO₄）和30%三氟乙醇（TFE）溶液中获得了Ir(ppy)₃（其中ppy = 2 - 苯基吡啶）的光谱、电化学和共反应物电致化学发光（ECL）性质。三正丙胺用作氧化还原ECL共反应物。与水中的Ru(bpy)₃²⁺标准溶液（Φem≈0.042）相比，Ir(ppy)₃在TFE中的光致发光（PL）效率（ϕem）（ϕem≈0.029）略高于在50:50 MeCN - KH₂PO₄（ϕem≈0.0021）和水中（ϕem≈0.00016）。在所有三种溶剂中，PL和ECL发射光谱几乎相同，在510和530 nm处有双重发射最大值。ECL和PL光谱之间的相似性表明在两个实验中可能形成相同的激发态。30% TFE溶液中的ECL效率（ϕecl）（ϕecl = 0.0098）高于水溶液体系（ϕecl = 0.00092），但低于50% MeCN - KH₂PO₄溶液（ϕecl = 0.0091）。