Alkali Blues: Blue-Emissive Alkali Metal Pyrrolates

被引：8

作者：

Back, Oliver ^{[1
]}

Foerster, Christoph ^{[1
]}

Basche, Thomas ^{[2
]}

Heinze, Katja ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Inorgan Chem & Analyt Chem, Duesbergweg 10-14, D-55128 Mainz, Germany

[2] Johannes Gutenberg Univ Mainz, Inst Phys Chem, Duesbergweg 10-14, D-55128 Mainz, Germany

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2019年 / 25卷 / 26期

关键词：

alkali metals; blue emitters; fluorescence; N ligands; rigidification; GAUSSIAN-BASIS SETS; DENSITY FUNCTIONALS; ELECTRON-TRANSFER; SCHIFF-BASE; ATOMS LI; COMPLEXES; FLUORESCENCE; LIGANDS; POLYMERIZATION; MOLYBDENUM;

D O I：

10.1002/chem.201806103

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

2-Iminopyrroles [HtBuL, 4-tert-butyl phenyl(pyrrol-2ylmethylene) amine] are non-fluorescent p systems. However, they display blue fluorescence after deprotonation with alkali metal bases in the solid state and in solution at room temperature. In the solid state, the alkali metal 2-imino pyrrolates, M(L-tBu), aggregate to dimers, [M(L-tBu)(NCR)](2) (M= Li, R= CH3, CH(CH3)CNH2), or polymers, [M(L-tBu)](n) (M= Na, K). In solution (solv= CH3CN, DMSO, THF, and toluene), solvated, uncharged monomeric species M(L-tBu)(solv)(m) with N, N'-che-lated alkali metal ions are present. Due to the electron-rich pyrrolate and the electron-poor arylimino moiety, the M(L-tBu) chromophore possesses a low-energy intraligand chargetransfer (ILCT) excited state. The chelated alkali cations rigidify the chromophore, restricting intramolecular motions (RIM) by the chelation-enhanced fluorescence (CHEF) effect in solution and, consequently, switch-on a blue fluorescence emission.

引用

页码：6542 / 6552

页数：11

共 90 条

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