一种基于吡啶-吡唑的中性 N^N*N^N 配体,可作为多种过渡金属阳离子的四价发色团

IF 3.1 4区 化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Inorganics Pub Date : 2024-01-10 DOI:10.3390/inorganics12010027
Tobias Theiss, María Victoria Cappellari, Jutta Kösters, A. Hepp, C. Strassert
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摘要

本文报告了五种过渡金属配合物的合成、结构和光物理特性,这些配合物含有一种中性吡啶-吡唑基 N^N*N^N 配体(L)作为四价螯合剂。发光体可以通过两种不同的途径合成。为了提高配合物在有机溶剂中的溶解度,在桥接的氮原子上插入了一条带有末端叔丁基分子的烷基链。由于 L 呈中性,可以螯合不同电荷和电子构型的金属离子。因此,我们合成了与 Pt(II) (C1)、Ag(I) (C2)、Zn(II) (C3)、Co(II) (C4) 和 Fe(II) (C5) 的配合物。单晶 X 射线衍射实验表明,与 C3 和 C5 相比,络合物 C2 在结晶状态下表现出完全不同的结构,即取决于螯合阳离子。紫外-可见吸收和核磁共振光谱显示,除了基于铂(II)的配位化合物外,其他配合物在液态溶液中都会解离。因此,我们在固态下研究了配合物和配体的光物理特性。对于基于铂(II)的配位化合物,无论是在稀溶液中还是在固态中,都可以追踪到一种特征性的金属扰动配体中心磷光。
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A Neutral Pyridine-Pyrazole-Based N^N*N^N Ligand as a Tetradentate Chromophore for Diverse Transition Metal Cations
Herein, the synthesis and the structural as well as the photophysical characterization of five transition metal complexes bearing a neutral pyridine-pyrazole-based N^N*N^N ligand (L) acting as a tetradentate chelator are reported. The luminophore can be synthesized via two different pathways. An alkyl chain with a terminal tert-butyl moiety was inserted on the bridging nitrogen atom to enhance the solubility of the complexes in organic solvents. Due to the neutral character of L, metal ions with different charges and electronic configurations can be chelated. Thus, complexes with Pt(II) (C1), Ag(I) (C2), Zn(II) (C3), Co(II) (C4) and Fe(II) (C5) were synthesized. Single-crystal X-ray diffraction experiments showed that complex C2 exhibits a completely different structure in the crystalline state if compared with C3 and C5, i.e., depending on the chelated cation. The UV-vis absorption and the NMR spectra showed that the complexes dissociate in liquid solutions, except for the Pt(II)-based coordination compound. Therefore, the photophysical properties of the complexes and of the ligand were studied in the solid state. For the Pt(II)-based species, a characteristic metal-perturbed ligand-centered phosphorescence was traceable, both in dilute solutions as well as in the solid state.
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来源期刊
Inorganics
Inorganics Chemistry-Inorganic Chemistry
CiteScore
2.80
自引率
10.30%
发文量
193
审稿时长
6 weeks
期刊介绍: Inorganics is an open access journal that covers all aspects of inorganic chemistry research. Topics include but are not limited to: synthesis and characterization of inorganic compounds, complexes and materials structure and bonding in inorganic molecular and solid state compounds spectroscopic, magnetic, physical and chemical properties of inorganic compounds chemical reactivity, physical properties and applications of inorganic compounds and materials mechanisms of inorganic reactions organometallic compounds inorganic cluster chemistry heterogenous and homogeneous catalytic reactions promoted by inorganic compounds thermodynamics and kinetics of significant new and known inorganic compounds supramolecular systems and coordination polymers bio-inorganic chemistry and applications of inorganic compounds in biological systems and medicine environmental and sustainable energy applications of inorganic compounds and materials MD
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