同色铬(II)氨基吡啶甲酸盐:顺式配位与顺式配位

IF 2.7 3区 化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Inorganica Chimica Acta Pub Date : 2024-09-10 DOI:10.1016/j.ica.2024.122371
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引用次数: 0

摘要

通过与两个等量的立体笨重的去质子化 2-氨基吡啶配体 N-(2,4,6-三甲基苯基)-[6-(2,4,6-三甲基苯基)-吡啶-2-基]-胺 (1) 反应,分离出了罕见的同色二价铬配合物、N-(2,6-二异丙基苯基)-[6-(2,6-二甲基苯基)-吡啶-2-基]-胺 (2) 和 N-(2,6-二异丙基苯基)-[6-(2,4,6-三甲基苯基)-吡啶-2-基]-胺 (3)。去质子化的 1 在室温下顺利进行反应,而立体性较强的 2 和 3 则在回流温度下进行反应。相应的双(氨基吡啶甲酸盐)铬配合物(4-6)都是单体,并显示出配位配体的不同方向。化合物 5 有两种异构体。在 4 和 5a 中,两个配体呈头对尾排列,而在 5b 和 6 中,两个配体采用了未知的氨基吡啶配体的头对头排列。所有配合物都显示出围绕铬中心的扭曲正方形平面几何结构。在配体以横向方式配位的 4 和 5a 中,吡啶环和氨基氮原子位于铬的配位平面内。Hirshfeld 分析表明,H∙∙∙H 和 H∙∙∙∙C∙∙∙H π-相互作用是分子间相互作用的主要成分,有时甚至是最强成分。
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Homoleptic chromium(II) aminopyridinates: Transoid vs cisoid coordination

Rare homoleptic divalent chromium complexes have been isolated by reacting two equivalents of sterically bulky deprotonated 2–aminopyridine ligands, N–(2,4,6–trimethylphenyl)–[6–(2,4,6–trimethylphenyl)–pyridine–2–yl]–amine (1), N–(2,6–diisopropylphenyl)–[6–(2,6–dimethylphenyl)–pyridine–2–yl]–amine (2) and N–(2,6–diisopropylphenyl)–[6–(2,4,6–trimethylphenyl)–pyridine–2–yl]–amine (3) with CrCl2 in tetrahydrofuran (THF). Reaction of deprotonated 1 proceeds smoothly at room temperature while that of sterically more bulky 2 and 3 at reflux temperature. The respective bis(aminopyridinate) Cr complexes (46) are monomeric and show different orientations of the coordinated ligands. For compound 5, two isomers were identified. For 4 and 5a the two ligands show head to tail arrangement while in 5b and 6 the two ligands adopt the unknown head to head arrangement of aminopyridinato ligands. All the complexes show distorted square planar geometries around the chromium center. For 4 and 5a in which the ligands are coordinated in transoid manner the pyridine rings and amido nitrogen atom lie in the coordination plane of chromium. Hirshfeld analyses showed that H∙∙∙H and H∙∙∙C/C∙∙∙H π–interactions were the main and at times the strongest contributions for the intermolecular interactions.

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来源期刊
Inorganica Chimica Acta
Inorganica Chimica Acta 化学-无机化学与核化学
CiteScore
6.00
自引率
3.60%
发文量
440
审稿时长
35 days
期刊介绍: Inorganica Chimica Acta is an established international forum for all aspects of advanced Inorganic Chemistry. Original papers of high scientific level and interest are published in the form of Articles and Reviews. Topics covered include: • chemistry of the main group elements and the d- and f-block metals, including the synthesis, characterization and reactivity of coordination, organometallic, biomimetic, supramolecular coordination compounds, including associated computational studies; • synthesis, physico-chemical properties, applications of molecule-based nano-scaled clusters and nanomaterials designed using the principles of coordination chemistry, as well as coordination polymers (CPs), metal-organic frameworks (MOFs), metal-organic polyhedra (MPOs); • reaction mechanisms and physico-chemical investigations computational studies of metalloenzymes and their models; • applications of inorganic compounds, metallodrugs and molecule-based materials. Papers composed primarily of structural reports will typically not be considered for publication.
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