Synthesis, crystal structures and properties of three sodium coordination polymers based on bridging polyoxometalate ligands

IF 2.7 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Inorganica Chimica Acta Pub Date : 2024-09-13 DOI:10.1016/j.ica.2024.122380

Sudesh M. Morajkar , Delicia A. Barretto , Savita A. Kundaikar

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Abstract

The syntheses, crystal structures, spectral characterization, electrochemical, photoredox properties and biological studies of three sodium coordination polymers viz. (ImH)₄[(µ₂-HMo₇O₂₄)Na(H₂O)₈]∙7H₂O 1 (Im = Imidazole), [(TEAH)Na₅(H₂O)₁₂(µ₅-Mo₇O₂₄)] 2 (TEA=triethanolamine) and [Na₂(PyrH)₂(µ₂-Mo₈O₂₆)(H₂O)₇]∙8H₂O 3 (Pyr = pyrazole) are reported. The unique Na atom in 1 exhibits ten coordination unlike hexa coordination observed in 2 and 3. The µ₂-bridging heptamolybdate (or octamolybdate) anion in 1 (or 3) links the sodium cations into an infinite chain resulting in a one-dimensional coordination polymer. In 2, the heptamolybdate anion exhibits an unprecedented µ₅-nonadentate binding resulting in a three- dimensional (3D) structure. Compounds 1–3 exhibit characteristic Raman bands. Solar irradiation of 2 results in photodimerization, which is further supported by electrochemical studies. Compounds 1–3 exhibit antibacterial activity, with 3 being the most effective against S. Pyogenes, followed by P. aeruginosa, S.typhi and S. aureus. Compound 3 exhibits excellent antidiabetic and anti-inflammatory properties. A comparative study of the binding modes of several heptamolybdates and octamolybdates based compounds is presented.

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基于桥接聚氧化金属配体的三种钠配位聚合物的合成、晶体结构和性质

三种钠配位聚合物的合成、晶体结构、光谱表征、电化学、光氧化性能和生物学研究，即(ImH)4[(µ2-HMo7O24)Na(H2O)8]∙7H2O 1（Im=咪唑）、[(TEAH)Na5(H2O)12(µ5-Mo7O24)] 2（TEA=三乙醇胺）和[Na2(PyrH)2(µ2-Mo8O26)(H2O)7]∙8H2O 3（Pyr=吡唑）。与在 2 和 3 中观察到的六配位不同，1 中唯一的 Na 原子呈现十配位。在 1（或 3）中，μ2 桥接七钼酸盐（或八钼酸盐）阴离子将钠离子连接成无限链，形成一维配位聚合物。在 2 中，七钼酸盐阴离子表现出前所未有的 µ5-nonadentate 结合，形成三维（3D）结构。化合物 1-3 显示出特征性拉曼带。太阳光照射 2 会导致光二聚化，电化学研究进一步证实了这一点。化合物 1-3 具有抗菌活性，其中 3 对化脓性疽杆菌最有效，其次是铜绿假单胞菌、伤寒杆菌和金黄色葡萄球菌。化合物 3 具有出色的抗糖尿病和抗炎特性。本文对几种七钼酸盐和八钼酸盐化合物的结合模式进行了比较研究。

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来源期刊

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.