Synthesis, structural characterization, and corrosion inhibition properties of rare earth 2-hydroxyphenylacetate coordination polymers

IF 2.7 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Inorganica Chimica Acta Pub Date : 2025-06-02 DOI:10.1016/j.ica.2025.122796

Naveena Y. Salpadoru Thuppahige , Zhifang Guo , Glen B. Deacon , Peter C. Junk

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引用次数: 0

Abstract

The salt metathesis reaction between sodium 2-hydroxyphenylacetate (Na(2hpa)) and a rare earth (RE) metal nitrate or chloride in an aqueous ethanol medium has yielded a series of rare earth one-dimensional (1-D) coordination polymers [La(2hpa)₃(H₂O)₂]_n (1), {[RE₂(2hpa)₆(H₂O)₄]⋅3.5H₂O}_n (RE = Ce (2), Nd (3)), and {[RE₂(2hpa)₆(H₂O)₂]·3H₂O}_n (RE = Gd (4), Dy (5), Y (6), Er (7), Yb (8)) which have three different crystal structures. All structures were determined by single-crystal X-ray diffraction (XRD), except Y (6) and Yb (8) compounds, which were isomorphous with Gd (4), Dy (5), and Er (7) complexes by their unit cell parameters and X-ray powder diffraction (XRPD) patterns. Only the La complex (1) has a mononuclear repeating unit while the others are based on binuclear units. The chelating bridging carboxylate coordination mode is common for all complexes. In addition, complexes 1–3 exhibit the chelating mode with the 10-coordination number whereas complexes 4–8 have syn-syn-bridging bidentate binding with the coordination number of 9. In the weight loss anti-corrosion experiments, the {[Gd₂(2hpa)₆(H₂O)₂]·3H₂O}_n (4) compound demonstrated the highest inhibition efficiency of 57 %. A significant difference between RE 2-hydroxyphenylacetate complexes and [Ce(salH)₃(H₂O)]_n was usually not observed indicating little impact of the -CH₂- unit between carboxylate and benzene ring. The reduced corrosion inhibition efficiencies of RE 2-hydroxyphenylacetate complexes compared with RE 4-hydroxyphenylacetates confirm the positive effect of the p-OH group on the benzene ring on anti-corrosion properties.

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稀土2-羟基苯基乙酸酯配位聚合物的合成、结构表征及缓蚀性能

在乙醇水溶液中，2-羟基苯基乙酸钠（Na(2hpa)）与稀土（RE）金属硝酸盐或氯化物发生盐复分解反应，生成了一系列具有三种不同晶体结构的稀土一维配位聚合物[La(2hpa)3(H2O)2]n(1)、{[RE2(2hpa)6(H2O)4]⋅3.5H2O}n (RE = Ce （2), Nd(3)）和{[RE2(2hpa)6(H2O)2]·3H2O}n (RE = Gd (4), Dy (5), Y (6), Er (7), Yb(8))]。除Y(6)和Yb(8)化合物与Gd(4)、Dy(5)和Er(7)配合物的单晶参数和x射线粉末衍射（XRPD）图均为同晶外，其余结构均采用x射线单晶衍射（XRD）测定。只有La配合物(1)有一个单核重复单元，而其他的都是基于双核重复单元。螯合桥接羧酸盐配位模式在所有配合物中都是常见的。配合物1 ~ 3与配位数为10的配合物呈螯合模式，配合物4 ~ 8与配位数为9的配合物呈同步-同步桥接双齿结合模式。在减重防腐实验中，{[Gd2(2hpa)6(H2O)2]·3H2O}n(4)化合物的缓蚀率最高，为57%。RE -羟基苯基乙酸配合物与[Ce(salH)3(H2O)]n之间通常没有显著差异，表明羧酸盐和苯环之间的- ch2 -单元影响很小。RE - 2-羟基苯基乙酸配合物的缓蚀效率比RE - 4-羟基苯基乙酸配合物的缓蚀效率低，证实了苯环上对羟基对腐蚀性能的积极影响。

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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.