Color-change behavior of a bis(benzimidazole)-coordinated nickel-dichlorido complex induced by the adsorption of pyridine or ammonia vapor

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-03-12 DOI:10.1007/s11243-024-00576-9

Tatsunari Murakami, Takahiro Homma, Atsunobu Masuno, Masaaki Okazaki, Shun Ohta

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Abstract

Pyridine (py) and ammonia (NH₃) have been widely used as raw materials in manufacturing processes; however, both are volatile, and their vapor is detrimental to human health. To limit the exposure of those who work with py and NH₃ vapor, the development of effective techniques to sense atmospheric levels of py and NH₃ in order to decrease their concentration when required is important. In the present study, we found that crystals of bis(benzimidazole)NiCl₂ (1, bis(benzimidazole) = phenylbis(benzimidazol-2-yl)methane)) adsorb py and NH₃ vapor with a concomitant color change from purple to green (py) or light purple (NH₃). Powder X-ray diffraction, UV–Vis diffuse reflectance, and IR spectroscopic studies revealed that these color changes are induced by the formation of trans-[NiCl₂(py)₄] (2) or [Ni(NH₃)₆]Cl₂ (3). A time-dependent analysis of the py-vapor adsorption indicated that the formation of 2 from 1 proceeds non-uniformly in the solid. Crystals of 1 were furthermore found to adsorb py or NH₃ even at low concentrations (py: ~ 6 ppm; NH₃: ~ 33 ppm), albeit that a color change was not observed in these cases.

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双（苯并咪唑）配位二氯化镍络合物在吡啶或氨蒸气吸附作用下的变色行为

摘要吡啶（py）和氨（NH3）已被广泛用作生产过程中的原材料，但这两种物质都具有挥发性，其蒸气对人体健康有害。为了限制工作中接触吡和 NH3 蒸汽的人员，必须开发有效的技术来感知大气中吡和 NH3 的浓度水平，以便在需要时降低其浓度。在本研究中，我们发现双（苯并咪唑）NiCl2 晶体（1，双（苯并咪唑）=苯基双（苯并咪唑-2-基）甲烷）能吸附 py 和 NH3 蒸汽，同时颜色从紫色变为绿色（py）或浅紫色（NH3）。粉末 X 射线衍射、紫外可见光漫反射和红外光谱研究表明，这些颜色变化是由反式[NiCl2(py)4]（2）或[Ni(NH3)6]Cl2（3）的形成引起的。对吡蒸气吸附随时间变化的分析表明，固体中 1 形成 2 的过程并不均匀。此外，还发现即使在低浓度下（py：约 6 ppm；NH3：约 33 ppm），1 晶体也能吸附 py 或 NH3，尽管在这些情况下没有观察到颜色变化。图表摘要

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.

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