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

IF 1.6 4区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR Transition Metal Chemistry 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

Transition Metal Chemistry 化学-无机化学与核化学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

1.3 months

期刊介绍： Transition Metal Chemistry is an international journal designed to deal with all aspects of the subject embodied in the title: the preparation of transition metal-based molecular compounds of all kinds (including complexes of the Group 12 elements), their structural, physical, kinetic, catalytic and biological properties, their use in chemical synthesis as well as their application in the widest context, their role in naturally occurring systems etc. Manuscripts submitted to the journal should be of broad appeal to the readership and for this reason, papers which are confined to more specialised studies such as the measurement of solution phase equilibria or thermal decomposition studies, or papers which include extensive material on f-block elements, or papers dealing with non-molecular materials, will not normally be considered for publication. Work describing new ligands or coordination geometries must provide sufficient evidence for the confident assignment of structural formulae; this will usually take the form of one or more X-ray crystal structures.