Comparison of Functionalized Lithium Dihydrobis(azolyl)borates with Their Corresponding Azolates as Environmentally Friendly Red Pyrotechnic Coloring Agents.,ChemPlusChem

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Comparison of Functionalized Lithium Dihydrobis(azolyl)borates with Their Corresponding Azolates as Environmentally Friendly Red Pyrotechnic Coloring Agents.
ChemPlusChem ( IF 3.0 ) Pub Date : 2020-07-14 , DOI: 10.1002/cplu.202000427
Alicia M W Dufter ₁ , Thomas M Klapötke ₁ , Magdalena Rusan ₁ , Alexander Schweiger ₁ , Jörg Stierstorfer ₁

Affiliation

The recent awareness of the impact of strontium on health has stimulated research efforts on lithium‐based red pyrotechnic colorants. We have previously shown lithium dihydrobis(azolyl)borates to be promising candidates due to their favorable adjustment to a reductive and low‐temperature flame atmosphere. These compounds are assumed to be sufficiently stable only if the pK_a values of the heterocycles are between 5 and 20. Apart from their acidities, functionalization of 1H‐tetrazole and 1H‐pyrazole with nitro or amino groups, respectively, tailors the oxygen balances of the resulting Lewis acid base adducts to enhance the fuel‐rich flame environment or to make them oxidizing agents. This work determines whether the lithium salts of dihydrobis(3‐nitropyrazol‐1‐yl)borate and dihydrobis(5‐aminotetrazol‐1‐yl)borate are suitable replacements for strontium‐containing color imparters. Furthermore, the influence of potentially green‐light‐producing boron is evaluated by comparing the emissions of the lithium borates and the corresponding lithium azolates.

中文翻译：

官能化的二氢双（偶氮基）硼酸锂及其相应的偶氮酸酯作为环境友好型红色烟火着色剂的比较。

最近人们对锶对健康的影响的认识刺激了对锂基红色烟火色料的研究。以前我们已经证明了二氢双（偶氮基）硼酸锂是有希望的候选物，因为它们对还原性和低温火焰气氛具有有利的调节作用。假定这些化合物足够稳定只有当的pK_一个杂环的值是5，并从他们酸度20.除了1个，官能之间ħ四唑和1个ħ分别带有硝基或氨基的吡唑可调节所得路易斯酸碱加合物的氧平衡，以增强燃料丰富的火焰环境或使其成为氧化剂。这项工作确定了二氢双（3-硝基吡唑-1-基）硼酸锂和二氢双（5-氨基四唑-1-基）硼酸锂盐是否适合替代含锶的发色剂。此外，通过比较硼酸锂和相应的偶氮锂的排放来评估可能产生绿色发光的硼的影响。

更新日期：2020-09-10

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