The potential of environmentally and technically relevant NO₂ for non-innocent ligand behavior in coordination compounds is being evaluated in comparison with the well-studied metal complexes of nitrosyl, NOⁿ (n = +,0,-,2-). A ruthenium semiquinone (Q⁻) radical complex platform [Ru(Q)(L)(NO_x)] (x = 1 or 2, L = mer tridentate ligand) can serve to contrast the ligand characteristics of (NO)ⁿ and (NO₂)ⁿ. Strategies to stabilize metal coordinated nitrogen dioxide (as “nitro” ligand NO₂) versus the well established nitrite NO₂⁻ are suggested.

中文翻译：

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NO和NO ₂作为非纯配体：比较

与经过充分研究的亚硝酰基NO ⁿ（n = +，0，-，2-）金属配合物相比，正在评估与配位化合物中非纯配体行为有关的环境和技术上相关的NO ₂潜力。钌半醌（Q ^- ）基团复合物的平台的[Ru（Q）（L）（NO _X）]（x = 1或2，L = 聚体的三齿配体）可用于对比的配体特性（NO）^ñ和（ NO ₂）ⁿ。策略，以稳定金属协调二氧化氮（如“硝基”配体NO ₂）相对于公认的亚硝酸盐NO ₂ ^-提出了建议。