Despite the recent surge of interest in two-dimensional (2D) inorganic nanosheets derived from photoactive coordination polymers of lanthanide ions having interesting optical properties, research in this area is still in its infancy. Luminescent lanthanide ions, Eu(III) or/and Tb(III), as well as a bis-terpyridine ligand (L), were used in this study as the building blocks for the synthesis of the archetypical layered structure of coordination polymers (CPs) (L·Eu/L·Tb). 2D-nanosheets were obtained through exfoliation of the layered precursor of CPs in a suitable solvent system following a sonication-assisted strategy. These nanosheets exhibit lateral sizes on the micrometer scale (0.3–1 μm) and an ultrathin thickness of 2–6.5 nm. 1,1-Diamino-2,2-dinitroethene or FOX-7 is an insensitive high explosive; in a binder mixture, it exhibits a slightly superior detonation velocity of 8870 m s⁻¹ in comparison to RDX. The insensitive nature of FOX-7 makes it a key component for the development of low vulnerable high explosive compositions for further application in weaponry. The growing demand for FOX-7, for use as a suitable replacement of conventional explosives, is of serious concern to human security. Achieving rapid and efficient detection of this unexplored explosive is a challenging task. In the present study, the developed luminescent nanosheets were used for the first time for micromolar level detection of FOX-7 both in solution and in the solid state. A visually distinct color change of the nanosheets from red (L·Eu) and green (L·Tb) to colorless was witnessed upon UV light irradiation during the detection process. Notably, the solid-state detection technique could be exploited for developing a commercial spray kit for quick onsite screening of this important explosive.

中文翻译：

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二维镧系配位聚合物纳米片用于FOX-7的检测

尽管最近对由具有有趣的光学性质的镧系离子的光活性配位聚合物衍生的二维（2D）无机纳米片的兴趣激增，但该领域的研究仍处于起步阶段。发光镧系离子Eu（III）或/和Tb（III）），以及双叔吡啶配体（L），在本研究中用作合成配位聚合物（CP）（L·Eu / L·Tb）的原型层状结构的基础。按照超声辅助策略，通过在合适的溶剂系统中剥离CPs的层状前体，获得2D纳米片。这些纳米片的横向尺寸为微米级（0.3–1μm），超薄厚度为2–6.5 nm。1,1-二氨基-2,2-二硝基乙烯或FOX-7是一种不敏感的高爆炸药。在粘合剂混合物中，其爆震速度略高，为8870 ms ^-1与RDX相比。FOX-7的不敏感特性使其成为开发低脆弱性高爆炸性组合物以进一步应用于武器的关键组成部分。对FOX-7的需求不断增长，以作为传统炸药的适当替代品，这已成为人类安全的严重关切。快速有效地检测这种未探索的炸药是一项艰巨的任务。在本研究中，开发的发光纳米片首次用于溶液和固态中FOX-7的微摩尔水平检测。在检测过程中，用紫外线照射时，可以看到纳米片从红色（L·Eu）和绿色（L·Tb）到无色的视觉上明显的颜色变化。尤其，