In this work, the function of 4-nitroimidazole (4-NIm) in the formation of Cr-MIL-101 was confirmed. It was found that 4-NIm is an effective additive in the formation of Cr-MIL-101 synthesized at lower temperature. The investigation of crystallization time showed that 4-NIm can prevent Cr-MIL-101 phase converting into Cr-MIL-53 phase. The effect of concentration of 4-NIm on the morphology and the yield of Cr-MIL-101 may therefore be explained by increasing the nucleation rate. The investigation of crystallization temperature revealed that 4-NIm changes the synthesis temperature range of Cr-MIL-101 into 423–463 K. The assistant function of 4-NIm was played through interaction with H[Formula: see text] and NO[Formula: see text] in the synthesis system, which may lead to enhancement of the deprotonation of H2BDC.

中文翻译：

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4-硝基咪唑辅助途径合成金属有机骨架 Cr-MIL-101

在这项工作中，证实了 4-硝基咪唑 (4-NIm) 在 Cr-MIL-101 形成中的作用。发现 4-NIm 是在低温下合成 Cr-MIL-101 的有效添加剂。对结晶时间的研究表明，4-NIm 可以防止 Cr-MIL-101 相转变为 Cr-MIL-53 相。因此，4-NIm 浓度对 Cr-MIL-101 的形态和产率的影响可以通过提高成核速率来解释。结晶温度的研究表明，4-NIm 将 Cr-MIL-101 的合成温度范围改变为 423-463 K。4-NIm 的辅助功能是通过与 H[公式：见正文]和 NO[公式：见正文]在合成系统中，这可能会导致H的去质子化增强2BDC。