| Temperature‑Responsive Sensing Emerges from Linker Flexibility in Hydrazide‑Modified MIL‑100(Al) |
| کد مقاله : 1030-ICOC |
| نویسندگان |
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سارا خیرالدین *1، علی مرسلی2 1دانشجوی دکتری دانشگاه تربیت مدرس 2هیئت علمی سرآمد دانشگاه تربیت مدرس |
| چکیده مقاله |
| This work explores how linker flexibility controls temperature‑responsive sensing in hydrazide‑modified MIL‑100(Al). Two functional groups, thiocarbohydrazide (TCH) and carbohydrazide (CH), were incorporated into the framework to tune host–guest interactions with nitroaromatic pollutants such as nitromethane, nitrobenzene, and nitroaniline. The study aims to provide a general understanding of how small changes in linker chemistry influence molecular recognition in MOF‑based nanosensors. Characterization techniques including zeta potential, NMR, XRD, and TGA confirmed the successful post‑synthetic modification and revealed clear structural differences between sulfur‑containing TCH and oxygen‑based CH. Theoretical calculations further showed that TCH exhibits significant rotational freedom at elevated temperatures, while CH remains comparatively rigid. As a result, TCH‑modified MIL‑100(Al) displayed strong sensing performance at room temperature, where limited linker motion favors stable analyte binding. At higher temperatures, however, free rotation of TCH weakened these interactions and reduced sensing efficiency. In contrast, CH maintained more constant performance because its restricted rotation preserved interaction stability. These findings highlight how linker flexibility—governed by heteroatoms such as sulfur—directly shapes the temperature behavior of MOF‑based sensing systems. Overall, this study provides a general nanochemical insight: dynamic linker motion is a key factor determining temperature‑dependent molecular detection in functionalized MOFs. Understanding and controlling this motion can guide the design of next‑generation sensing materials with tunable, stimulus‑responsive properties. |
| کلیدواژه ها |
| Hydrazide functionalization, Linker flexibility, Nitroaromatic detection |
| وضعیت: پذیرفته شده |