Two bis-naphthalimide-based supramolecular gelators (NN-3 and NN-4) with a little difference of position of amino groups were designed and synthesized for the detection of oxaloyl chloride and phosgene. Energy transfer could be occurred between two naphthalimide groups in molecules NN-3 and NN-4. Yellow gels NN-3 and NN-4 were formed in some mixed solvents, and nanofibers with different size were obtained in these gels. The self-assembly processes of NN-3 and NN-4 in different solvents were investigated by UV-vis absorption, fluorescent spectra, SEM, FTIR, XRD and NMR. Gelators NN-3 and NN-4 could selectively detect oxaloyl chloride in solution and film states, but detect phosgene only in solution. NN-3 exhibited the ratiometric detection ability towards oxaloyl chloride and phosgene with the low limit of detection (LOD) of 210 nmol/L and 90 nmol/L, respectively. NN-4 as the corresponding control sample, it owned the higher LOD towards oxaloyl chloride and phosgene of 12.4 µmol/L and 64 µmol/L, respectively. Interestingly, films NN-3 and NN-4 could sensitively detect oxaloyl chloride gases with the low LOD of 2.0 ppm and 8.34 ppm, respectively. The detection mechanisms of NN-3 and NN-4 were well studied by 1H NMR titration, HRMS and theoretical calculation.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |