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Mesoporous In2O3 nanocrystals (INS) were successfully prepared using SBA-16 as the template. The sample INS-3, synthesized from a 0.3 M In(NO3)3 solution, had a 7.27 nm mean pore size and 82.32 m2 g−1 specific surface area. The mesoporous In2O3 nanocrystals were interconnected In2O3 small grains (∼5 nm) with a pore wall thickness of about 5–10 nm, and the natural pores provided effective gas adsorption–desorption and fast transportation of carriers, resulting in better diffusivity of the analyte gases. Therefore, the INS-3 sensor exhibited sensing properties with a high response of 158.7 and a low detection limit of 970 ppb to 97 ppm NOx at room temperature (RT), which can be attributed to the synergistic effect between its unique mesoporous and well-crystalline structure. The INS-3 sensor has significant applications for gas sensing. [ABSTRACT FROM AUTHOR]

Four novel new isocoumarins, cajanolactone B, C, D1 and D2 (1-4), were isolated from ethanolic extracts of the leaves of Cajanus cajan . The structural elucidation has been completed mainly depending on extensive spectroscopic analysis including UV, IR, NMR (1D and 2D), HRESIMS and chiral analysis. Notably, all these new isocoumarins were found to exist in racemic forms, among which compounds 3 and 4 share the same planar structure. This finding suggests that at least the biosynthesis of isocoumarin in C. cajan is chiral tolerant. A plausible biogenetic pathway of compounds 1-4 is proposed., Competing Interests: The authors declare no conflict of interest that could have appeared to influence the work reported in this paper., (This journal is © The Royal Society of Chemistry.)