(E)-3-[1-(2,4-Difluoro­phen­yl)eth­yl]-5-methyl-N-nitro-1,3,5-oxadiazinan-4-imine

The 1,3,5-oxadiazinane ring in the title compound, C12H14F2N4O3, has a conformation inter­mediate between half-chair and screw-boat. The crystal structure is stabilized by weak inter­molecular C—H⋯O hydrogen bonds. Weak π–π inter­actions are indicated by the relatively long centroid–centroid distance of 3.9199 (12) Å and inter­planar distance of 3.803 Å between symmetry-related benzene rings from neighbouring mol­ecules

rac-(E)-3-[1-(2-Chloro­phen­yl)eth­yl]-5-methyl-N-nitro-1,3,5-oxadiazinan-4-imine

In the title compound, C12H15ClN4O3, which has potential insecticidal activity, the oxadiazine ring and the benzene ring make a dihedral angle of 84.63 (2)° to one another. The crystal packing involves weak inter­molecular C—H⋯O hydrogen bonds

Impact of incisions of cataract surgery on patients with corneal astigmatism

AIM: To research the impact of different 3.2mm incisions of cataract surgery on patients whose corneal astigmatism was within 25 degrees by Orbscan. METHODS: We collected 40 cases of cataract patients whose corneal astigmatism was within 25 degrees detected by Orbscan and randomly divided them into groups A, B. Detected by Orbscan, 20 patients(20 eyes)in group A was conducted with 3.2mm corneal astigmatism axial incision and 20 patients(20 eyes)in group B was conducted with 3.2mm corneal incision on 90 degrees of the axis. All cataract operations were implemented by the same physician. We observed the postoperative changes of corneal astigmatism between two groups. RESULTS: The comparisons of Polar K on each time preoperative and postoperative point were significant differences within each group. But the comparisons of Polar K on each time preoperative and postoperative point were not statistically significant between two groups. After 3 months, two kinds of incisions would both increase about 0.3D Polar K in the cornea. CONCLUSION: 3.2mm corneal incision may cause Polar K 0.3D in corneal astigmatism

The Pore Confinement Effect of FDU-12 Mesochannels on MoS 2

FDU-12 silica with highly ordered face-centered cubic mesoporous structure is developed as support to prepare Mo/FDU-12 catalysts for hydrodesulfurization (HDS) of dibenzothiophene (DBT). A series of Mo/FDU-12 catalysts are synthesized by using incipient wetness impregnation method with different MoO3 loadings (6, 8, 10, 12, and 15 wt.%). The objective of this work is to explore the pore confinement effect of FDU-12 mesochannels on the MoS2 morphology with various metal loadings. It is found that, as increasing MoO3 loadings from 6 to 15 wt.%, the MoS2 nanocrystallites transform from monolayer to multilayer and the morphology changes from straight layered to curved and then to ring-like and finally to spherical-like morphology due to the restriction of cage-like pore channels of FDU-12 support. The HDS results show that the catalytic activity increases first and then decreases with the best HDS performance at the MoO3 loading of 10 wt.%. In addition, we compared the HDS activity of Mo catalyst supported on FDU-12 with that on the commercial γ-Al2O3 and SBA-15; the result exhibits that FDU-12 is superior to the other two supports due to its large pore size and ordered three-dimensional open pore channels