The title compound, 1,12,15 triaza 3,4:9,10 dibenzo 5,8 dioxacyclopentadecane N acetic lactam (C 22 H 29 N 3O 3Br 2, M r =543.29) has been synthesized and characterized by analytical data, IR and 1HNMR spectra. The co...The title compound, 1,12,15 triaza 3,4:9,10 dibenzo 5,8 dioxacyclopentadecane N acetic lactam (C 22 H 29 N 3O 3Br 2, M r =543.29) has been synthesized and characterized by analytical data, IR and 1HNMR spectra. The compound crystallizes in the trigonal system, space group R 3 with a = 35.194(1), c = 10.397(1) , γ=120°, V=11152.6(1) 3, Z=18, D c =1.456 gcm -3 , F(000)=4968, μ =3.3 mm -1 . Mo Kα radiation ( λ = 0.71073), R = 0.0145 for 3094 observed reflections 〔 I>2σ(I )〕 of 3392 independent reflections. The result shows that monofunction reaction for polyaza macrocycle were protonized. 1H NMR spectra of the ligand showed two sets of multiplets due to the two phenyl rings of the ligand in different environments.展开更多
A light and temperature dual responsive copolymer,poly(7-(4-vinylbenzy-loxyl)-4-methylcoumarin-co-N vinyl caprolactam-co-tri(ethylene glycol)methyl ether methacrylate)(PVNM),was grafted on the surface of dopamine base...A light and temperature dual responsive copolymer,poly(7-(4-vinylbenzy-loxyl)-4-methylcoumarin-co-N vinyl caprolactam-co-tri(ethylene glycol)methyl ether methacrylate)(PVNM),was grafted on the surface of dopamine based mesoporous silica nanoparticles(MSNs).The resulting polymer brush,MSNs-g-PVNM,was characterized by FT-IR,TEM,TGA and XPS.The dual responsive behaviors of MSNs-g-PVNM were systematically studied.With imidacloprid as the model guest pesticide,the loading percentage and loading efficiency of the polymer brush were determined as 9.2%and 40.6%,respectively.The release efficiency of imidacloprid in MSNs-g-PVNM was the lowest value of 5.4%at 20℃ and 365 nm,and it reached the highest value of 52.4%at 50℃ and 254 nm.The loss percentage of imidacloprid on the leaves contained imidacloprid-loaded MSNs-g-PVNM(8.4%)was much less than that contained only imidacloprid(25.2%)after three rinses.It was confirmed that the release process of imidacloprid was well regulated through changing external conditions such as light and temperature.展开更多
文摘The title compound, 1,12,15 triaza 3,4:9,10 dibenzo 5,8 dioxacyclopentadecane N acetic lactam (C 22 H 29 N 3O 3Br 2, M r =543.29) has been synthesized and characterized by analytical data, IR and 1HNMR spectra. The compound crystallizes in the trigonal system, space group R 3 with a = 35.194(1), c = 10.397(1) , γ=120°, V=11152.6(1) 3, Z=18, D c =1.456 gcm -3 , F(000)=4968, μ =3.3 mm -1 . Mo Kα radiation ( λ = 0.71073), R = 0.0145 for 3094 observed reflections 〔 I>2σ(I )〕 of 3392 independent reflections. The result shows that monofunction reaction for polyaza macrocycle were protonized. 1H NMR spectra of the ligand showed two sets of multiplets due to the two phenyl rings of the ligand in different environments.
基金Project(21376271)supported by the National Natural Science Foundation of ChinaProject(2016TP1007)supported by the Hunan Provincial Science and Technology Plan Project,ChinaProjects(201810533078,S2020105330395)supported by the Undergraduates Innovative Training Foundation of Central South University,China。
文摘A light and temperature dual responsive copolymer,poly(7-(4-vinylbenzy-loxyl)-4-methylcoumarin-co-N vinyl caprolactam-co-tri(ethylene glycol)methyl ether methacrylate)(PVNM),was grafted on the surface of dopamine based mesoporous silica nanoparticles(MSNs).The resulting polymer brush,MSNs-g-PVNM,was characterized by FT-IR,TEM,TGA and XPS.The dual responsive behaviors of MSNs-g-PVNM were systematically studied.With imidacloprid as the model guest pesticide,the loading percentage and loading efficiency of the polymer brush were determined as 9.2%and 40.6%,respectively.The release efficiency of imidacloprid in MSNs-g-PVNM was the lowest value of 5.4%at 20℃ and 365 nm,and it reached the highest value of 52.4%at 50℃ and 254 nm.The loss percentage of imidacloprid on the leaves contained imidacloprid-loaded MSNs-g-PVNM(8.4%)was much less than that contained only imidacloprid(25.2%)after three rinses.It was confirmed that the release process of imidacloprid was well regulated through changing external conditions such as light and temperature.
